Earthquakes
Earthquakes
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Earthquake Hazards 201 - Technical Q&A
A list of technical questions & answers about earthquake hazards.
Earthquake Hazards 101 - the Basics
What is earthquake hazard? Earthquake ground shaking varies from place to place and the hazard mapping in this project will show this variability. The mapped hazard refers to an estimate of the probability of exceeding a certain amount of ground shaking, or ground motion, in 50 years. The hazard depends on the magnitudes and locations of likely earthquakes, how often they occur, and the properties...
M7.9 1857 Fort Tejon Earthquake
The Last "Big One" in Southern California.
M6.9 October 17, 1989 Loma Prieta Earthquake
On October 17, 1989, at 5:04:15 p.m. (PDT), a magnitude 6.9 earthquake severely shook the San Francisco and Monterey Bay regions. The epicenter was located near Loma Prieta peak in the Santa Cruz Mountains, approximately 14 km (9 mi) northeast of Santa Cruz and 96 km (60 mi) south-southeast of San Francisco.
M5.8 August 23, 2011 Mineral, Virginia
On August 23, 2011 tens of millions of people along the East Coast suddenly felt the earth shaking from the largest earthquake in the eastern U.S. since the M5.8 earthquake in 1944 near Cornwall and Massena, New York.
M5.3 2017 Soda Springs, Idaho Sequence
- last updated September 27, 2017 1:40 PST
February 2018 Danville, California Sequence
Mon Mar 5, 7:30pm PT The earthquake swarm near Danville had continued to taper off over the past week. Since Feb 23 there have only been two earthquakes in the sequence larger than magnitude 2.0, a magnitude 2.0 on Feb 27 and a magnitude 2.5 on Mar 1. The most likely scenario looking forward is for this sequence to continue to taper off.