81-803: Pancha Rathas (also known as Five Rathas or Pandava Rathas or Ainthinai kovil) is a monument complex at Mahabalipuram , on the Coromandel Coast of the Bay of Bengal , in the Chengalpattu district of the state of Tamil Nadu , India . Pancha Rathas is an example of monolithic Indian rock-cut architecture . The complex was initially thought to have carved during the reign of King Narasimhavarman I (630–668 CE). However, historians such as Nagaswamy attributed all of monuments in Mahabalipuram to Narasimhavarman II (c. 690–725 CE) with
162-430: A wave shoaling process described below. A tsunami can occur in any tidal state and even at low tide can still inundate coastal areas. On April 1, 1946, the 8.6 M w Aleutian Islands earthquake occurred with a maximum Mercalli intensity of VI ( Strong ). It generated a tsunami which inundated Hilo on the island of Hawaii with a 14-metre high (46 ft) surge. Between 165 and 173 were killed. The area where
243-427: A few minutes at a time. The Tauredunum event was a large tsunami on Lake Geneva in 563 CE, caused by sedimentary deposits destabilised by a landslide. In the 1950s, it was discovered that tsunamis larger than had previously been believed possible can be caused by giant submarine landslides . These large volumes of rapidly displaced water transfer energy at a faster rate than the water can absorb. Their existence
324-432: A huge wave. As the tsunami approaches the coast and the waters become shallow, wave shoaling compresses the wave and its speed decreases below 80 kilometres per hour (50 mph). Its wavelength diminishes to less than 20 kilometres (12 mi) and its amplitude grows enormously—in accord with Green's law . Since the wave still has the same very long period , the tsunami may take minutes to reach full height. Except for
405-541: A large problem of awareness and preparedness, as exemplified by the eruption and collapse of Anak Krakatoa in 2018 , which killed 426 and injured thousands when no warning was available. It is still regarded that lateral landslides and ocean-entering pyroclastic currents are most likely to generate the largest and most hazardous waves from volcanism; however, field investigation of the Tongan event , as well as developments in numerical modelling methods, currently aim to expand
486-538: A massive landslide from Monte Toc entered the reservoir behind the Vajont Dam in Italy. The resulting wave surged over the 262-metre (860 ft)-high dam by 250 metres (820 ft) and destroyed several towns. Around 2,000 people died. Scientists named these waves megatsunamis . Some geologists claim that large landslides from volcanic islands, e.g. Cumbre Vieja on La Palma ( Cumbre Vieja tsunami hazard ) in
567-577: A reference sea level. A large tsunami may feature multiple waves arriving over a period of hours, with significant time between the wave crests. The first wave to reach the shore may not have the highest run-up. About 80% of tsunamis occur in the Pacific Ocean, but they are possible wherever there are large bodies of water, including lakes. However, tsunami interactions with shorelines and the seafloor topography are extremely complex, which leaves some countries more vulnerable than others. For example,
648-462: A ridge and a trough. In the case of a propagating wave like a tsunami, either may be the first to arrive. If the first part to arrive at the shore is the ridge, a massive breaking wave or sudden flooding will be the first effect noticed on land. However, if the first part to arrive is a trough, a drawback will occur as the shoreline recedes dramatically, exposing normally submerged areas. The drawback can exceed hundreds of metres, and people unaware of
729-467: A significant tsunami, such as the 1977 Sumba and 1933 Sanriku events. Tsunamis have a small wave height offshore, and a very long wavelength (often hundreds of kilometres long, whereas normal ocean waves have a wavelength of only 30 or 40 metres), which is why they generally pass unnoticed at sea, forming only a slight swell usually about 300 millimetres (12 in) above the normal sea surface. They grow in height when they reach shallower water, in
810-601: A slight incline. Though sometimes mistakenly referred to as temples , the structures were never consecrated because they were never completed following the death of Narasimhavarman I. The structures are named after the Pancha Pandavas and their common wife Draupadi , of epic Mahabharata fame. In order of their size, they include the Dharmaraja Ratha , Bhima Ratha , Arjuna Ratha , Nakula Sahadeva Ratha , and Draupadi Ratha . The monoliths are named after
