Magnitude Mw 7.2 (ml 6.9) quake near Guadalupe Victoria, Baja California Norte, Mexico

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 Sunday April 4 2010 at 3:40 PM (PDT) we recorded an earthquake (preliminary Mw 7.2, ml 6.9) located near Guadalupe Victoria, Baja California Norte, Mexico. Many network stations, including Monument Peak (MONP2) - the closest station to the event - have their waveforms clipped due to the large magnitude of this event. Click here to learn why different magnitudes and different magnitude scales are used for earthquake solution calculations. Typically, for larger magnitude events, the Mw scale is the better magnitude scale to use.

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 141 km (1.27 degrees).

This map shows the mainshock as a red star. Other epicentral solutions 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

Global mecator event map

Event Parameters

The first solution listed is provided by Caltech. The second solution listed is provided by the Anza network.

Latitude Longitude Origin time (UTC) Origin time (PDT) Depth (km) ml Mw Algorithm Author
32.2950 -115.2740 04/04/10 (094) 22:40.42 04/04/10 (094) 3:40 PM 6.0 6.9 7.2 – CICESE
32.5027 -115.5575 04/04/10 (094) 22:43.75 04/04/10 (094) 3:43 PM 6.0 6.9 7.2 locsat:iasp91 UCSD:rt

* 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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Interactive Google Earth mapping interface

Use the interactive map below to explore the main shock and associated aftershocks in the region. Click here to learn how to use the Google Earth browser plugin.

Download Google Earth file

Click to download a Google Earth KMZ file of this event

Of local interest

We operate a broadband station on Mt. Soledad. At 15:41 (PDT) station SOL 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 Soledad

View a larger image showing the waveforms recorded at Mt. Soledad.

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).