Magnitude 8.7 earthquake near Sibolga, Sumatra, Indonesia

last updated: 03/29/05 09:28:000 (PST)

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Location map Initial source parameters 3 components closest IDA station, COCO 3 components next closest IDA station, PALK 3 components 3rd closest IDA station, DGAR All IDA stations, vertical components, filtered Plot of IDA stations as a function of distance. This is lowpassed filtered at 35 seconds, vertical components
Translations

Project IDA is a global network of broadband and very long period seismometers operated by the Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California San Diego. IDA stations and similarly-equipped stations operated by the US Geological Survey comprise the IRIS Global Seismic Network, which is supported by funding from the US National Science Foundation.

On Monday March 28th, 2005 at 16:09.37 (GMT) we recorded a quake (preliminary Mw 8.7) located near Sibolga, Sumatra, Indonesia.

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

Initial source parameters for the recent event are shown below. The epicentral distance (distance separating the epicenter and the closest station that reports in real time) for station COCO of the IDA network is 1579.325 km (14.187 degrees).

Location Maps

This map shows the location of the mainshock (red star). IDA network stations are yellow triangles.

Event Map - Global View

Event Map - Regional View

This map shows the three nearest stations in the IRIS/IDA Global Seismic Network (GSN) (yellow triangles) to the epicenter (red star) and the December 26th, 2004 magnitude 9.0 earthquake (dark red star). Placing the cursor over each station pops up a box that shows the station name. Clicking the station shows the waveforms recorded at that station.

Event Parameters

* 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:

• the 3 components recorded by the closest IDA station, COCO
• the 3 components recorded by the next closest IDA station, PALK
• the 3 components recorded by the 3rd closest IDA station, DGAR
• All IDA stations, vertical components
• Plot of IDA stations as a function of distance. This is lowpassed filtered at 35 seconds, vertical components

You may also watch movies of waveforms recorded at:

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

The USGS website has comprehensive information about this event.

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