Magnitude 6.4 quake off the coast of Northern California

Last updated: 2018-03-26 17:50:58 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 Thursday, June 16, 2005 at 11:21 PM (PDT) we recorded a quake (preliminary Mw 6.4) located off the coast of Northern 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 recorded 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 1158 km (10.41 degrees).

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

Event Map

Regional equidistant event map

Zoomed in Event Map

The map below is a higher resolution map of just the Northern California coast. Today's main shock (red star) and aftershocks (orange stars) are plotted alongside the June 14 2005 magnitude 7.0 event (large bright green star) and its respective aftershocks (smaller pale green stars). The closest cities in California are also plotted (Crescent City and Eureka).

Zoomed in equidistant event map

Event Parameters

Main shock in red, aftershocks in orange.

Latitude Longitude Origin time (UTC) Origin time (PDT) Depth (km) Mw Author
40.7200 -126.5400 06/17/05 (168) 06:21.42 06/16/05 (167) 11:21 PM 10 6.4* QED
40.599 -126.537 06/17/05 (168) 06:38.30 06/16/05 (167) 11:38 PM 10 3.9* QED
40.248 -124.174 06/17/05 (168) 06:38.58 06/16/05 (167) 11:39 PM 10.8 3.9* QED
40.959 -126.236 06/17/05 (168) 06:40.16 06/16/05 (167) 11:40 PM 10 4.6* QED
40.858 -126.299 06/17/05 (168) 06:41.16 06/16/05 (167) 11:41 PM 10 4.5 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 on Mt. Soledad. At 23:24 (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).

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