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50-518: The range lies in an east–west direction directly west of the desert town of Ridgecrest , and southeast of the Kern River Valley and Lake Isabella . The mountain range reaches an elevation of 7,096 feet (2,163 m) above sea level at Cathie's Peak. The range was named by the U.S. Forest Service for William Scodie, who established "Scodie's Store" (ca.1860) at the mouth of what is now named Scodie Canyon. The Scodie Mountains are home to

100-490: A National Historic Landmark in 1964. In 2001, they were incorporated into a larger National Historic Landmark District , called Coso Rock Art District. In 2014, the Ridgecrest Petroglyph Festival , a celebration of the petroglyphs, native culture, and Ridgecrest as a California tourist destination was created as an annual event. It was named as one of Groupon 's "10 Most Unique Autumn Festivals in

150-468: A magnitude 5.4 quake, centered 18 kilometers (11 mi) north of the town of Ridgecrest, shook the area and spawned over 2,500 aftershocks over the course of the following five weeks. Then, on September 20, 1995, the second large quake struck the area: it measured magnitude 5.8, and was at that time the largest earthquake to hit southern California since the 1994 Northridge earthquake . Between July 4 and 5, 2019, Ridgecrest, California, experienced

200-432: A consistent pattern . In some earthquakes the main rupture happens in two or more steps, resulting in multiple main shocks. These are known as doublet earthquakes , and in general can be distinguished from aftershocks in having similar magnitudes and nearly identical seismic waveforms . Most aftershocks are located over the full area of fault rupture and either occur along the fault plane itself or along other faults within

250-480: A dependence on space and a dependence on time. And more recently, through the application of a fractional solution of the reactive differential equation, a double power law model shows the number density decay in several possible ways, among which is a particular case the Utsu-Omori Law. The other main law describing aftershocks is known as Båth's Law and this states that the difference in magnitude between

300-469: A female householder with no husband present, and 31.9% were non-families. 27.6% of all households were made up of individuals, and 8.6% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 3.06. In the city, the population was spread out, with 29.1% under the age of 18, 8.5% from 18 to 24, 28.1% from 25 to 44, 23.0% from 45 to 64, and 11.3% who were 65 years of age or older. The median age

350-485: A large magnitude, and can collapse buildings that are damaged from the main shock. Bigger earthquakes have more and larger aftershocks and the sequences can last for years or even longer especially when a large event occurs in a seismically quiet area; see, for example, the New Madrid seismic zone , where events still follow Omori's law from the main shocks of 1811–1812. An aftershock sequence is deemed to have ended when

400-519: A low number of aftershocks and high foreshock rates compared to continental strike-slip faults . Seismologists use tools such as the Epidemic-Type Aftershock Sequence model (ETAS) to study cascading aftershocks and foreshocks. Following a large earthquake and aftershocks, many people have reported feeling "phantom earthquakes" when in fact no earthquake was taking place. This condition, known as "earthquake sickness"

450-644: A main shock and its largest aftershock is approximately constant, independent of the main shock magnitude, typically 1.1–1.2 on the Moment magnitude scale . Aftershock sequences also typically follow the Gutenberg–Richter law of size scaling, which refers to the relationship between the magnitude and total number of earthquakes in a region in a given time period. Where: In summary, there are more small aftershocks and fewer large aftershocks. Aftershocks are dangerous because they are usually unpredictable, can be of

500-599: A regional station of the Kern County Sheriff's Department . The Kern County Fire Department provides fire protection and emergency medical services. Full-time law enforcement employees in 2008 numbered 56 (41 officers). Crime statistics for 2011 (reported by the Ridgecrest Police Department): Notable natives include: Ridgecrest has one TV station, KZGN-LD, owned by Wiknich Broadcasting Corp., that has 3 channels serving

