The 1968 Borrego Mountain earthquake occurred in the evening hours of April 8, near the small unincorporated community of Ocotillo Wells in San Diego County. Talk:1940 El Centro earthquake. [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. 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. The earthquake was characterized as a typical moderate-sized destructive event with a complex energy release That's it. The north coast of California experiences frequent plate boundary earthquakes near the Mendocino Triple Junction and intraplate events also occur within the Gorda Plate. 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. Example: determine the following structure’s response to the 1940 El Centro earthquake. [9] The Imperial Fault had not been previously differentiated from the other faults in the area by geologists until after the earthquake occurred. 1940 El Centro earthquake. 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. At Imperial, 80 percent of the buildings were damaged to some degree. 9:49. The displacement pattern of the two earthquakes was very similar on the US side, suggesting that the Imperial Fault slips in discrete patches. 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. [7], The earthquake was the result of a rupture along the Imperial Fault, with its epicenter 5 miles (8.0 km) north of Calexico, California. Quite the same Wikipedia. It was a strong earthquake, with an estimated moment magnitude of 6.8 to 7.2, making it one of the largest known earthquakes in California. Fortunately, water was restored within four days. Two of these patches are thought to have ruptured in 1940 but only the northern one in 1979. 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. The 1892 Laguna Salada earthquake occurred at 23:20 Pacific Standard Time on February 23. The shock originated at 15:40:41 local time south of Guadalupe Victoria, Baja California, Mexico. Just better. Because the water table was high, numerous sand boils appeared all over the region—in fields, roads, and under houses—creating three-inch wide craters and sending water and sand several feet into the air. [4] The earthquake was characterized as a typical moderate-sized destructive event with a complex energy release signature. The 1952 Kern County earthquake occurred on July 21 in the southern San Joaquin Valley and measured 7.3 on the moment magnitude scale. Kakumin Fuji-naga wrapped the sculpture in a blanket and carried it out to his car. The Family: Hospital Visit from The Carol Burnett Show (full sketch) - Duration: 14:31. The 1838 San Andreas earthquake is believed to be a rupture along the northern part of the San Andreas Fault in June 1838. The 1979 Imperial Valley earthquake occurred at 16:16 Pacific Daylight Time on 15 October just south of the Mexico–United States border. 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. 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 Carol Burnett Show Official Recommended for you Data from numerous strong motion instruments was used to determine the type, depth, and extent of slip. Miles of drainage ditches were obstructed by elevation of the ground with, in several locations, water escaping on to adjacent land. Figure 4.2 Displacement response spectra of El-Centro, 1940 earthquake ground motion. Shaking from this earthquake was felt over a wide area, even being reported in Las Vegas, Nevada, and parts of Arizona. 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. 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. [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 primary trunkline was the Alamo Canal and it sustained nine breaks, each several hundred feet in length, along a twenty-mile stretch between Sharp's heading and Cudahy check. Damage included minor fractures or knocked over chimneys in a zone extending through New Hampshire and four other states: Maine, New York, Vermont and Massachusetts. The Valley was formed in 1907 from the eastern half of San Diego County. As a result of the earthquake, a 40,000-gallon water tank at Holtville collapsed as did a 100,000-gallon tank at Imperial. 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. The entire wiki with photo and video galleries for each article To install click the Add extension button. Kakumin Fuji-naga wrapped the sculpture in a blanket and carried it out to his car. The canals brought water from the Mexican side of the border to the United States and supplied 3000 miles of irrigation waterways and ditches in the Imperial Valley. These doublet earthquakes were the largest to hit the state in several hundred years. [8], In an interview with the Los Angeles Times shortly after the earthquake, Dr. Beno Gutenberg, a geophysicist and professor at the Caltech Seismological Laboratory in Pasadena, prematurely reported that the source of the quake was the San Jacinto Fault and compared the earthquake to the 1933 Long Beach earthquake saying "The energy of the Imperial Vally shock was less, and it should have done less damage, than the one of 1933, even had it occurred in an area of greater population." Geologically, the El Centro earthquake of 1940 on the Mercalli intensity scale. The earthquakes caused damage to places in California and Mexico, and was felt as far as Las Vegas and Phoenix. EL-CENTRO SITE IMPERIAL VALLEY IRRIGATION DISTRICT (COMP S00E) 2 9: EL-CENTRO COMP S90W: Data (ground accelerations) N = 2379. dt = 0.02 sec . Major damage was caused in the area. 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. How to transfigure the Wikipedia . The 1981 Westmorland earthquake occurred at 05:31 Pacific Daylight Time on April 26. [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 response spectra of the El-Centro, 1940 earthquake ground motion are computed using the exact method described in the Chapterearlier (refer Appendix-I, for digitized values of the earthquake). The irrigation systems in the Imperial Valley were badly affected, but no deaths occurred. The region was lightly populated at the time, although structural damage was reported in San Francisco, Oakland, and Monterey. Damage to irrigation systems was so widespread that it is … [16], The recording showed that the earthquake consisted of several sub-events, with a total of 13 being recorded in just over five minutes. Earthquake Information Chronological Earthquake Index Imperial Valley Earthquake. The 1940 El Centro earthquake was the first major earthquake to be recorded by a strong-motion seismograph located next to a fault rupture (Hough, S.E. 