Magnitude 9.0 quake off the west coast of Northern Sumatra

last updated: 01/04/05 04:33:000 (GMT)

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Location map Initial source parameters 3 components [closest IDA station, COCO, clipped] 3 components [closest IDA station, COCO, non-clipped] 3 components [next closest IDA station, PALK, non-clipped] 3 components [3rd closest IDA station, DGAR, non-clipped] All IDA stations, vertical components, filtered All IDA stations, vertical components, low pass fliter Plot showing the accelerations observed at IRIS/IDA stations COCO and PALK superimposed on a figure depicting expected ground accelrations for varying distances and sizes of earthquake. Record of the tsunami as measured by the SIO Coastal Data Information Program (CDIP) from sensors at the end of the SIO pier
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 Sunday, December 26th, 2004 at 12:58 AM (GMT) we recorded a quake (preliminary Mw 9.0) located near the west coast of Sumatra.

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 1718 km (15.43 degrees).

Location Maps

This map shows the mainshock (red star) and any associated aftershocks (orange stars). 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). 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 (CLIPPED)
• the 3 components recorded by the closest IDA station, COCO (NON-CLIPPED)
• the 3 components recorded by the next closest IDA station, PALK (NON-CLIPPED)
• the 3 components recorded by the 3rd closest IDA station, DGAR (NON-CLIPPED)
• All IDA stations, vertical components, filtered
• All IDA stations, vertical components, low pass fliter
• Plot showing the accelerations observed at IRIS/IDA stations COCO and PALK superimposed on a figure depicting expected ground accelrations for varying distances and sizes of earthquake.

You may also watch movies of waveforms recorded at:

• All IDA stations, vertical components, filtered - LARGE, 50.7 MB or SMALL, 15.4 MB (Quicktime format)
• The closest IDA station, COCO, 3 components, filtered - Quicktime format, 31.8 MB or MPEG4 format, 45.6 MB

Download data: CSS3.0 database tables and miniSEED waveform data for all IDA II stations available in real-time

Record of the tsunami as measured by the SIO Coastal Data Information Program (CDIP) from sensors at the end of the SIO pier

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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