550-538: A series of significant earthquakes, including the strongest to impact the area in decades—a magnitude 7.1 mainshock. The epicenter of the main earthquake was located approximately 10 miles northeast of Ridgecrest. The sequence began on July 4 with a 4.0-magnitude quake approximately 11 kilometers (6.8 mi) southwest of Searles Valley . Later that morning, at 10:33 A.M., a 6.4-magnitude earthquake struck around 12 kilometers (7.5 mi) southwest of Searles Valley. This initial sequence triggered over 1,400 aftershocks in

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600-621: Is a city in Kern County, California , United States, along U.S. Route 395 in the Indian Wells Valley in northeastern Kern County, adjacent to the Naval Air Weapons Station China Lake (NAWS, or China Lake). It was incorporated as a city in 1963. The population was 27,959 at the 2020 census , up slightly from 27,616 at the 2010 census . Ridgecrest is surrounded by four mountain ranges;

650-492: Is best known for the guided tours to Little Petroglyph Canyon on China Lake Naval Weapons Station (NAWS). The museum offers exhibits and displays featuring both the natural and the cultural history and diversity of the Northern Mojave Desert with exhibits of plants , animals , Native American artifacts, geology and contemporary arts and crafts. Coso Rock Art District , sometimes equated with

700-412: Is expressed as where k and c are constants, which vary between earthquake sequences. A modified version of Omori's law, now commonly used, was proposed by Utsu in 1961. where p is a third constant which modifies the decay rate and typically falls in the range 0.7–1.5. According to these equations, the rate of aftershocks decreases quickly with time. The rate of aftershocks is proportional to

750-549: Is known to have wind as high as 75 mph (121 km/h). December is the coolest month with an average maximum temperature of 60 °F (16 °C) and an average minimum temperature of 30 °F (−1 °C). The all-time minimum temperature of 1 °F (−17 °C) was recorded on December 23, 1963, and January 7, 1973. July is the hottest month with an average maximum temperature of 103 °F (39 °C) and an average minimum temperature of 66 °F (19 °C). The all-time maximum temperature of 119 °F (48 °C)

800-643: Is land and 0.7 sq mi (1.8 km ) of it (3.04%) is water. Ridgecrest is located in Indian Wells Valley, which is a southern extension of Owens Valley , broken up by the volcanic Coso Range . The area, associated with the Eastern California Shear Zone , has in the past experienced numerous earthquake swarms , groups of several thousand quakes under magnitude 6.0 or so, often with no obvious mainshock. The 1995 Ridgecrest earthquake sequence started on August 17, when

850-572: Is located in the upper Mojave Desert near Ridgecrest. The IWV Campus is the largest of the Cerro Coso campuses. It serves a population of about 50,000. The college serves the communities of Ridgecrest, China Lake , Inyokern , and Trona . Ridgecrest Branch Library, a branch of the Kern County Library , serves Ridgecrest, Inyokern, China Lake, Trona and surrounding communities. Ridgecrest has its own police department, as well as

900-622: The Big and Little Petroglyph Canyons is a site containing over 20,000 Native American petroglyphs now located within Naval Air Weapons Station China Lake , near China Lake and Ridgecrest, California. In fact, there are several other distinct canyons to the Coso Rock Art District besides the Big and Little Petroglyph Canyons. The most popular subjects are bighorn sheep, deer, and antelope. Big and Little Petroglyph Canyons were declared

950-524: The 1812 New Madrid earthquake . Some scientists have tried to use foreshocks to help predict upcoming earthquakes , having one of their few successes with the 1975 Haicheng earthquake in China. On the East Pacific Rise however, transform faults show quite predictable foreshock behaviour before the main seismic event. Reviews of data of past events and their foreshocks showed that they have

1000-576: The Inyokern Airport . There are currently no scheduled commercial flights. The city has been near the epicenter of major earthquakes , including one in 1995 and a series of quakes in July 2019 . The settlement began as a farming community called Crumville in 1912, honoring James and Robert Crum, local dairymen. The first post office opened in 1941. By 1943, Ridgecrest had grown to 115 homes and 196 residents. NOTS (Naval Ordnance Test Station)

