Location:

Period:

3 Mar 2008 09:31:02 - 3 Mar 2008 16:29:58 (6 hours 58 minutes)

Volcanoes in 100km radius:

Prevo Peak(87km), Uratman(89km), Zavaritzki Caldera(91km), Milna(97km)

Earthquakes:

M 7.0+:

M 8.3; 2006 Kuril Islands Earthquake; (15 Nov 2006) (25km from the swarm center)

11 swarms found nearby.

2003

PS20031231.1(107.5km)

30 Dec

1 day 20 hours

8 earthquakes

2005

PS20051024.1(65.8km)

23 Oct

16 hours

5 earthquakes

2006

PS20060930.1(9.0km)

30 Sep

19 hours

15 earthquakes

PS20061013.1(29.3km)

13 Oct

8 hours

5 earthquakes

PS20061108.1(122.4km)

8 Nov

18 hours

7 earthquakes

PS20061115.1(169.0km)

15 Nov

2 days 17 hours

53 earthquakes

PS20061115.3(17.4km)

15 Nov

19 hours

11 earthquakes

PS20061120.1(104.7km)

19 Nov

1 day 1 hours

7 earthquakes

2007

PS20070113.2(109.4km)

13 Jan

7 hours

8 earthquakes

2012

PS20120714.1(142.2km)

13 Jul

20 hours

6 earthquakes

2013

PS20130604.1(199.7km)

4 Jun

14 hours

5 earthquakes

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Seismic Swarm Activity in the Kuril Islands: The March 2008 Event

The Kuril Islands form a volcanic archipelago along the Kuril-Kamchatka subduction zone, where the Pacific Plate converges with the Okhotsk Plate at rates exceeding 8 cm per year. This tectonic setting produces frequent seismic swarms and great earthquakes due to megathrust faulting and intraslab deformation. The islands sit atop one of the most active segments of the Pacific Ring of Fire, with a geologic record of repeated large-magnitude events.

On 3 March 2008, a seismic swarm occurred near the central Kuril Islands. The sequence began at 09:31 UTC and concluded at 16:29 UTC, spanning 6 hours and 58 minutes. Five events were recorded during this interval. The largest shock reached magnitude 6.5 at a depth of 10 km. Subsequent events included magnitudes of 5.2 at 42 km, 5.3 at 10 km, 5.2 at 37 km, and a final event of magnitude 0.0 at 43 km. Such swarms typically reflect localized stress adjustments along the plate interface or within the subducting slab.

The 2008 swarm took place roughly 25 km from the epicenter of the 15 November 2006 magnitude-8.3 Kuril Islands earthquake. That earlier event released substantial strain along the megathrust and was followed by an extensive aftershock sequence. Historical data since 1 January 2000 document nine swarms in the region, distributed across 2003 (one swarm), 2005 (one swarm), 2006 (six swarms), and 2007 (one swarm). These episodes illustrate episodic clustering that punctuates the background seismicity of the subduction zone.

Swarm sequences in this setting often arise from fluid migration or aseismic slip transients that modulate frictional stability on fault patches. The 2008 activity, occurring two years after the 2006 mainshock, may represent continued post-seismic relaxation. Depths ranging from 10 km to 43 km span both the shallow megathrust and deeper intraslab domains, consistent with the complex fault architecture of the Kuril arc.

Continued monitoring of swarm statistics provides insight into evolving stress conditions along this high-hazard margin. The Kuril Islands remain capable of generating great earthquakes, underscoring the importance of sustained geophysical observation.

References
SeismoSight internal swarm classification records
USGS earthquake catalog for regional historical events