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. [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. Your email address will not be published. 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. 9 people died in the 1940 El Centro earthquake. The moment magnitude 6.6 earthquake reached IX (Violent) on the Mercalli intensity scale, causing some damage in the Imperial Valley, although no injuries or deaths had been reported. 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 [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. (no damping situation) 53/58:153 Lecture 18 Fundamental of Vibration _____ - 6 - Time-histories of ground accelerations from different earthquakes are quite different, the resulting spectra will also be very different. The earthquake was characterized as a typical moderate-sized destructive event with a complex energy release signature (Trifunac & Brune 1970) [13]. 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. The details of this investigation will appear in a forthcoming report of the Coast and Geodetic Survey. The main shock occurred at 4:52 am Pacific Daylight Time, killed 12 people and injured hundreds, and caused an estimated $60 million in property damage. Not until the San Fernando earthquake of 1971 were comparable records available. Both main shocks were larger than the deadly earthquake that struck Los Angeles on October 1, which was a magnitude 5.9. The 2010 Baja California earthquake occurred on April 4 with a moment magnitude of 7.2 and a maximum Mercalli intensity of IX (Violent). It had a moment magnitude of 6.9 and a maximum perceived intensity of X (Extreme) on the Mercalli intensity scale. [3] The heaviest damage in Mexicali, the capital of the State of Baja California, was a fire which destroyed a hotel there. Although the loss of water would have led to the loss of only one crop, cantaloupes, the damage done to this crop would have cost the industry a million and a half dollars. Thank you for helping build the largest language community on the internet. After the initial shock, to protect the church’s gold statue of Amida Buddha, Rev. 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. Irrigation water is supplied from the Colorado River via the All-American Canal. 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 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. It was one of two events in the 20th century that have occurred near a complex region of the southern San Andreas Fault System where it traverses the San Gorgonio Pass and the northern Coachella Valley. Damage done to the El Centro Buddhist Church during the 1940 earthquake. 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%. This gave a detailed record of the different types of shaking associated with the earthquake. The initial estimate of the strength of the earthquake was 6.4 but, as surface destruction was examined in greater detail, it became clear that the present figure of 7.1 is more appropriate; putting the Imperial Valley earthquake comparable to the San Francisco 1906 quake as far as magnitude is concerned. 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 is unknown whether there were fatalities. These are distinguished from seismic intensity scales that categorize the intensity or severity of ground shaking (quaking) caused by an earthquake at a given location. Both shocks had an estimated Ms magnitude of 5.6, and a maximum Mercalli intensity of VII. The fire was blamed on a short circuit. 1940 El Centro earthquake | Wikipedia audio article - Duration: 9:49. wikipedia tts 38 views. This was the largest earthquake in Southern California since the 1952 Kern County earthquake 16 years prior. The 1940 New Hampshire earthquakes struck on December 20 and again on December 24. It was the largest earthquake to occur in the contiguous United States since the 1971 San Fernando earthquake eight years earlier. Damage done to the El Centro Buddhist Church during the 1940 earthquake. The 1979 Coyote Lake earthquake occurred at 10:05:24 local time on August 6 with a moment magnitude of 5.7 and a maximum Mercalli Intensity of VII. The two main right lateral strike-slip fault strands that extend across the southern part of the trough are the Elsinore Fault Zone/Laguna Salada Fault to the western side of the trough and the Imperial Fault to the east. [3]. The Imperial Fault Zone is a system of geological faults located in Imperial County in the Southern California region, and adjacent Baja California state in Mexico. This reassessment is also related to the unusual character of the earthquake. It was the first major earthquake to be recorded by a strong-motion seismograph located next to a fault rupture. It affected approximately 100 km of the fault, from the San Francisco Peninsula to the Santa Cruz Mountains. The shock caused 40 miles of surface faulting on the Imperial Fault, part of the San Andreas system in … Seismic magnitude scales are used to describe the overall strength or "size" of an earthquake. 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 = ! 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. America Canal caused by the 1940 El Centro earthquake. 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. The details of this investigation will appear in a forthcoming report of the Coast and Geodetic Survey. Se vi volas enigi tiun artikolon en la originalan Esperanto-Vikipedion, vi povas uzi nian specialan redakt-interfacon. [15] It is often used in design of earthquake-proof structures today, particularly for the time history analysis method. Eventualaj ŝanĝoj en la angla originalo estos kaptitaj per regulaj retradukoj. [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. The region experiences large stand-alone events and earthquake swarms due to its position in an area of complex conditions where faulting transitions from strike-slip movement to the north and divergence to the south. 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. The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. 