Solomon_Time_History.zip: El Centro Earthquake 1940. Damage to irrigation systems was so widespread that it is … [2] [13] The railroad system also suffered damage, with bent rails and damage to several bridges. Although damage was considered light, several loss estimates equaled or exceeded $2 million, and six injuries resulted when two vehicles came down with the partial collapse of a highway overpass on US 101 in Fields Landing. [6] The Imperial Fault is linked to the San Andreas Fault through the Brawley Seismic Zone, which is a spreading center beneath the southern end of the Salton Sea. The shock caused 40 miles of surface faulting on the Imperial Fault, part of the San Andreas system in … The fire was blamed on a short circuit. Reconstruction of banks became necessary as ground subsided. UCSD Shake Table - 160% El Centro Earthquake - Duration: 0:36. The earthquake took nine lives from a region that, at the time, had a population of about 40,000, and caused $6 million worth of property damage, including the effects of a strong aftershock near Brawley. The 1986 Chalfant Valley earthquake struck southern Mono County near Bishop and Chalfant, California at 07:42:28 Pacific Daylight Time on July 21. Earthquake excitation Giacomo Bo Combined D V A spectrum In the following, we will use the symbols D , V and A to represent the values of the DRS, PVRS and PARS spectra, respectively, with V = ! … [3] The heaviest damage in Mexicali, the capital of the State of Baja California, was a fire which destroyed a hotel there. EL-CENTRO SITE IMPERIAL VALLEY IRRIGATION DISTRICT (COMP S00E) 2 9: EL-CENTRO COMP S90W: Data (ground accelerations) N = 2379. dt = 0.02 sec . The shock occurred on the Calaveras Fault near Coyote Lake in Santa Clara County, California and resulted in a number of injuries, including some that required hospitalization. No injuries or deaths occurred, but damage was estimated at $1–3 million. The following is a summary of the conclusions reached after an exhaustive analysis of the strong‐motion accelerograph record obtained by the United States Coast and Geodetic Survey at El Centro, California, at the time of the destructive Imperial Valley earthquake of May 18, 1940. The 1983 Coalinga earthquake struck at 4:42 p.m. Monday, May 2 of that year, in Coalinga, California. The 1952 Kern County earthquake occurred on July 21 in the southern San Joaquin Valley and measured 7.3 on the moment magnitude scale. The SJFZ is a component of the larger San Andreas transform system and is considered to be the most seismically active fault zone in the area. La ĉi-suba teksto estas aŭtomata traduko de la artikolo 1940 El Centro earthquake article en la angla Vikipedio, farita per la sistemo GramTrans on 2016-01-23 07:05:34. Miles of drainage ditches were obstructed by elevation of the ground with, in several locations, water escaping on to adjacent land. The 1940 El Centro earthquake (or 1940 Imperial Valley earthquake) occurred at 21:35 Pacific Standard Time on May 18 (05:35 UTC on May 19) in the Imperial Valley in southeastern Southern California near the international border of the United States and Mexico.It had a moment magnitude of 6.9 and a maximum perceived intensity of X (Extreme) on the Mercalli intensity scale. [15]. Based on geological sampling, the fault created approximately 1.5 meters of slip. With a moment magnitude of 6.2 and a maximum Mercalli intensity of VI (Strong), the shock injured two people and caused property damage estimated at $2.7 million in the affected areas. The 1980 Eureka earthquake occurred on November 8 at 02:27:34 local time along the northern coastal area of California in the United States. If the ground acceleration from an earthquake is known, the response of the structure can be computed via using the Newmark’s method. In addition, there was extensive destruction to the structures and canals of the Imperial Irrigation District (IID) with ground displacements as large as 10–14 feet. A non-destructive aftershock sequence that lasted throughout the remainder of the month was of interest to seismologists, especially with regard to fault creep, and following the event local governments evaluated their response to the incident. Most of the $500,000 in damage that was caused was non-structural, but several businesses were closed for repairs. [3] A strong secondary quake with a magnitude of 5.5 followed a little more than an hour after the main shock and was centered near Brawley. The digitized values of the response spectra Sd, Sv and Sa of the El-Centro, 1940 earthquake is given in the Appendix – II at an interval of 0.01 sec time period for damping ratio of 2% and 5%. Just better. [15] It is often used in design of earthquake-proof structures today, particularly for the time history analysis method. TYPE OF FAULT: right-lateral strike-slip LENGTH: 69 km NEAREST COMMUNITIES: Brawley, Imperial, El Centro, Calexico, Mexicali LAST SURFACE RUPTURE: October 15, 1979, Mw6.4; May 18, 1940, Mw6.9; several other small ruptures and instances of triggered slip SLIP RATE: between 15 and 20 mm/yr Irrigation water is supplied from the Colorado River via the All-American Canal. It affected Imperial Valley in Southern California and Mexicali Valley in northern Baja California. The Valley was named for the Imperial Land Company—a subsidiary of the California Development Company—which at the beginning of the twentieth century had reclaimed the southern portion of the Colorado Desert for agriculture. The earthquake was characterized as a typical moderate-sized destructive event with a complex energy release [10] [11], The event caused significant damage in the towns of Brawley, Imperial, El Centro, Calexico and Mexicali and was responsible for the deaths of nine people. The details of this investigation will appear in a