Magnitude 4.0 quake near Julian, CA

Last updated: 2018-03-26 17:50:58 UTC

The Anza group at the University of California San Diego operates a broadband seismograph network consisting of 13 (+ 2) three component broadband seismograph stations centered near Anza Californa (see map).

On Saturday, March 30th, 2002 at 05:50 (PST) we recorded a quake (preliminary ml 4.0) located near the town of Julian. This earthquake was felt in the San Diego area. This is the second recent quake that has been located near Julian. Please see our special event page about an event recorded on February 3rd that was also located near Julian.

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

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

Initial source parameters for the recent event and aftershocks are shown below. The epicentral distance (distance separating the epicenter and the recording network) for ANZA is 0.199 degrees (˜22 km).

This map shows the mainshock (red circle). ANZA network stations are yellow triangles.

Global mecataor event map
Latitude Longitude Origin time (UTC) Depth ml Author
33.2045 -116.7226 3/31/2002 (089) 13:50:50.914 12.63 km 4.00* UCSD:eakins

*note that the location and magnitude determined for this event is preliminary and is subject to change upon further review of seismic data.

You may also view a plot showing:

Of local interest:

We operate a broadband station on Mt. Soledad. At 5:51:02 (PST) station SOL recorded the P wave from this event. Here is a view of that event as picked by our analyst. The red "P" indicates a P wave arrival. The vertical line labeled "Pg" is the predicted arrival time based on a standard travel time model. As the model is not specific to the Anza region, you can see that the predicted time does not match the actual arrival time.

3 component seismometer recordings at Soledad

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

Learn more about the Anza group (including who works here, other networks, nuclear tests in India and Pakistan).

Learn more about the ANZA network (includes more station information, research, etc).

URL: [Last updated: 2018-03-26 17:50:58 UTC]