891-542: A slight slope. Each has a different layout, such as square, rectangular, or apsidal plans. The largest measures 42 by 35 feet (13 m × 11 m), and the tallest is 40 feet (12 m) high. The Pancha rathas represent the diversity of Dravidian architecture of the time and it is likely that their original design traces back to wood constructions of temple chariots and were scale models or templates for much bigger temples built subsequently in Tamil Nadu. Most of
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#1732775532047972-655: A transoceanic tsunami has not occurred within recorded history. Susceptible locations are believed to be the Big Island of Hawaii , Fogo in the Cape Verde Islands , La Reunion in the Indian Ocean , and Cumbre Vieja on the island of La Palma in the Canary Islands ; along with other volcanic ocean islands. This is because large masses of relatively unconsolidated volcanic material occurs on
1053-445: A tsunami can be calculated by obtaining the square root of the depth of the water in metres multiplied by the acceleration due to gravity (approximated to 10 m/s ). For example, if the Pacific Ocean is considered to have a depth of 5000 metres, the velocity of a tsunami would be √ 5000 × 10 = √ 50000 ≈ 224 metres per second (730 ft/s), which equates to a speed of about 806 kilometres per hour (501 mph). This
1134-434: A tsunami can be generated when thrust faults associated with convergent or destructive plate boundaries move abruptly, resulting in water displacement, owing to the vertical component of movement involved. Movement on normal (extensional) faults can also cause displacement of the seabed, but only the largest of such events (typically related to flexure in the outer trench swell ) cause enough displacement to give rise to
1215-473: A tsunami, which is that of an extraordinarily high tidal bore . Tsunamis and tides both produce waves of water that move inland, but in the case of a tsunami, the inland movement of water may be much greater, giving the impression of an incredibly high and forceful tide. In recent years, the term "tidal wave" has fallen out of favour, especially in the scientific community, because the causes of tsunamis have nothing to do with those of tides , which are produced by
1296-448: Is 56 km from Chennai. Mahabalipuram has a tropical wet and dry climate . The Köppen-Geiger climate classification is Aw. The average annual temperature is 28.4 °C. The temperatures are highest on average in May, at around 32.6 °C. In January, the average temperature is 24.3 °C, the lowest of the year. The average temperatures vary during the year by 8.3 °C. In a year,
1377-467: Is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake . Earthquakes , volcanic eruptions and underwater explosions (including detonations, landslides , glacier calvings , meteorite impacts and other disturbances) above or below water all have the potential to generate a tsunami. Unlike normal ocean waves, which are generated by wind , or tides , which are in turn generated by
1458-620: Is also accustomed to tsunamis, with earthquakes of varying magnitudes regularly occurring off the coast of the island. Tsunamis are an often underestimated hazard in the Mediterranean Sea and parts of Europe. Of historical and current (with regard to risk assumptions) importance are the 1755 Lisbon earthquake and tsunami (which was caused by the Azores–Gibraltar Transform Fault ), the 1783 Calabrian earthquakes , each causing several tens of thousands of deaths and
1539-562: Is also used to refer to the phenomenon because the waves most often are generated by seismic activity such as earthquakes. Prior to the rise of the use of the term tsunami in English, scientists generally encouraged the use of the term seismic sea wave rather than tidal wave . However, like tidal wave , seismic sea wave is not a completely accurate term, as forces other than earthquakes—including underwater landslides , volcanic eruptions, underwater explosions, land or ice slumping into
1620-421: Is approximately 35 miles (56 km) south of Chennai (previously known as Madras), the capital city, while Chengalpattu is about 20 miles (32 km) distant. The structures are part of the nine monolithic rock cut structures seen here. Each of the five rathas is a monolith , carved whole from a rock outcropping of pink granite. They are carved over a common mounted plinth which is north–south oriented with