1050-668: The Kiavah Wilderness Area, managed by the Bureau of Land Management . The Scodie Mountains are an ecotone of Mojave Desert and Sierra Nevada flora, with plant communities differentiated by elevation. They lie to the north of the Jawbone-Butterbredt Area of Critical Environmental Concern . This Kern County, California -related article is a stub . You can help Misplaced Pages by expanding it . Ridgecrest, California Ridgecrest

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1100-703: The Sierra Nevada on the west, the Cosos on the north, the Argus Range on the east, and the El Paso Mountains on the south. It is approximately 82 miles (132 km) from the Lancaster / Palmdale area, 110 miles (177 km) from Bakersfield , and 120 miles (193 km) from San Bernardino , the three nearest major urban centers. Private air travel in and out of the city is provided through

1150-523: The poverty line , including 17.5% of those under age 18 and 5.1% of those age 65 or over. People in group quarters: Naval Air Weapons Station China Lake (NAWS China Lake) is an airborne weapons testing and training range located adjacent to Ridgecrest and operated by the United States Navy and its contractors. Naval Air Weapons Station China Lake provides the majority of employment in the city at just under 8,000 jobs in 2018. This includes

1200-434: The school district includes James Monroe Middle School, and Murray Middle School. The district's primary high school , Sherman E Burroughs High School , serves Ridgecrest, China Lake NAWC, Inyokern , Buttermilk Acres, Red Mountain, and Randsburg . There is also an alternative high school , Mesquite High School. Ridgecrest Elementary Academy for Language, Music, and Science ( REALMS )is a public charter school sponsored by

1250-463: The 107.1, with KCNV classical music feed. KRCK-1360, "Ridgecrest Radio", went off the air in the 1970s. TV repeater K05FO 5 rebroadcasts KTLA ; and K35HO-D 35 rebroadcasts KBAK . The town of Junktown in the video game Fallout is based on a post-apocalyptic version of Ridgecrest. In a 1984 Sony commercial, Ridgecrest is known as the "Earthquake Capital of the World..." Ridgecrest is located at

1300-587: The Country" Walker Pass (elevation 5,250 ft (1.60 km)) is a mountain pass by Lake Isabella in the southern Sierra Nevada mountains. It is located in northeastern Kern County , approximately 53 mi (85 km) ENE of Bakersfield and 10 mi (16 km) WSW of Ridgecrest. The pass provides a route between the San Joaquin Valley on the west and the Mojave Desert on

1350-477: The IWV TV Booster. Radio stations in the area include KRSF 89.3 a Christian radio format with Radio 74 ; KZFX 93.7 a classic rock format with ABC and California news and weather; KSSI (FM) 102.7, broadcasting rock music, local news and weather; KLOA (AM) 1240, broadcasting CBS Sports Radio ; KZIQ 92.7, featuring adult contemporary music; KRAJ The Heat 100.9 FM, featuring a hip-hop format; and K296AI

1400-627: The Kern County Office of Education. Opened in 2019, the school educates children from Transitional K to the 6th grade. The school campus was formerly a Transitional K to 8th grade school which operated from 2001 to 2018 under the name Ridgecrest Charter School. Cerro Coso Community College, a part of the Kern Community College District , was established in 1973 and has a full-time enrollment of 2,347. The 420 acres (1.7 km ) Indian Wells Valley Campus (IWV)

1450-493: The Ridgecrest and Searles Valley regions. On July 5, 2019, at 8:19 P.M., the magnitude 7.1 mainshock occurred, significantly impacting the Ridgecrest area. The weather in the Indian Wells Valley is predominantly influenced by its high desert location. The climate is characterized by hot days and cool nights with extremely arid conditions prevailing throughout the summer months. The mean annual maximum temperature for

1500-413: The Ridgecrest area is 75 °F (24 °C) while the mean annual minimum temperature is 48 °F (9 °C). There are wide annual temperature fluctuations that occur from a high of 119 °F (48 °C) to a low of 1 °F (−17 °C). On average, annual rainfall is less than 5 inches (130 mm) "equivalent rainfall" per year, which includes less than 2 inches (51 mm) of snow . The area

