Press Releases

High-tech Earthquake Monitoring Instruments Reveal Expansion of San Gabriel Valley After Heavy Rainf

New and intriguing information identified by the U.S. Geological Survey (USGS) and its partners has been published in the Journal of Geophysical Research. For the first time, researchers have identified large-scale surface uplift and expansion in the San Gabriel Valley directly caused by groundwater recharge, due to near-record rainfall in 2004-2005. The San Gabriel Valley rose almost 2 inches (47 mm) in less than four months, and the margins of the basin were pushed outward by almost half an inch (10 mm). The expansion was five times larger than slight oscillations observed since 1998.

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Press Releases

Corps of Engineers Revises and Renews Nationwide Permits

WASHINGTON, DC – The U.S. Army Corps of Engineers has revised and renewed the nationwide permits for regulating work in wetlands and other waters of the United States under Section 404 of the Clean Water Act and Section 10 of the Rivers and Harbors Act of 1899.

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