1701-454: Is built with a square layout. Its composition has been accentuated with carvings of Hindu gods Harihara , Brahma , Skanda , Ardhanarishvara and King Narasimhavarman I. One of the distinctive carvings seen on the eastern face of the ratha is of Indra (a demi-god of rain and thunderstorms), seated on his mount Airavata (meaning: "a White Elephant"). There is also an independent monolithic stone sculpture of Nandi , adjoining this ratha in
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#17327755320471782-496: Is designed to help accurately forecast the passage of tsunamis across oceans as well as how tsunami waves interact with shorelines. The term "tsunami" is a borrowing from the Japanese tsunami 津波 , meaning "harbour wave." For the plural, one can either follow ordinary English practice and add an s , or use an invariable plural as in the Japanese. Some English speakers alter the word's initial / ts / to an / s / by dropping
1863-410: Is fixed in the open space, next to this ratha. The Draupadi Ratha , which is the last in the line, is a square structure, which resembles a village hut with thatch roof. The fresco inside this shrine is of mother goddess Durga . Mahabalipuram Mamallapuram (also known as Mahabalipuram ), is a town in Chengalpattu district in the southeastern Indian state of Tamil Nadu , best known for
1944-515: Is not favoured by the scientific community because it might give the false impression of a causal relationship between tides and tsunamis. Tsunamis generally consist of a series of waves, with periods ranging from minutes to hours, arriving in a so-called " wave train ". Wave heights of tens of metres can be generated by large events. Although the impact of tsunamis is limited to coastal areas, their destructive power can be enormous, and they can affect entire ocean basins. The 2004 Indian Ocean tsunami
2025-791: Is now Shakespear Regional Park at the tip of the Whangaparāoa Peninsula in the Auckland Region of New Zealand ; the attempt failed. There has been considerable speculation about the possibility of using nuclear weapons to cause tsunamis near an enemy coastline. Nuclear testing in the Pacific Proving Ground by the United States generated poor results. In Operation Crossroads in July 1946, two 20-kilotonne-of-TNT (84 TJ) bombs were detonated, one in
2106-426: Is the formula used for calculating the velocity of shallow-water waves. Even the deep ocean is shallow in this sense because a tsunami wave is so long (horizontally from crest to crest) by comparison. The reason for the Japanese name "harbour wave" is that sometimes a village's fishermen would sail out, and encounter no unusual waves while out at sea fishing, and come back to land to find their village devastated by
2187-430: The 1883 eruption of Krakatoa , and the 2022 Hunga Tonga–Hunga Ha'apai eruption . Over 20% of all fatalities caused by volcanism during the past 250 years are estimated to have been caused by volcanogenic tsunamis. Debate has persisted over the origins and source mechanisms of these types of tsunamis, such as those generated by Krakatoa in 1883, and they remain lesser understood than their seismic relatives. This poses
2268-688: The 1908 Messina earthquake and tsunami. The tsunami claimed more than 123,000 lives in Sicily and Calabria and is among the deadliest natural disasters in modern Europe. The Storegga Slide in the Norwegian Sea and some examples of tsunamis affecting the British Isles refer to landslide and meteotsunamis , predominantly and less to earthquake-induced waves. As early as 426 BC the Greek historian Thucydides inquired in his book History of
2349-413: The Canary Islands , may be able to generate megatsunamis that can cross oceans, but this is disputed by many others. In general, landslides generate displacements mainly in the shallower parts of the coastline, and there is conjecture about the nature of large landslides that enter the water. This has been shown to subsequently affect water in enclosed bays and lakes, but a landslide large enough to cause
2430-552: The Pallava Period . The site is managed by the Archaeological Survey of India . Some important structures include: As of 2001 India census, Mahabalipuram had a population of 12,345. Males constitute 52% of the population and females 48%. Mahabalipuram has an average literacy rate of 74%, higher than the national average of 73%: male literacy is 82%, and female literacy is 66%. In Mahabalipuram, 12% of
2511-530: The gravitational pull of the Moon and the Sun , a tsunami is generated by the displacement of water from a large event. Tsunami waves do not resemble normal undersea currents or sea waves because their wavelength is far longer. Rather than appearing as a breaking wave , a tsunami may instead initially resemble a rapidly rising tide . For this reason, it is often referred to as a tidal wave , although this usage
