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NEES@UCSB Captures April 4 Baja Mexico Quake

Posted in Announcements

NEES@UCSB Wildlife Liquefaction Array field site obtains unique data set for the study of liquefaction from April 4 Baja Mexico earthquake.

A major earthquake occurred at 3:40:40 PM on Easter Sunday, April 4, 2010. The magnitude 7.2 event occurred 83 km (39 miles) SSE of Calexico, California, in Baja Mexico and was ~110 km (68 miles) epicentral distance from the NEES@UCSB Wildlife liquefaction Array field site. The site was fully operational, including real-time data streaming via the HPWREN wireless network.

The M7.2 event has provided a unique data set for the study of liquefaction. The peak ground acceleration recorded at the ground surface was ~0.1g. Surface waves continued to shake the Imperial Valley for several minutes after the initial arrival of the earthquake. Excess pore water pressure was observed in the liquefiable sand layer at the Wildlife site but complete liquefaction did not occur during this event due to the distance and moderate levels of ground shaking at ~10%g. The Wildlife and other sites operated by NEES@UCSB are among a handful of sites with dense instrumentation at strategic soil layer depths. The instrumentation and thorough geophysical site characterization at the sites provide a natural laboratory for testing predictive models of soil behavior and ground shaking. The data from the M7.2 event will be valuable records for improving our understanding of the physical process of pore pressure build up leading to liquefaction, and should help to improve our ability to predict the level of ground shaking where liquefaction will occur.

For more information please visit the UCSB website at this link: nees@ucsb data M7.2 event

Graphics link: April 4 Baja Mexico earthquake graphics