Home » Special Events » Magnitude 9.1 earthquake off the west coast of Northern Sumatra, Indonesia
last updated: 12/26/04 14:52:684 (PST)
On Saturday, December 25th, 2004 at 4:58 PM (PST) we recorded a quake (preliminary Mw 9.1) located near the West Coast of Northern Sumatra.
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 USArray is 13623 km (122.44 degrees).
If you felt the quake, the USGS would like to know. Please add to the USGS "Did you feel it?" page.
View a significant (preliminary Mw 6.9) aftershock which was recorded on Friday, May 13, 2005 near El Centro.
Location Maps
The red star denotes the earthquake epicenter, the yellow triangles are active stations in the USArray deployment at the time of the earthquake. Gray lines are major roads and red lines are faults.
Global View:
Regional View:
Solution Parameters
| Solution Parameters | |
|---|---|
| Local Date: | Saturday December 25, 2004 |
| Local Time: | 4:58 PM PST |
| Universal Time: | 12/26/04 00:58:50.000 UTC |
| Magnitude: | 9.1 Mw |
| Latitude: | 3.3000 |
| Longitude: | 95.7800 |
| Depth: | 10 |
| Author: | QED_weekly |
| Authoritative: | yes |
Waveforms
You may view plots showing this event as recorded by USArray instruments:
- Vertical components for all USArray stations that recorded the event (unfiltered)
- 3 broadband, high gain (BH) components recorded by the closest USArray station to the event, HUMO (unfiltered)
- 3 long-period, high gain (LH) components recorded by the closest USArray station to the event, HUMO (filtered)
- 3 long-period, high gain (LH) components recorded by station TA109C (filtered)
- 3 long-period, high gain (LH) components recorded by station Y22 (filtered)
- Long period, high gain, vertical components (LHZ) low-pass filtered waveforms from a cross-section of USArray stations
Virtual 3-D Model
To download and view this interactive 3-D model, please visit the SIO Viz Center web page.
Proximity to Population Centers
- 250 km (155 miles) SSE of Banda Aceh, Sumatra, Indonesia
- 320 km (200 miles) W of Medan, Sumatra, Indonesia
- 1260 km (780 miles) SSW of Bankok, Thailand
- 1605 km (1000 miles) NW of Jakarta, Java, Indonesia
Informational Links
Search the internet
To search the internet for more information about this event, click on the button below:
Current seismic activity measured by USArray
Click the links below to observe near real time maps of earthquakes recorded by the USArray deployment:
Further information
Learn more about the Array Network Facility (ANF) component of USArray, the USArray experiment, the EarthScope project, and the Incorporated Research Institutions for Seismology (IRIS).
