Location:

Period:

13 Sep 2007 15:08:54 - 14 Sep 2007 14:15:18 (23 hours 6 minutes)

Volcanoes in 100km radius:

None

Earthquakes:

M 7.0+:

M 8.4; 122 km SW of Bengkulu, Indonesia; (12 Sep 2007) (41km from the swarm center)

12 swarms found nearby.

2000

PS20000604.1(176.7km)

3 Jun

2 days 13 hours

26 earthquakes

PS20000608.1(105.0km)

7 Jun

13 hours

6 earthquakes

PS20000609.1(189.2km)

9 Jun

1 day 3 hours

8 earthquakes

2001

PS20010116.1(52.2km)

16 Jan

3 hours

7 earthquakes

PS20010214.1(187.0km)

13 Feb

9 hours

6 earthquakes

2007

PS20070912.2(131.0km)

12 Sep

1 day 15 hours

21 earthquakes

PS20070915.1(145.0km)

15 Sep

1 day 9 hours

9 earthquakes

PS20070924.1(116.6km)

23 Sep

15 hours

8 earthquakes

PS20071021.1(83.0km)

21 Oct

3 hours

6 earthquakes

2010

PS20101025.1(165.7km)

25 Oct

1 day 13 hours

14 earthquakes

2019

PS20190202.1(178.8km)

2 Feb

4 hours

7 earthquakes

2020

PS20201019.1(124.4km)

18 Oct

17 hours

5 earthquakes

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Seismic Swarm PS20070914.1: Analysis of Activity near Bengkulu, Indonesia

A seismic swarm designated PS20070914.1 occurred approximately 132 km west of Bengkulu, Indonesia, from 15:08 on 13 September 2007 to 14:15 on 14 September 2007. Over 23 hours and 6 minutes, the sequence registered six earthquakes. This event followed a magnitude 8.4 earthquake on 12 September 2007 located 122 km southwest of Bengkulu, with the swarm center situated 41 km from that mainshock epicenter.

The swarm events unfolded as follows. The first earthquake occurred at 15:08:54 on 13 September 2007 with a magnitude of 5.2 at a depth of 24 km. Subsequent activity included a magnitude 5.4 event at 01:02:05 on 14 September at 26 km depth. The largest shock registered magnitude 6.4 at 06:01:32 on 14 September at 23 km depth, followed closely by a magnitude 5.8 event at 06:03:16 at 25 km depth. Later events comprised a magnitude 0.0 shock at 12:34:59 at 35 km depth and a final magnitude 5.1 earthquake at 14:15:18 at 35 km depth.

Bengkulu lies along the western margin of Sumatra within the Sunda subduction zone, where the Indo-Australian plate converges with the Eurasian plate at rates of approximately 5–6 cm per year. This tectonic setting produces frequent seismicity, including megathrust events and associated swarms along the Sumatran fault system and forearc regions. The area has a documented history of clustered seismic activity, with six swarms recorded since 1 January 2000. Prior episodes occurred in 2000 (three swarms) and 2001 (two swarms), followed by this 2007 sequence.

Such swarms often reflect stress redistribution after major subduction-zone ruptures. The timing of PS20070914.1 immediately after the 12 September 2007 mainshock suggests a possible link to post-seismic adjustment along nearby fault segments. Depths ranging from 23 to 35 km align with typical megathrust interface conditions in this segment of the Sunda Arc.

Regional monitoring indicates ongoing seismic hazard in western Sumatra due to locked portions of the subduction interface capable of generating large events. Historical patterns underscore the importance of continuous observation for understanding swarm dynamics and their relation to larger tectonic processes.

References
SeismoSight internal swarm classification records (PS20070914.1 parameters and historical statistics).
USGS Earthquake Catalog (regional tectonics and 2007 mainshock context).