Location:

M 7.9 87 km SW of Sungai Penuh, Indonesia

Magnitude:

7.9

Time:

12 Sep 2007 23:49:03

Depth:

35.0

M 7.0+:

M 7.2; 164 km WSW of Sungai Penuh, Indonesia; (25 Feb 2008) (97km from the earthquake)

There are 7 swarms found nearby.

2007

PS20070912.2(53.6km)

12 Sep

1 day 15 hours

21 earthquakes

PS20070912.1(93.6km)

12 Sep

1 day 16 hours

17 earthquakes

PS20070915.1(38.2km)

15 Sep

1 day 9 hours

9 earthquakes

PS20070924.1(60.1km)

23 Sep

15 hours

8 earthquakes

PS20071021.1(97.3km)

21 Oct

3 hours

6 earthquakes

2019

PS20190202.1(83.8km)

2 Feb

4 hours

7 earthquakes

2020

PS20201019.1(76.3km)

18 Oct

17 hours

5 earthquakes

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Seismic Activity and Geology of the Sungai Penuh Region, Indonesia

The area surrounding Sungai Penuh in western Sumatra, Indonesia, lies within one of the world's most seismically active zones. On 12 September 2007 at 23:49 local time, a magnitude 7.9 earthquake struck 87 km southwest of the city at a depth of 35 km. This event forms part of a sequence of strong earthquakes recorded in the region since 2000. Geologically, Sungai Penuh sits above the Sunda megathrust, where the Indo-Australian Plate converges with and subducts beneath the Eurasian Plate at rates of approximately 5–7 cm per year. This subduction drives frequent megathrust and intraslab earthquakes along the Sumatran margin. The 2007 event occurred in the same tectonic setting that produced the devastating 2004 Indian Ocean earthquake and subsequent large events in 2005. Historical records show repeated large-magnitude earthquakes in this segment of the subduction zone. Paleoseismic studies indicate recurrence intervals of several hundred years for great earthquakes (magnitude 8+), though moderate-to-large events like the 2007 quake occur more frequently. The provided catalog of strong earthquakes since 2000 highlights two notable events near Sungai Penuh: the 12 September 2007 M7.9 mainshock and a M7.2 earthquake on 25 February 2008 located 164 km west-southwest of the city (97 km from the 2007 epicenter). These events underscore the ongoing strain accumulation and release along the plate interface. The relatively shallow depth of the 2007 earthquake contributed to its strong ground shaking felt across western Sumatra. Post-event analysis confirms that aftershocks and triggered seismicity, including the 2008 event, followed expected patterns for subduction-zone sequences. Ongoing monitoring by regional networks continues to track microseismicity and deformation in this area, providing data essential for refining seismic hazard assessments. The combination of rapid plate convergence and the presence of the Great Sumatran Fault further elevates the region's seismic risk.

References

USGS Earthquake Catalog (events 2007-09-12 M7.9 and 2008-02-25 M7.2)