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2592-427: The "t," since English does not natively permit /ts/ at the beginning of words, though the original Japanese pronunciation is /ts/ . The term has become commonly accepted in English, although its literal Japanese meaning is not necessarily descriptive of the waves, which do not occur only in harbours. Tsunamis are sometimes referred to as tidal waves . This once-popular term derives from the most common appearance of
2673-614: The 4th century CE have been found at Mahabalipuram revealing the port as an active hub of global trade in the late classical period. Two Pallava coins bearing legends read as Srihari and Srinidhi have been found at Mahabalipuram. The Pallava kings ruled Mahabalipuram from Kanchipuram ; the capital of the Pallava dynasty from the 3rd century to 9th century CE, and used the port to launch trade and diplomatic missions to Sri Lanka and Southeast Asia. An 8th-century Tamil text written by Thirumangai Alvar described this place as Sea Mountain 'where
2754-843: The Ganges or Arjuna's Penance – one of the largest open-air rock relief in the world. The site includes several categories of monuments: ratha temples with an architecture of monolith processional chariots built between 630 and 668 CE; the mandapa viharas with halls and stone roofs with narratives from the Mahabharata , Shaktism and Vaishnavism ; rock reliefs particularly bas-reliefs of Shaivism , Shaktism and Vaishnavism; stone cut temples particularly those dedicated to Shiva that also reverentially display Vishnu and others, built between 695 and 722 CE; and, archaeological excavations with inscriptions some dated to 6th century and earlier. The cave temples and monolithic temples were built during
2835-531: The Government College of Architecture and Sculpture was established to promote and revive the art of making sculptures and temples. MTC and TNSTC (Villupuram division) operate bus services between Mamallapuram/Mahabalipuram and Chennai, Chengalpattu, Kancheepuram, Thiruttani etc. MTC's bus services available from various parts of the Chennai include Deluxe and Air-conditioned buses. Mahabalipuram
2916-818: The Great Lakes, the Aegean Sea, the English Channel, and the Balearic Islands, where they are common enough to have a local name, rissaga . In Sicily they are called marubbio and in Nagasaki Bay, they are called abiki . Some examples of destructive meteotsunamis include 31 March 1979 at Nagasaki and 15 June 2006 at Menorca, the latter causing damage in the tens of millions of euros. Meteotsunamis should not be confused with storm surges , which are local increases in sea level associated with
2997-540: The Pacific coasts of the United States and Mexico lie adjacent to each other, but the United States has recorded ten tsunamis in the region since 1788, while Mexico has recorded twenty-five since 1732. Similarly, Japan has had more than a hundred tsunamis in recorded history, while the neighbouring island of Taiwan has registered only two, in 1781 and 1867. All waves have a positive and negative peak; that is,
3078-539: The Pandavas – Arjuna , Bhima , Yudhishthira ("Dharmaraja"), Nakula and Sahadeva – and Draupadi . These names are considered to be a misrepresentation as the structures have no link to the iconic characters of the Mahabharata epic. They have no religious significance either, as they remained unfinished and unconsecrated; the uncut rock parts at the base and top of the rathas are still visible. The ASI confirmed
3159-597: The Peloponnesian War about the causes of tsunami, and was the first to argue that ocean earthquakes must be the cause. The oldest human record of a tsunami dates back to 479 BC , in the Greek colony of Potidaea , thought to be triggered by an earthquake. The tsunami may have saved the colony from an invasion by the Achaemenid Empire . The cause, in my opinion, of this phenomenon must be sought in
3240-606: The UNESCO World Heritage Site of 7th- and 8th-century Hindu Group of Monuments at Mahabalipuram . It is one of the famous tourist sites in India. The ancient name of the place is Thirukadalmallai. It is a part of Chennai Metropolitan Area . It is a satellite town of Chennai . Mamallapuram was one of two major port cities in the Pallava kingdom . The town was named after Pallava king Narasimhavarman I , who
