Magnitude 8.4 quake in southern Sumatra, Indonesia

Last updated: 2018-03-26 (84) 17:50:56 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 Wednesday September 12 2007 at 4:10 AM (PDT) we recorded an earthquake (preliminary Mw 8.4) located in southern Sumatra.

If you have felt this quake, the USGS would like to know. Please add your comments to the USGS page "Did you feel it?".

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 recorded by ANZA from around the globe.

Initial source parameters for this tremor are indicated below. The epicentral distance (i.e. the distance separating the epicenter and the closest station in the recording network) for Anza is 14915 km (134.00 degrees).

This map shows the mainshock as a red star. Associated aftershocks are orange stars. Anza network stations are yellow triangles. Gray lines are major rivers.

Event Map

Global mecator event map

Event Detail

Detail map of region

Regional View with Historical Events:

The map below shows the current event (large red star) in relation to major cities in the region. Smaller darker-red stars represent the recent large earthquakes in the region: the June 2000 magnitude 7.9, the December 2004 magnitude 9.1 and the March 2005 magnitude 8.6.

Historical map view

Event Parameters

Latitude Longitude Origin time (UTC) Origin time (PDT) Depth (km) Mw Author
-4.5170 101.3820 09/12/07 (255) 11:10.26 09/12/07 (255) 4:10 AM 30 8.4 QED

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

An earthquake occurred in Southern California about 20 minutes after this event. Consequently, the waveforms recorded at Anza stations consist of both events. Please bear this in mind when studying the plots below.

You may also view a plot showing

Of local interest:

We operate a broadband station on Mt. Soledad. At 04:29 (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.

Virtual 3-D Model

Indonesia Multiple Quake Model Screendump

To download and view this interactive 3-D model, please visit the SIO Viz Center web page.

Visit the IRIS website with additional links to seismic data for this event.

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