Magnitude 5.1 quake near Loreto, Baja California Sur, Mexico

Last updated: 2018-03-26 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 Monday, February 9th, 2004 at 1:03 AM (PST) we recorded a quake (preliminary mb 5.1) located near the city of Loreto.

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

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

Initial source parameters for the recent event are shown below. The epicentral distance (distance separating the epicenter and the closest station in the recording network) for Anza is 979 km (8.80 degrees).

This map shows the mainshock (red star) and any associated aftershocks (orange stars). Anza network stations are blue triangles.

Global mecator event map

Latitude	Longitude	Origin time (UTC)	Origin time (PDT)	Depth (km)	mb	Author
24.7500	-112.5300	2/09/04 (040) 09:03	2/09/04 (040) 01:03	10	5.1*	QED

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

You may also view a plot showing

Of local interest:
We operate a broadband station at Piñon Flats Observatory. At 01:06 station PFO recorded the P wave from this event. Here is a view of that event as picked by our analyst. A pink "P" indicates a P wave arrival, a pink "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).

URL: http://eqinfo.ucsd.edu/special_events/2004/040/a/index.php [Last updated: 2018-03-26 17:50:55 UTC]