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. [12] It was felt as far afield as Los Angeles and Tucson, Arizona. 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. RCPBlockTV 2,134 views. [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 BSZ is named for the nearby town of Brawley in Imperial County, California, and the seismicity there is characterized by earthquake swarms. 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. El Centro has had: (M1.5 or greater) 2 earthquakes in the past 24 hours 37 earthquakes in the past 7 days; 135 earthquakes in the past 30 days; 1,891 earthquakes in the past 365 days Solomon_Time_History.zip: El Centro Earthquake 1940. [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. The strongest recorded quake to strike the Imperial Valley, the 1940 Imperial Valley earthquake caused at least $6 million in direct damage (not taking into consideration the crops lost due to damage of irrigation sysytems) and was directly responsible for the deaths of eight people, and, indirectly, for several others. 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. earthquake", "The repetition of large-earthquake ruptures", "Surface Rupture and Slip Distribution of the 1940 Imperial Valley Earthquake, Imperial Fault, Southern California Implications for Rupture Segmentation and Dynamics", "Complexity of energy release during the Imperial Valley, California, earthquake of 1940", "The Imperial Valley Earthquakes of 1940". There were no reported casualties, but the event affected the then largely-uninhabited areas of northern Mexico and Southern California. 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. El Centro, CA - Array Sta 9; Imperial Valley Irrigation District - 302 Commercial. It is the seventh largest food producing area in the world with such crops as melons, citrus fruits, alfalfa, barley, lettuce, and other vegetables. Other events in 1852, 1892, 1915, 1942, 1979, and 1987 have impacted the region in varying degrees. Language; Watch; Edit; There are no discussions on this page. 55 relations. 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 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. USGS Description of the El Centro (Imperial Valley) Earthquake Nine people were killed by the May 1940 Imperial Valley earthquake. [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. Furthermore, it provided detailed local accounts of the kind of shaking motion that accompanied the event. No injuries or deaths occurred, but damage was estimated at $1–3 million. The sense of movement along the rupture was almost pure strike-slip, with no vertical displacement seen. Added to Thesaurus in 1993. Magnitudes are usually determined from measurements of an earthquake's seismic waves as recorded on a seismogram. The Imperial Valley is a large, flat, crop-growing area in the very south of California, between the Salton Sea which lies to its north and the Mexican border which lies to its south. Relative displacement of seismometer. Before 1985, also search (El Centro OR Imperial Valley) AND earthquakes AND 1940. If the ground acceleration from an earthquake is known, the response of the structure can be computed via using the Newmark’s method. 2004) [7]. Bridges and flumes buckled as a result of repeated up and down earth movements. Damage to other centers such as El Centro and Holtville was much less. Required fields are marked *. [2] [13] The railroad system also suffered damage, with bent rails and damage to several bridges. The moderate strike-slip shock took place in the Imperial Valley of Southern California, just north of the Mexico–United States border in the United States. In the business district of Brawley, all structures were damaged, and about 50 percent had to be condemned. Two weeks’ worth of water loss would have been catastrophic for this crop. Earthquake Information Fault Name Index Imperial Fault Zone. [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. [15]. 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. 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. It cuts across the border between the United States and Mexico. The 1987 Superstition Hills earthquakes were a pair of earthquakes Mw 6.2 and 6.6 that rattled the Imperial Valley of California. Sign in to disable ALL ads. The Brawley Seismic Zone (BSZ), also known as the Brawley fault zone, is a predominantly extensional tectonic zone that connects the southern terminus of the San Andreas Fault with the Imperial Fault in Southern California. 2% damping. The 1940 El Centro earthquake was the first major earthquake to be recorded by a strong-motion seismograph located next to a fault rupture (Hough, S.E. The 1986 Chalfant Valley earthquake struck southern Mono County near Bishop and Chalfant, California at 07:42:28 Pacific Daylight Time on July 21. 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. Time History Data File for North-South Component, time(sec) & Acceleration (G): elcentro.dat Together they relieve the majority of the stress between the Pacific and North American tectonic plates. 100% (1/1) Imperial Imperial Valley, California Imperial Valleys. 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. 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. The shock was centered near the Mexico–United States border and takes its name from a large dry lake bed in Baja California, Mexico. EL-Centro Earthquake 1940 N-S response analysis by Nasser Abbasi Remove "Global` " ; SetDirectory "E: nabbasi data nabbasi_web_Page my_courses UCI_COURSES CREDIT_COURSES fall_2006 CEE_247 HWs HW4" ; Load El-Centro data and plot the earthquack recorded accelration data Import "el_centro.txt","Table" ; dataLength 8Length data ; g Table 0,0 , dataLength ; t Table 0, dataLength ; u … El Centro has had: (M1.5 or greater) 2 earthquakes in the past 24 hours 37 earthquakes in the past 7 days; 135 earthquakes in the past 30 days; 1,891 earthquakes in the past 365 days UCSD Shake Table - 160% El Centro Earthquake - Duration: 0:36. Earthquake Information Fault Name Index Imperial Fault Zone. After the initial shock, to protect the church’s gold statue of Amida Buddha, Rev. Several injuries and one death occurred with total losses estimated to be $200,000. You could also do it yourself at any point in time. 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