1550-414: The city was 82.02% White , 3.53% Black or African American , 1.08% Native American , 3.88% Asian , 0.58% Pacific Islander , 4.93% from other races , and 3.98% from two or more races. 12.04% of the population were Hispanic or Latino of any race. There were 9,826 households, out of which 35.0% had children under the age of 18 living with them, 52.2% were married couples living together, 11.5% had

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1600-612: The east. Trona Pinnacles featured in many notable films are located near Ridgecrest. Red Rock Canyon State Park is also very close to Ridgecrest and provides the community with hiking and camping opportunities. Sierra Sands Unified School District , which serves the city of Ridgecrest, Inyokern, and the surrounding communities, includes the following elementary schools: Las Flores Elementary, Faller Elementary, Richmond Elementary currently displaced to Vieweg Elementary due to damage in recent earthquakes, Gateway Elementary, Pierce Elementary, and Inyokern Elementary. For middle-schoolers

1650-558: The entire Indian Wells Valley over the air and on Mediacom Cable. KZGN provides local news, weather and sports. KZGN also provides a daily local interview program, Ridgecrest Talk . Ridgecrest is served by two newspapers, The Daily Independent and the News Review , as well as a mixture of local broadcast stations and repeaters from radio and TV stations based in Los Angeles and Bakersfield . The repeaters are operated by

1700-481: The government civilian workforce, active duty military personnel and private contractors. AltaOne Federal Credit Union has its corporate headquarters in Ridgecrest. The Searles Valley Minerals plant is located adjacent to the Searles Dry Lake near the town of Trona, California , about thirty miles east of Ridgecrest. The principal employers in Ridgecrest in 2020 were: The most notable feature in

1750-401: The inverse of time since the mainshock and this relationship can be used to estimate the probability of future aftershock occurrence. Thus whatever the probability of an aftershock are on the first day, the second day will have 1/2 the probability of the first day and the tenth day will have approximately 1/10 the probability of the first day (when p is equal to 1). These patterns describe only

1800-633: The junction of highways California State Route 178 and U.S. Route 395 (business route). The city of Ridgecrest provides the Ridgecrest Transit shuttle bus service to and from Inyokern, connecting with the Eastern Sierra Transit Authority bus that serves Bishop and Mammoth Lakes to the north, and Lancaster (Metrolink station) , with connections to the San Fernando Valley and Los Angeles, to

1850-570: The nearby area is the Coso People rock art in Big and Little Petroglyph Canyons . The Coso People were prolific artists and traded with distant tribes using tools crafted of stone. Archeological recovery at coastal Chumash sites in California indicates considerable trade with the Coso People . Other activities in the area are: The Maturango Museum is located in Ridgecrest. The museum

1900-646: The population) lived in households, 109 (0.4%) lived in non-institutionalized group quarters, and 87 (0.3%) were institutionalized. There were 10,781 households, out of which 3,901 (36.2%) had children under the age of 18 living in them, 5,211 (48.3%) were opposite-sex married couples living together, 1,352 (12.5%) had a female householder with no husband present, 609 (5.6%) had a male householder with no wife present. There were 681 (6.3%) unmarried opposite-sex partnerships , and 64 (0.6%) same-sex married couples or partnerships . 2,978 households (27.6%) were made up of individuals, and 1,001 (9.3%) had someone living alone who

1950-419: The population) lived in owner-occupied housing units and 10,900 people (39.5%) lived in rental housing units. According to the census of 2000, there were 24,927 people, 9,826 households, and 6,691 families residing in the city. The population density was 1,179.9 inhabitants per square mile (455.6/km ). There were 11,309 housing units at an average density of 535.3/sq mi (206.7/km ). The racial makeup of

2000-689: The rate of seismicity drops back to a background level; i.e., no further decay in the number of events with time can be detected. Land movement around the New Madrid is reported to be no more than 0.2 mm (0.0079 in) a year, in contrast to the San Andreas Fault which averages up to 37 mm (1.5 in) a year across California. Aftershocks on the San Andreas are now believed to top out at 10 years while earthquakes in New Madrid were considered aftershocks nearly 200 years after