3321-450: The air over and one underwater within the shallow waters of the 50-metre (164 ft) deep lagoon at Bikini Atoll . The bombs detonated about 6 km (3.7 mi; 3.2 nmi) from the nearest island, where the waves were no higher than 3 to 4 m (9.8 to 13.1 ft) when they reached the shoreline. Other underwater tests, mainly Operation Hardtack I /Wahoo in deep water and Operation Hardtack I/Umbrella in shallow water, confirmed
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3402-490: The appearance of a set of shallow pilasters. The niches created in the walls are of rectangular shape and have carved sculptures of gods, demi-gods and the kings. The skirting around the images are of wild aquatic animals with "foliated tails and open jaws." The wall pilasters have curved brackets, and columns on the porch provide support to an overhanging eave; arch windows occasionally carved with images are located above them. The mouldings culminate in parapets. The carvings above
3483-579: The average rainfall is 1219 mm. In winter, there is much less rainfall than in summer. The variation in the precipitation between the driest and wettest months is 309 mm. The town has a collection of 7th- and 8th-century Hindu religious monuments that has been declared as a UNESCO World Heritage Site . It is on the Coromandel Coast of the Bay of Bengal, about 60 kilometres (37 mi) south of Chennai , Tamil Nadu , India . The site has 40 ancient monuments and Hindu temples , including Descent of
3564-413: The danger sometimes remain near the shore to satisfy their curiosity or to collect fish from the exposed seabed. A typical wave period for a damaging tsunami is about twelve minutes. Thus, the sea recedes in the drawback phase, with areas well below sea level exposed after three minutes. For the next six minutes, the wave trough builds into a ridge which may flood the coast, and destruction ensues. During
3645-455: The deep ocean has a much larger wavelength of up to 200 kilometres (120 mi). Such a wave travels at well over 800 kilometres per hour (500 mph), but owing to the enormous wavelength the wave oscillation at any given point takes 20 or 30 minutes to complete a cycle and has an amplitude of only about 1 metre (3.3 ft). This makes tsunamis difficult to detect over deep water, where ships are unable to feel their passage. The velocity of
3726-577: The discovery of new inscriptions. The complex is under the auspices of the Archaeological Survey of India (ASI) and is part of the UNESCO World Heritage Site inscribed by UNESCO in 1984 as Group of Monuments at Mahabalipuram . Each of the five monuments in the Pancha Rathas complex resembles a chariot ( ratha ), and each is carved over a single, long stone or monolith, of granite which slopes in north–south direction with
3807-494: The earthquake occurred is where the Pacific Ocean floor is subducting (or being pushed downwards) under Alaska. Examples of tsunamis originating at locations away from convergent boundaries include Storegga about 8,000 years ago, Grand Banks in 1929, and Papua New Guinea in 1998 (Tappin, 2001). The Grand Banks and Papua New Guinea tsunamis came from earthquakes which destabilised sediments, causing them to flow into
3888-408: The earthquake. At the point where its shock has been the most violent the sea is driven back, and suddenly recoiling with redoubled force, causes the inundation. Without an earthquake I do not see how such an accident could happen. The Roman historian Ammianus Marcellinus ( Res Gestae 26.10.15–19) described the typical sequence of a tsunami, including an incipient earthquake, the sudden retreat of
3969-450: The eave overhangs are decorated roof forms in miniature size, which are seen in rows all round each of the structure. The rathas have been preserved well on account of the sturdiness of their material, granite, and in spite of constant salty winds from the Bay of Bengal and catastrophic tsunamis in the 13th century AD and in 2004. The architectural elegance of the Dharmaraja Ratha is its pyramidal structure which rises in three steps. It
4050-564: The famous Pallava Emperor Narasimhavarman I (630-670 CE) who built the famous temples in the city. Thirumangai Alvar , the famous Vaishnavite saint mentions this place as Thirukadalmallai, referring to the Sthalasayana Perumal Temple . Another name by which Mahabalipuram has been known to mariners, at least since Marco Polo 's time is "Seven Pagodas" alluding to the Seven Pagodas of Mahabalipuram that stood on
4131-406: The flanks and in some cases detachment planes are believed to be developing. However, there is growing controversy about how dangerous these slopes actually are. Other than by landslides or sector collapse , volcanoes may be able to generate waves by pyroclastic flow submergence, caldera collapse, or underwater explosions. Tsunamis have been triggered by a number of volcanic eruptions, including
