Magnitude 5.5 quake and aftershock swarm in Central California
Last updated: 2015-10-22 22:34:38 UTC
- Location map
- Initial source parameters
- 3 components [closest Anza station]
- Vertical components [all Anza stations]
- Waveforms recorded at Mt. Soledad
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 Saturday, September 18th, 2004 at 4:02 PM (PDT) we recorded a quake (preliminary mb 5.5) located in Central California.
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 464 km (4.17 degrees).
This map shows the mainshock (red star) and any associated aftershocks (orange stars). Anza network stations are yellow triangles.
As of 9/19/04 5:00 pm (PDT) there have been 481 aftershocks related to this event. The table below only shows those events that are magnitude 3.0 and greater.
|Latitude||Longitude||Origin time (UTC)||Origin time (PDT)||Depth (km)||mb||Author|
|38.01||-118.68||9/18/04 (262) 23:02||9/18/04 (262) 16:02||8||5.5||USGS|
|38.01||-118.67||9/18/04 (262) 23:09||9/18/04 (262) 16:09||6||3.1||USGS|
|38.01||-118.69||9/18/04 (262) 23:36||9/18/04 (262) 16:36||5||3.3||USGS|
|38.01||-118.68||9/18/04 (262) 23:41||9/18/04 (262) 16:41||6||3.0||USGS|
|38.01||-118.67||9/18/04 (262) 23:44||9/18/04 (262) 16:44||11||5.4||USGS|
|38.02||-118.65||9/18/04 (262) 23:48||9/18/04 (262) 16:48||4||4.1||USGS|
|38.01||-118.68||9/19/04 (263) 00:02||9/18/04 (262) 17:02||12||3.5||USGS|
|38.03||-118.64||9/19/04 (263) 00:08||9/18/04 (262) 17:08||7||3.0||USGS|
|38.03||-118.65||9/19/04 (263) 01:27||9/18/04 (262) 18:27||8||3.2||USGS|
|38.02||-118.65||9/19/04 (263) 01:27||9/18/04 (262) 18:27||11||3.5||USGS|
|38.00||-118.68||9/19/04 (263) 03:16||9/18/04 (262) 20:16||1||3.4||USGS|
|38.03||-118.46||9/19/04 (263) 03:27||9/18/04 (262) 20:27||0||3.1||USGS|
|38.01||-118.67||9/19/04 (263) 04:52||9/18/04 (262) 21:52||9||3.4||USGS|
|38.01||-118.68||9/19/04 (263) 06:58||9/18/04 (262) 23:58||4||3.9||USGS|
|38.01||-118.67||9/19/04 (263) 12:07||9/19/04 (263) 05:07||10||3.0||USGS|
|38.00||-118.69||9/19/04 (263) 13:30||9/19/04 (263) 06:30||6||3.0||USGS|
|38.00||-118.68||9/20/04 (264) 11:20||9/20/04 (264) 04:20||7||3.0||USGS|
|38.03||-118.64||09/20/04 (264) 16:51||09/20/04 (264) 09:51||5||4.8||USGS|
* 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 on Mt. Soledad. At (no arrival time recorded) 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.
Visit the IRIS website with additional links to seismic data for this event.
Search the Internet
To search the internet for more information about this event, click on the button below:
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/2004/262/a/index.php [Last updated: 2015-10-22 22:34:38 UTC]