June 24, 2010
The magnitude 7.2 El Mayor-Cucapah earthquake of Sunday April 4, 2010 was the strongest earthquake to strike the Imperial Valley region since 1892. The earthquake occurred at shallow depth along a series of strike-slip faults in northern Baja California. Similar to the nearby San Andreas Fault, which lies a short distance to the northeast, these faults form part of the North America-Pacific plate boundary. The earthquake was accompanied by strong, long duration ground shaking (about 30 seconds), resulted in significant damage to the agricultural infrastructure in the region, and was accompanied by a wide variety of associated geological phenomena, including surface fault rupture, liquefaction, lateral spreading, embankment failure, and other forms of permanent ground deformation.
Read Exponent's E-Alert on the earthquake.
Engineers and geologists from Exponent’s Civil and Buildings & Structures practices visited both sides of the international border to assess impacts to infrastructure and document the geological phenomena that resulted from the earthquake.
Read more about the earthquake, the lessons learned, and Exponent's earthquake reconnaissance efforts.