forthcoming report of the Coast and Geodetic Survey. The 1940 El Centro earthquake (or 1940 Imperial Valley earthquake) occurred at 21:35 Pacific Standard Time on May 18 (05:35 UTC on May 19) in the Imperial Valley in southeastern Southern California near the international border of the United States and Mexico. Relative displacement of seismometer. Response spectra for the El Centro 1940 earthquake. With the San Jacinto Fault Zone to the west, the Elsinore fault to the south-southwest, and the Imperial fault centered directly under the Imperial Valley, the area frequently encounters seismic activity, including moderate and damaging earthquakes. This article is of interest to the following WikiProjects: WikiProject Earthquakes (Rated B-class, High-importance) This article is part of WikiProject Earthquakes, a project to systematically present information on earthquakes, seismology, plate tectonics, and related subjects. The displacement pattern of the two earthquakes was very similar on the US side, suggesting that the Imperial Fault slips in discrete patches. The San Jacinto Fault Zone (SJFZ) is a major strike-slip fault zone that runs through San Bernardino, Riverside, San Diego, and Imperial Counties in Southern California. The earthquakes caused damage to places in California and Mexico, and was felt as far as Las Vegas and Phoenix. The sense of movement along the rupture was almost pure strike-slip, with no vertical displacement seen. There were no reported casualties, but the event affected the then largely-uninhabited areas of northern Mexico and Southern California. Required fields are marked *. [3] During the 1979 Imperial Valley earthquake the same section of the fault ruptured on the US side of the border, but this time there was no sign of rupture on the Mexican side. The shock originated at 15:40:41 local time south of Guadalupe Victoria, Baja California, Mexico. The Salton Trough is part of the complex plate boundary between the Pacific Plate and the North American Plate where it undergoes a transition from the continental transform of the San Andreas Fault system to the series of short spreading centers of the East Pacific Rise linked by oceanic transforms in the Gulf of California. With a Mercalli intensity of VII, this was one of fifteen intensity VII or greater shocks in the Imperial Valley that were observed in the 20th century up until April 1981. USGS Description of the El Centro (Imperial Valley) Earthquake Nine people were killed by the May 1940 Imperial Valley earthquake. The shock had a moment magnitude of 6.7 and a maximum Mercalli intensity of IX (Violent). The 1940 El Centro earthquake (or 1940 Imperial Valley earthquake) occurred at 21:35 Pacific Standard Time on May 18 (05:35 UTC on May 19) in the Imperial Valley in southeastern Southern California near the international border of the United States and Mexico. Geologically, the El Centro earthquake of 1940 on the Mercalli intensity scale. Definitions of 1940 El Centro earthquake, synonyms, antonyms, derivatives of 1940 El Centro earthquake, analogical dictionary of 1940 El Centro earthquake (English) The county took its name from Imperial Valley. The 1940 El Centro earthquake (or 1940 Imperial Valley earthquake) occurred at 21:35 Pacific Standard Time on May 18 (05:35 UTC on May 19) in the Imperial Valley in southeastern Southern California near the international border of the United States and Mexico. It consisted of numerous quakes, all of them occurring in the first fifteen seconds of the event, followed by several shakings within the next five minutes. It affected approximately 100 km of the fault, from the San Francisco Peninsula to the Santa Cruz Mountains. There was a significant foreshock and aftershock sequence that included a few moderate events, and was the last in a series of three earthquakes that affected southern California and the northern Owens Valley in July 1986. Magnitudes are usually determined from measurements of an earthquake's seismic waves as recorded on a seismogram. (adsbygoogle = window.adsbygoogle || []).push({}); Your email address will not be published. 23:20 Pacific Standard Time on February 23, Bulletin of the Seismological Society of America, "Surface faulting in the central Imperial Valley", "Imperial Valley, California. Two weeks’ worth of water loss would have been catastrophic for this crop. The shock was felt from the central coast of California in the north, and to Baja California in the south, and came at a time when earthquake research in southern California was being resumed following the Second World War. [5] It was the strongest recorded earthquake to hit the Imperial Valley, and caused widespread damage to irrigation systems and led to the deaths of nine people. El Centro Earthquake Data Analysis This application analyzes the response of a SDOF to the 1940 El Centro earthquake using acceleration data recorded from a seismograph located near the fault line. Imperial appeared to receive the most damage and was described as "razed" with at least 80% of the buildings in that city being damaged, [8] and at least two people being killed there. El Centro earthquake 1940 ; BT: earthquakes .El Centro earthquake 1940: UF: Imperial Valley earthquake 1940: RT: California : Imperial Valley : El Centro California: SN: Imperial Valley, California. [13], In Mexico, a 427 m (1,401 ft) long wooden flume was completely destroyed south of Mexicali where the Solfatara canal crossed the New River, and water storage tanks were destroyed at Imperial and Holtville. Se vi volas enigi tiun artikolon en la originalan Esperanto-Vikipedion, vi povas uzi nian specialan redakt-interfacon. The 1940 El Centro earthquake (or 1940 Imperial Valley earthquake) occurred at 21:35 Pacific Standard Time on May 18 (05:35 UTC on May 19) in the Imperial