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#17327755320474212-494: The gravitational pull of the moon and sun rather than the displacement of water. Although the meanings of "tidal" include "resembling" or "having the form or character of" tides, use of the term tidal wave is discouraged by geologists and oceanographers. A 1969 episode of the TV crime show Hawaii Five-O entitled "Forty Feet High and It Kills!" used the terms "tsunami" and "tidal wave" interchangeably. The term seismic sea wave
4293-409: The harbour at Halifax , Nova Scotia , Canada . There have been studies of the potential for the use of explosives to induce tsunamis as a tectonic weapon . As early as World War II (1939–1945), consideration of the use of conventional explosives was explored, and New Zealand's military forces initiated Project Seal , which attempted to create small tsunamis with explosives in the area of what
4374-557: The intensity of tsunamis were the Sieberg - Ambraseys scale (1962), used in the Mediterranean Sea and the Imamura-Iida intensity scale (1963), used in the Pacific Ocean. The latter scale was modified by Soloviev (1972), who calculated the tsunami intensity " I " according to the formula: where H a v {\displaystyle {\mathit {H}}_{av}} is the "tsunami height" in metres, averaged along
4455-562: The intensively studied tsunamis in 2004 and 2011, a new 12-point scale was proposed, the Integrated Tsunami Intensity Scale (ITIS-2012), intended to match as closely as possible to the modified ESI2007 and EMS earthquake intensity scales. The first scale that genuinely calculated a magnitude for a tsunami, rather than an intensity at a particular location was the ML scale proposed by Murty & Loomis based on
4536-483: The low barometric pressure of passing tropical cyclones, nor should they be confused with setup, the temporary local raising of sea level caused by strong on-shore winds. Storm surges and setup are also dangerous causes of coastal flooding in severe weather but their dynamics are completely unrelated to tsunami waves. They are unable to propagate beyond their sources, as waves do. The accidental Halifax Explosion in 1917 triggered an 18-metre (59 ft) high tsunami in
4617-636: The nearest coastline, with the tsunami height defined as the rise of the water level above the normal tidal level at the time of occurrence of the tsunami. This scale, known as the Soloviev-Imamura tsunami intensity scale , is used in the global tsunami catalogues compiled by the NGDC/NOAA and the Novosibirsk Tsunami Laboratory as the main parameter for the size of the tsunami. This formula yields: In 2013, following
4698-405: The next six minutes, the wave changes from a ridge to a trough, and the flood waters recede in a second drawback. Victims and debris may be swept into the ocean. The process repeats with succeeding waves. As with earthquakes, several attempts have been made to set up scales of tsunami intensity or magnitude to allow comparison between different events. The first scales used routinely to measure
4779-856: The ocean and generate a tsunami. They dissipated before travelling transoceanic distances. The cause of the Storegga sediment failure is unknown. Possibilities include an overloading of the sediments, an earthquake or a release of gas hydrates (methane etc.). The 1960 Valdivia earthquake ( M w 9.5), 1964 Alaska earthquake ( M w 9.2), 2004 Indian Ocean earthquake ( M w 9.2), and 2011 Tōhoku earthquake ( M w 9.0) are recent examples of powerful megathrust earthquakes that generated tsunamis (known as teletsunamis ) that can cross entire oceans. Smaller ( M w 4.2) earthquakes in Japan can trigger tsunamis (called local and regional tsunamis) that can devastate stretches of coastline, but can do so in only
4860-437: The ocean, meteorite impacts, and the weather when the atmospheric pressure changes very rapidly—can generate such waves by displacing water. The use of the term tsunami for waves created by landslides entering bodies of water has become internationally widespread in both scientific and popular literature, although such waves are distinct in origin from large waves generated by earthquakes. This distinction sometimes leads to
4941-632: The open space. The next in order is the Arjuna Ratha , which is well decorated with an elegant façade and is akin to the Dharmaraja Ratha. Next in line is the Bhima Ratha built to a rectangular plan and with lion mounted columned (four columns) galleries on both long sides. The Nakula Sahadeva Ratha is the next in line. It is built to a simple plan with no embellishing carvings in its apses. A stone monolithic sculpture of an elephant
