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. El Centro, CA - Array Sta 9; Imperial Valley Irrigation District - 302 Commercial. The 1918 San Jacinto earthquake occurred in extreme eastern San Diego County in Southern California on April 21 at 14:32:29 local time. It is unknown whether there were fatalities. The shock had a moment magnitude of 6.7 and a maximum Mercalli intensity of IX (Violent). 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 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. [15] It is often used in design of earthquake-proof structures today, particularly for the time history analysis method. [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. Damage done to the El Centro Buddhist Church during the 1940 earthquake. It cuts across the border between the United States and Mexico. It was intensely studied by structural engineers and assumed to be typical until the Northridge earthquake … This reassessment is also related to the unusual character of the earthquake. Before 1985, also search (El Centro OR Imperial Valley) AND earthquakes AND 1940. Added to Thesaurus in 1993. 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 entire wiki with photo and video galleries for each article 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. The shock caused 40 miles of surface faulting on the Imperial Fault, part of the San Andreas system in … [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. Kakumin Fuji-naga wrapped the sculpture in a blanket and carried it out to his car. The county took its name from Imperial Valley. There were no reported casualties, but the event affected the then largely-uninhabited areas of northern Mexico and Southern California. [9] The Imperial Fault had not been previously differentiated from the other faults in the area by geologists until after the earthquake occurred. 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 earthquake had a relatively shallow hypocenter and caused property damage in the United States estimated at US$30 million. Thank you for helping build the largest language community on the internet. 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 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. 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. Figure 4.2 Displacement response spectra of El-Centro, 1940 earthquake ground motion. 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. [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. 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. The region was lightly populated at the time, although structural damage was reported in San Francisco, Oakland, and Monterey. … Both main shocks were larger than the deadly earthquake that struck Los Angeles on October 1, which was a magnitude 5.9. Language; Watch; Edit; There are no discussions on this page. 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. 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. Your email address will not be published. Example: determine the following structure’s response to the 1940 El Centro earthquake. 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. It was the first major earthquake to be recorded by a strong-motion seismograph located next to a fault rupture. Bridges and flumes buckled as a result of repeated up and down earth movements. The shock originated at 15:40:41 local time south of Guadalupe Victoria, Baja California, Mexico. Geologically, the El Centro earthquake of 1940 on the Mercalli intensity scale. 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. 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