Magnitude 6.6 quake near the west coast of Honshu, Japan

Last updated: 2015-10-22 22:34:38 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 Saturday, October 23rd, 2004 at 1:56 AM (PDT) we recorded a quake (preliminary Mw 6.6) located near th west coast of Honshu, Japan.

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 8929 km (80.29 degrees).

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

Event Map

Global mecator event map

Event Parameters

Latitude Longitude Origin time (UTC) Origin time (PDT) Depth (km) Mw Author
37.229 138.773 10/23/04 (297) 8:56 AM 10/23/04 (297) 1:56 AM 16 6.6 USGS
37.321 138.828 10/23/04 (297) 9:03 AM 10/23/04 (297) 2:03 AM 10 6.0 USGS
37.198 138.692 10/23/04 (297) 9:11 AM 10/23/04 (297) 2:11 AM 10 5.7 USGS
37.280 138.787 10/23/04 (297) 9:34 AM 10/23/04 (297) 2:34 AM 22 6.3 USGS
37.214 138.602 10/23/04 (297) 10:37 AM 10/23/04 (297) 3:37 AM 15 5.5 USGS
37.300 138.608 10/23/04 (297) 10:45 AM 10/23/04 (297) 3:45 AM 14 5.9 USGS
37.264 138.665 10/23/04 (297) 2:35 PM 10/23/04 (297) 7:35 AM 20 5.2 USGS
37.233 138.669 10/24/04 (298) 5:22 AM 10/23/04 (297) 10:22 PM 10 5.1 USGS
37.197 138.620 10/24/04 (298) 3:28 PM 10/24/04 (298) 8:28 AM 10 5.3 USGS
37.308 138.621 10/24/04 (298) 9:05 PM 10/24/04 (298) 2:05 PM 17 5.7 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 02:08 (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).

URL: http://eqinfo.ucsd.edu/special_events/2004/297/a/index.php [Last updated: 2015-10-22 22:34:38 UTC]