Seimicity in the vicinity of Long Valley Caldera and the Mono-Inyo Craters Volcanic Chain, California

Earthquake activity in Long Valley Caldera and Vicinity

NOTE: the Long Valley seismicity maps no longer utilize a shaded-reflief base map.
Improved shaded-relief maps of the Long Valley area are available, however, from the area map webpage.

Earthquake Activity in the Long Valley area

Recent earthquakes

Last seven days
Earthquakes in the Long Valley caldera region of the eastern Sierra for the last seven days are updated within a few minutes of the most recent earthquake. This map also includes an earthquake list and a link to a map showing earthquakes for all of California for the last seven days.)

Earlier activity

Previous week
This is an 11 Kilobyte gif file showing epicenters on a black and white line map and a graph summarizing activity for the last year. The map is updated Thursday evenings between 7:00-8:00 PM).
1978-1994
This is an 105 Kilobyte gif file showing epicenters of magnitude 3 and greater earthquakes in the Long Valley caldera region from 1978 through 1994. Black dots - magnitudes 3 to 5; yellow circles - magnitudes 5 to 6; and red stars - magnitudes 6 to 6.4.

Seismic network

Earthquakes occurring in Long Valley caldera and vicinity are recorded by a network of 18 seismic stations within the caldera and an additional 20 stations within a distance of 50 km beyond the caldera boundary These stations comprise parts of both the Northern California Seismic Network (NCSN) operated by the U.S. Geological Survey in Menlo Park, CA (stations names ending in M), and the Nevada seismic network operated by the University of Nevada, Reno (station names ending in R). The signals from the combined stations are shared by both networks. The signals telemetered to USGS headquarters in Menlo Park are processed along with data from the rest of the Northern California Seismic Network and archived on a mass storage device at the University of California, Berkeley - USGS data center.

More information about earthquakes

U.S. Department of the Interior, U.S. Geological Survey, Menlo Park, California, USA
URL http://quake.wr.usgs.gov/VOLCANOES/LongValley/Seismicity.html
Contact: Long Valley Web Team
Last modification: 3 January 2000 (SRB)