Magnitude 7.0 quake near the Ryukyu Islands, Japan

Last updated: 2018-03-26 (84) 17:50:55 UTC

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The Anza group at the University of California San Diego operates a broadband seismograph network consisting of 17 three component broadband seismograph stations centered near Anza, California (see map).

On Friday February 26 2010 at 12:31 PM (PST) we recorded an earthquake (preliminary Mw 7.0) located near the Ryukyu Islands, Japan.

If you have felt this quake, the USGS would like to know. Please add your comments to the USGS page "Did you feel it?".

View the most recent map of local events near San Diego or a slightly wider regional view of events recorded by ANZA, or a map of events recorded by ANZA from around the globe.

Initial source parameters for this tremor are indicated below. The epicentral distance (i.e. the distance separating the epicenter and the closest station in the recording network) for Anza is 10476 km (94.18 degrees).

This map shows the mainshock as a red star. Associated aftershocks are orange stars. Anza network stations are yellow triangles. Blue lines are major rivers. Thin black lines are state boundaries and thick black lines are national boundaries.

Event Map

Event Parameters

Latitude	Longitude	Origin time (UTC)	Origin time (PST)	Depth (km)	Mw	Author
25.9020	128.4170	02/26/10 (057) 20:31.27	02/26/10 (057) 12:31 PM	22	7.0	QED

* The location and magnitude determined for this event are preliminary and are subject to change upon further review of seismic data.

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Of local interest

We operate a broadband station at Piñon Flats Observatory. At 12:44 (PST) station PFO recorded the P wave from this event. Here is a view of that event as picked by our analyst. A red P indicates a P wave arrival, a red S indicates an S wave arrival.

3 component seismometer recordings at Piñon Flats Observatory

View a larger image showing the waveforms recorded at Piñon Flats Observatory.

Visit the IRIS website with additional links to seismic data for this event.

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Learn more about the Anza group (including who works here, other networks, nuclear tests in China/India/Pakistan).
Learn more about the ANZA network (includes more station information, research, etc).