Valley in southeastern Southern California near the international border of the United States and Mexico.It had a moment magnitude of 6.9 and a maximum perceived intensity of X (Extreme) on the Mercalli intensity scale. Earthquake Information Fault Name Index Imperial Fault Zone. This was the largest earthquake in Southern California since the 1952 Kern County earthquake 16 years prior. The 1940 El Centro earthquake (or 1940 Imperial Valley earthquake) occurred at 21:35 Pacific Standard Time on May 18 (05:35 UTC on May 19) in the Imperial Valley in southeastern Southern California near the international border of the United States and Mexico.wikipedia. The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. The entire wiki with photo and video galleries for each article 9 people died in the 1940 El Centro earthquake. Normally these would be called aftershocks but, because they were comparable in magnitude to the main event, they must all be regarded as part of a single earthquake. Seismic magnitude scales are used to describe the overall strength or "size" of an earthquake. Additionally, a spectrogram and a power spectrum of the earthquake data are generated. Damage to other centers such as El Centro and Holtville was much less. [3]. [5] The majority of the energy released during the earthquake occurred in the first fifteen seconds, although significant energy was released as late as the last of those events, near the 5:20 mark on the seismograph record. Your email address will not be published. Not until the San Fernando earthquake of 1971 were comparable records available. The Imperial Valley of California, near El Centro, located about ten miles from the Mexican border, was hit with a magnitude 7.1 earthquake on May 19, 1940. n D ; A = ! The Strong Motion Earthquake Data Values of Digitized Strong-Motion Accelerograms is a database of over 15,000 digitized and processed accelerograph records from 1933 to 1994. [3], The earthquake also caused substantial damage to irrigation systems over a very wide area of the valley, with the canals of the Imperial Irrigation District being breached in multiple locations. With ninety percent of the damage done to the canals south of the international border, water rationing became necessary in Brawley and Imperial during the days following the earthquake spanning the restoration period. Together they relieve the majority of the stress between the Pacific and North American tectonic plates. [16], The recording showed that the earthquake consisted of several sub-events, with a total of 13 being recorded in just over five minutes. It was the first major earthquake to be recorded by a strong-motion seismograph located next to a fault rupture. How to transfigure the Wikipedia . The Valley is a working agricultural area, one of the most productive agricultural areas of the world and the largest year-round irrigated agricultural area in North America. 55 relations. [14], A strong-motion seismograph at El Centro recorded the earthquake and provided the first example of such a recording made very close to a fault rupture in a major earthquake. It was the largest earthquake to occur in the contiguous United States since the 1971 San Fernando earthquake eight years earlier. Strong Motion Earthquake Data Values of Digitized Strong-Motion Accelerograms, 1933-1994 Accelerograph image of the Imperial Valley Aftershock May 19, 1940 at El Centro, California. The north coast of California experiences frequent plate boundary earthquakes near the Mendocino Triple Junction and intraplate events also occur within the Gorda Plate. Major damage was caused in the area. In the business district of Brawley, all structures were damaged, and about 50 percent had to be condemned. The 1892 Laguna Salada earthquake occurred at 23:20 Pacific Standard Time on February 23. The 1948 Desert Hot Springs earthquake occurred on December 4 at 3:43 p.m. Pacific Standard Time with a moment magnitude of 6.4 and a maximum Mercalli intensity of VII. The 2010 Baja California earthquake occurred on April 4 with a moment magnitude of 7.2 and a maximum Mercalli intensity of IX (Violent). [17] A 1970 report on the earthquake in the Bulletin of the Seismological Society of America defined an event as "any occurrence of energy release which generates seismic phases that can be resolved and identified" then stated that the size of those discrete events were abnormally strong for regular aftershocks. As a result of the earthquake, a 40,000-gallon water tank at Holtville collapsed as did a 100,000-gallon tank at Imperial. The Family: Hospital Visit from The Carol Burnett Show (full sketch) - Duration: 14:31. 100% (1/1) Imperial Imperial Valley, California Imperial Valleys. Fortunately, water was restored within four days. Both shocks had an estimated Ms magnitude of 5.6, and a maximum Mercalli intensity of VII. Soon after the Imperial Valley earthquake occurred, all available manpower and machinery were brought in to repair the Alamo and Solfatara canals of the IID. The earthquake occurred on the White Wolf Fault near the community of Wheeler Ridge and was the strongest to occur in California since the 1906 San Francisco earthquake. This reassessment is also related to the unusual character of the earthquake. Earthquake Information Fault Name Index Imperial Fault Zone. The Imperial Valley earthquake of 1940 is particularly important to the history of California because it was the first earthquake to provide documented evidence of surface rupturing since the 1906 San Francisco quake. [19], Soon after the earthquake, reconstruction efforts were concentrated on repairing the Alamo and Solfatara irrigation canals to save the cantaloupe crop, and the water supply was restored in less than four days. 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