2050-403: The rupture initiated) lay to one end of the final area of slip, implying strongly asymmetric rupture propagation. Aftershocks rates and magnitudes follow several well-established empirical laws. The frequency of aftershocks decreases roughly with the reciprocal of time after the main shock. This empirical relation was first described by Fusakichi Omori in 1894 and is known as Omori's law. It

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2100-410: The solution of a differential equation describing the evolution of the aftershock activity, where the interpretation of the evolution equation is based on the idea of deactivation of the faults in the vicinity of the main shock of the earthquake. Also, previously Utsu-Omori law was obtained from a nucleation process. Results show that the spatial and temporal distribution of aftershocks is separable into

2150-464: The south. Kern Transit connects Ridgecrest to Lake Isabella and Mojave . Aftershocks In seismology , an aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock , caused as the displaced crust adjusts to the effects of the main shock. Large earthquakes can have hundreds to thousands of instrumentally detectable aftershocks, which steadily decrease in magnitude and frequency according to

2200-404: The statistical behavior of aftershocks; the actual times, numbers and locations of the aftershocks are stochastic , while tending to follow these patterns. As this is an empirical law, values of the parameters are obtained by fitting to data after a mainshock has occurred, and they imply no specific physical mechanism in any given case. The Utsu-Omori law has also been obtained theoretically, as

2250-420: The volume affected by the strain associated with the main shock. Typically, aftershocks are found up to a distance equal to the rupture length away from the fault plane. The pattern of aftershocks helps confirm the size of area that slipped during the main shock. In both the 2004 Indian Ocean earthquake and the 2008 Sichuan earthquake , the aftershock distribution in each case showed that the epicenter (where

2300-595: Was recorded on July 11, 2021, tied with July 1988 and July 1993. The 2010 United States Census reported that Ridgecrest had a population of 27,616. The population density was 1,289.5 inhabitants per square mile (497.9/km ). The racial makeup of Ridgecrest was 21,387 (77.4%) White , 1,113 (4.0%) African American , 341 (1.2%) Native American , 1,209 (4.4%) Asian , 143 (0.5%) Pacific Islander , 1,836 (6.6%) from other races , and 1,587 (5.7%) from two or more races. Hispanic or Latino of any race were 4,941 persons (17.9%). The Census reported that 27,420 people (99.3% of

2350-418: Was 33.8 years. For every 100 females, there were 100.3 males. For every 100 females age 18 and over, there were 99.9 males. There were 11,915 housing units at an average density of 556.3 units per square mile (214.8 units/km ), of which 6,525 (60.5%) were owner-occupied, and 4,256 (39.5%) were occupied by renters. The homeowner vacancy rate was 2.9%; the rental vacancy rate was 9.2%. 16,520 people (59.8% of

2400-408: Was 36 years. For every 100 females, there were 99.6 males. For every 100 females age 18 and over, there were 97.9 males. The median income for a household in the city was $ 44,971, and the median income for a family was $ 52,725. Males had a median income of $ 46,993 versus $ 29,558 for females. The per capita income for the city was $ 21,312. About 10.2% of families and 12.3% of the population were below

2450-417: Was 65 years of age or older. The average household size was 2.54. There were 7,172 families (66.5% of all households); the average family size was 3.10. The population was spread out, with 7,544 people (27.3%) under the age of 18, 2,654 people (9.6%) aged 18 to 24, 7,157 people (25.9%) aged 25 to 44, 6,844 people (24.8%) aged 45 to 64, and 3,417 people (12.4%) who were 65 years of age or older. The median age

2500-698: Was established in November 1943, providing a strong job base for the years to come. Ridgecrest incorporated in 1963. During this era the growth of Ridgecrest was governed by the continuing needs of the high tech industries coupled to the Naval Air Weapons Station (NAWS) programs for testing arms and guidance systems. According to the United States Census Bureau , the city has a total area of 21.4 square miles (55.4 km ), of which 20.8 sq mi (53.9 km )

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