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#17327755320475022-572: The population is under 6 years of age. In October 2019, Indian Prime Minister Narendra Modi and Chinese President Xi Jinping visited Arjuna's Penance, the Pancha Rathas complex and the Shore Temple in Mahabalipuram. Tsunami A tsunami ( /( t ) s uː ˈ n ɑː m i , ( t ) s ʊ ˈ -/ (t)soo- NAH -mee, (t)suu- ; from Japanese : 津波 , lit. 'harbour wave', pronounced [tsɯnami] )
5103-482: The possibility of a meteorite causing a tsunami is debated. Tsunamis can be generated when the sea floor abruptly deforms and vertically displaces the overlying water. Tectonic earthquakes are a particular kind of earthquake that are associated with the Earth's crustal deformation; when these earthquakes occur beneath the sea, the water above the deformed area is displaced from its equilibrium position. More specifically,
5184-433: The potential energy. Difficulties in calculating the potential energy of the tsunami mean that this scale is rarely used. Abe introduced the tsunami magnitude scale M t {\displaystyle {\mathit {M}}_{t}} , calculated from, where h is the maximum tsunami-wave amplitude (in m) measured by a tide gauge at a distance R from the epicentre, a , b and D are constants used to make
5265-522: The rathas are stated to be modelled on the Buddhist Viharas and Chaityas. The structural design and elevation are with towers or domes with single (ekathala) to triple (trithala) towers, which present a unique exhibition of South Indian Dravidian architecture. The chiseling done by the stone sculptors are occasional along joints between the stones. The walls are arranged and sequentially partitioned. The projections and recesses in these walls give
5346-605: The results. Analysis of the effects of shallow and deep underwater explosions indicate that the energy of the explosions does not easily generate the kind of deep, all-ocean waveforms typical of tsunamis because most of the energy creates steam , causes vertical fountains above the water, and creates compressional waveforms. Tsunamis are hallmarked by permanent large vertical displacements of very large volumes of water which do not occur in explosions. Tsunamis are caused by earthquakes, landslides, volcanic explosions, glacier calvings, and bolides . They cause damage by two mechanisms:
5427-426: The sea and a following gigantic wave, after the 365 AD tsunami devastated Alexandria . The principal generation mechanism of a tsunami is the displacement of a substantial volume of water or perturbation of the sea. This displacement of water is usually caused by earthquakes, but can also be attributed to landslides, volcanic eruptions, glacier calvings or more rarely by meteorites and nuclear tests. However,
5508-484: The ships rode at anchor bent to the point of breaking laden as they were with wealth, big trunked elephants and gems of nine varieties in heaps'. The temples of Mahabalipuram, portraying events described in the Mahabharata , were built largely during the reigns of King Narasimhavarman and his successor Rajasimhavarman and show the movement from rock-cut architecture to structural building. The city of Mahabalipuram
5589-563: The shore, of which one, the Shore Temple , survives. Neolithic burial urn, cairn circles and jars with burials dating to the 1st century BCE have been discovered near Mahabalipuram. The Sangam age poem Perumpāṇāṟṟuppadai relates the rule of King Thondaiman Ilam Thiraiyar at Kanchipuram of the Tondai Nadu port Nirppeyyaru which scholars identify with the present-day Mahabalipuram. Chinese coins and Roman coins of Theodosius I in
5670-400: The smashing force of a wall of water travelling at high speed, and the destructive power of a large volume of water draining off the land and carrying a large amount of debris with it, even with waves that do not appear to be large. While everyday wind waves have a wavelength (from crest to crest) of about 100 metres (330 ft) and a height of roughly 2 metres (6.6 ft), a tsunami in
5751-457: The transoceanic reach of significant seismic tsunamis, and 2) that the force that displaces the water is sustained over some length of time such that meteotsunamis cannot be modelled as having been caused instantaneously. In spite of their lower energies, on shorelines where they can be amplified by resonance, they are sometimes powerful enough to cause localised damage and potential for loss of life. They have been documented in many places, including
