It affected Imperial Valley in Southern California and Mexicali Valley in northern Baja California. Home + , During two outings in late 1979 and early 1980 several researchers (including Thomas H. Heaton and John G. Anderson) examined the region near the New River and discovered ground disturbances that were related to the Brawley aftershock. The earthquake was significant in the scientific community for studies of both fault mechanics and repeat events. It affected Imperial Valley in Southern California and Mexicali Valley in northern Baja California. Surface rupture: compression ridge connecting two left-stepping echelon cracks. The 1979 Imperial Valley earthquake occurred at 16:16 Pacific Daylight Time (23:16 UTC) on 15 October just south of the MexicoâUnited States border. Slumping of the foundations there resulted in severe damage, and occurred as a result of the 15 October main shock, though the Brawley earthquake's epicenter was nearby. Because of its failure at the foundation and first floor level, the building was considered a total loss and was ultimately demolished. Governor Jerry Brown ended a presidential campaign trip through New England early in order to return to the Imperial Valley and declare a state of emergency there. Quite the same Wikipedia. It was the largest earthquake to occur in the contiguous United States since the 1971 San Fernando earthquake eight years earlier.  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. Surface rupture: single straight break along the Superstition Hills Fault. California's Interstate 8 developed cracks in it, but vehicles were still able to traverse the highway. California's Interstate 8 developed cracks in it, but vehicles were still able to traverse the highway. , The pattern of displacement along the Imperial Fault was very similar to that observed for the northern part of the rupture during the 1940 El Centro earthquake, although on this occasion the rupture did not extend across the border into Mexico. At the Imperial County Dump, several instances of ground failure were observed in sedimentary deposits near the top of and parallel to the river bank, and other cracks were found in that area that were determined to be the result of differential settling. The maximum observed right lateral displacement on the Imperial faultâmeasured within the first day of the event to the northwest of the epicenterâwas 55â60Â cm (22â24Â in), but measurements taken five months following the earthquake closer to the southeast end of the rupture showed there was an additional 29Â cm (11Â in) of postseismic slip (for a total slip of 78Â cm (31Â in). , The earthquake caused damage to the Californian cities of El Centro and Brawley, and in the Mexican city of Mexicali Mexico. , During two outings in late 1979 and early 1980 several researchers (including Thomas H. Heaton and John G. Anderson) examined the region near the New River and discovered ground disturbances that were related to the Brawley aftershock. Congratulations on this excellent ventureâ¦ what a great idea! It was one of the first heavily instrumented office buildings to be severely damaged by seismic forces. The origin time of the 1979 Imperial Valley earthquake is 23hr16min54.5sec with an epicenter of 32.63°N, 115.33°W, or approximately 5 km south of the international border (Brady et al., 1980). Two weeks following the earthquake sand boils at the same location were still discharging water.. This location is approximately the same as that of the 1940 Imperial Valley earthquake. Fault Ruptured: Imperial (main and North Extension), Brawley, and Rico faults The accelerations recorded on the equipment during the event proved to be of very low amplitude and, as a result, the instrumentation was upgraded to include a 13 channel configuration in the building along with a Kinemetrics triaxial (3 channel) accelerograph located 340 ft (100 m) east of the building at ground level. A hydraulic gate and a concrete facility that were damaged during the May 1940 earthquake needed repair again. A 13 km (8.1 mi) section of the unlined canal between the Ash and East Highline canals experienced settling. With the San Jacinto Fault Zone to the northwest, 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 1940 event caused significant destruction to canals on both sides of the international border, with 108 km (67 mi) of damage along eight canals on the US side alone. A similar preliminary report of strong-motion data collected by the Office of Strong-Motion Studies of the California Division of Mines and Geology has already been 1ssued. , The Imperial County Services building, a six-story reinforced concrete building located 29Â km (18Â mi) northwest of the epicenter in El Centro, was built in 1971 when there were few other tall buildings in the area. It affected Imperial Valley in Southern California and Mexicali Valley in northern Baja California. The Red Cross stated that cuts from broken glass, bruises from falling objects, and a few broken bones were reported. Several comprehensive studies on the total structural failure of this building were conducted with a focus on how the building responded to the earthquake's vibration. , The United States Geological Survey operates a series of strong motion stations in the Imperial Valley and while the majority of stations in the array recorded ground accelerations that were not unexpected, station number six registered an unusually high vertical component reading of 1.74g which, at the time, was the highest yet recorded as the result of an earthquake. The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. , An early study of the event encompassed more than 2,000 aftershocks (and included four of magnitude 5.0 or greater) that were recorded within 20 days of the mainshock, with the area south of the border near the epicenter remaining relatively quiet. The maximum observed right lateral displacement on the Imperial fault—measured within the first day of the event to the northwest of the epicenter—was 55–60 cm (22–24 in), but measurements taken five months following the earthquake closer to the southeast end of the rupture showed there was an additional 29 cm (11 in) of postseismic slip (for a total slip of 78 cm (31 in). Rupture Length: 30 km of the Imperial fault zone, 13 km of the Brawley fault zone, and 1 km of the Rico fault, Strike-slip offset of 57 centimeters on a canal on the Imperial Fault. It was later discovered that the Brawley earthquake had an aftershock zone that matched the area of the disturbances. This location is approximately the same as that of the 1940 Imperial Valley earthquake. A large pond had apparently formed near the KROP radio station's antenna site where profound liquefaction and subsidence occurred in the river valley. Page Last Modified: Tuesday, September 20, 2011, 04:12:25 PM, Download the latest version of Adobe Reader, free of charge. It affected Imperial Valley in Southern California and Mexicali Valley in northern Baja California . Four of the region's known strike-slip faults and one additional newly discovered normal fault all broke the surface during the earthquake. The decision to equip the building with nine strong motion sensors in May 1976 was based on its size, structural attributes, and location in a seismically active area. , The earthquake shaking also led to extensive damage to the irrigation systems of the Imperial Valley, leading to breaches in some canals, particularly the All-American Canal that brings water to the valley from the Colorado River. There are two main types of seismic waves: body waves and surface waves. The California Highway Patrol warned drivers that use of the road would be at their own risk.
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