This event has been reviewed by a seismologist.

Magnitude: 7.7
Date-Time:

• Monday, October 25, 2010 at 14:42:22 UTC
• Monday, October 25, 2010 at 09:42:22 PM at epicenter

Location: 3.484°S, 100.114°E
Depth: 20.6 km (12.8 miles)
Region: KEPULAUAN MENTAWAI REGION, INDONESIA
Distances:

• 240 km (150 miles) W of Bengkulu, Sumatra, Indonesia
• 280 km (175 miles) S of Padang, Sumatra, Indonesia
• 305 km (190 miles) W of Lubuklinggau, Sumatra, Indonesia
• 795 km (500 miles) WNW of JAKARTA, Java, Indonesia

Location Uncertainty: horizontal +/- 5.3 km (3.3 miles); depth +/- 3.4 km (2.1 miles)
Parameters:

• NST=297, Nph=297, Dmin=330.2 km, Rmss=1.16 sec, Gp= 22°,
• M-type=surface wave magnitude (Ms), Version=V

Source: USGS NEIC (WDCS-D)
Event ID: usa00043nx

Felt ReportsAt least 340 people killed and 330 missing from the earthquake and tsunami with maximum heightof 7meters. Felt (III) at Bukittinggi and Padang, Sumatra. Also felt at Bengkulu. Felt (II) inSingapore. Felt at Bangkok, Thailand.

Tectonic Summary 

The Pulau Pagai Selatan, Sumatra earthquake of October 25, 2010 occurred as a result of thrust faulting on or near the subduction interface plate boundary between the Australia and Sunda plates. At the location of this earthquake, the Australia Plate move north-northeast with respect to the Sunda plate at a velocity of approximately 57-69 mm/yr. On the basis of the currently available fault mechanism information and earthquake depth it is likely that this earthquake occurred along the plate interface. The subduction zone adjacent to the region of this event last slipped during the Mw 8.5 and 7.9 earthquakes of September 2007, and today’s event appears to have occurred near the rupture zones of those earthquakes. Today’s earthquake is the latest in a sequence of large ruptures along the Sunda megathrust, including a M 9.1 earthquake that ruptured to within 800 km north of this earthquake in 2004; a M 8.6 700 km to the north between Nias and Simeulue in 2005; and a M 7.5 300 km to the north near Padang in 2009. Today’s earthquake occurred near the southern edge of a Mw 8.7-8.9 rupture in 1797 and within the rupture area of a Mw 8.9-9.1 earthquake in 1833.

Earthquake Summary Poster 
Poster of the Kepulauan Mentawai, Indonesia Earthquake of 25 October 2010 – Magnitude 7.7
Download PDF or JPG  Low | Medium | High

The posters may be downloaded for viewing or for printing on a color plotter. Adobe PDF (.pdf) format files are provided. Adobe Acrobat 6.0 or higher is required for viewing the PDF file on a computer monitor and for printing the PDF map graphic.
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Maps

Did you feel it?

Downloads

City map JPG | PDF | PS
Map of responses by city or ZIP code

Intensity vs. Distance JPG | PS
Plot of Attenuation (fall-off) with distance for each intensity versus its distance from the epicenter

Responses vs. Time JPG | PS
Plot of total number of responses since the event

Product List XML
List of available DYFI maps and data for this event

Intensity Summary TXT | XML
Table of intensities aggregated by city or ZIP code

PAGER – M 7.7 – KEPULAUAN MENTAWAI REGION, INDONESIA

Alert Level: GREEN | Download Alert PDF

Monday, October 25th, 2010 at 14:42:22 UTC (21:42:22 local)

Location: 3.5° S, 100.1° E

Depth: 20km

Event Id: USA00043NX

Alert Version: 12

Created: 1 day, 5 hours after earthquake.

Population per ~1 sq. km. from LandScan

Result of the Oct 25, 2010 Mw 7.7 Southern Sumatra Earthquake, by Gavin Hayes, NEIC. Download PDF

QuickTime* animations:
Viewpoint looks to the northwest.
The first 60 minutes of propagation is shown.

• Small version
  view in web page; or
  download .mov file (9.3 MB; Mac: click and hold mouse button; Windows: right-click)
• Large version
  view in web page; or
  download .mov file (32.9 MB; Mac: click and hold mouse button; Windows: right-click)