Magnitude 6.5 quake near the city of Fes, Morocco

Last updated: 2018-03-26 17:50:55 UTC

Global view of quake


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 23rd, 2004 at 6:40 PM (PST) we recorded a quake (preliminary mb 6.5) located near the city of Fes, Morocco.

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 station HWB in the recording network) for Anza is ~9736. km ( ~87.5 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 (PST) Depth (km) ms Author
35.235 -3.963 02/24/04 (055) 02:27 02/23/04 (054) 18:27 1.7 6.5* USGS

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

Important Note

Due to strong electrical storms in the Anza-Borrego region of San Diego we have not been receiving realtime data from many of the Anza broadband stations since Saturday February 21st, 2004 due to one of our relay stations being struck by lightning.
Click here to see a photo taken in the afternoon of Wednesday 18 February 2004 that shows one of the Anza stations being struck by lightning (photo courtesy and © of

You may also view a plot showing

Of local interest:
We operate a broadband station on Mt. Soledad. At 18:40 (PST) station SOL recorded the S 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 Soledad

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

Visit the IRIS website and the USGS 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).

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