5832-447: The understanding of the other source mechanisms. Some meteorological conditions, especially rapid changes in barometric pressure, as seen with the passing of a front, can displace bodies of water enough to cause trains of waves with wavelengths. These are comparable to seismic tsunamis, but usually with lower energies. Essentially, they are dynamically equivalent to seismic tsunamis, the only differences being 1) that meteotsunamis lack
5913-571: The unfinished nature of the structures and suggested that they instead be referred to as vimanas . However, the Pandava names have become permanent. According to a plaque displayed at the site by the ASI, the Pallava dynasty had planned the structures as models of chariots in rock based on prototypes of ancient rathas built in wood. The Pancha Rathas were carved during the reign of King Mahendravarman I and his son Narasimhavarman I. Work on these five rathas
5994-457: The use of other terms for landslide-generated waves, including landslide-triggered tsunami , displacement wave , non-seismic wave , impact wave , and, simply, giant wave . While Japan may have the longest recorded history of tsunamis, the sheer destruction caused by the 2004 Indian Ocean earthquake and tsunami event mark it as the most devastating of its kind in modern times, killing around 230,000 people. The Sumatran region
6075-399: The very largest tsunamis, the approaching wave does not break , but rather appears like a fast-moving tidal bore . Open bays and coastlines adjacent to very deep water may shape the tsunami further into a step-like wave with a steep-breaking front. When the tsunami's wave peak reaches the shore, the resulting temporary rise in sea level is termed run up . Run up is measured in metres above
6156-456: Was also known as Mamalla. Along with economic prosperity, it became the site of a group of royal monuments, many carved out of the living rock. These are dated to the 7th and 8th centuries: rathas (temples in the form of chariots), mandapas (cave sanctuaries), the giant open-air rock relief the Descent of the Ganges , and the Shore Temple dedicated to Shiva . The contemporary town plan
6237-576: Was among the deadliest natural disasters in human history, with at least 230,000 people killed or missing in 14 countries bordering the Indian Ocean . The Ancient Greek historian Thucydides suggested in his 5th century BC History of the Peloponnesian War that tsunamis were related to submarine earthquakes , but the understanding of tsunamis remained slim until the 20th century, and much remains unknown. Major areas of current research include determining why some large earthquakes do not generate tsunamis while other smaller ones do. This ongoing research
6318-521: Was confirmed in 1958, when a giant landslide in Lituya Bay , Alaska, caused the highest wave ever recorded, which had a height of 524 metres (1,719 ft). The wave did not travel far as it struck land almost immediately. The wave struck three boats—each with two people aboard—anchored in the bay. One boat rode out the wave, but the wave sank the other two, killing both people aboard one of them. Another landslide-tsunami event occurred in 1963 when
6399-617: Was discontinued following the death of Narasimha Varman in 668 AD. The purpose of their construction is not known as the structures were not completed. Part of the collection within the Group of Monuments at Mahabalipuram , they were classified as a UNESCO World Heritage Site in 1984. The site is located at Mahabalipuram (previously known as Mammallapuram), on the Coromandel Coast of the Bay of Bengal, in Kancheepuram district. It
6480-525: Was established by the British Raj in 1827. The earliest mention of the city is found in the 1st century work called Periplus of the Erythraean Sea by an unknown Greek navigator. Ptolemy , the Greek geographer refers this place as Malange. Mahabalipuram is also known by other names such as Mamallapattana and Mamallapuram. The term Mamallapuram means the city of Mamalla, the other name of
6561-524: Was founded by the Pallava king Narasimhavarman I in the 7th century CE. The mandapa or pavilions and the rathas or shrines shaped as temple chariots are hewn from the granite rock face, while the famed Shore Temple , erected half a century later, is built from dressed stone. What makes Mahabalipuram so culturally resonant are the influences it absorbs and disseminates. The Shore Temple includes many reliefs, including one 100 feet (30 m) long and 45 feet (14 m) high, carved out of granite. In 1957
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