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Location:
Kuril Islands
Period:
30 Sep 2006 17:50:23 - 1 Oct 2006 13:07:06 (19 hours 16 minutes)
Volcanoes in 100km radius:
Prevo Peak(93km), Uratman(93km), Zavaritzki Caldera(98km)
Earthquakes:
15
M 7.0+:
M 8.3; 2006 Kuril Islands Earthquake; (15 Nov 2006) (16km from the swarm center)
11 swarms found nearby.
2003
PS20031231.1(99.1km)
30 Dec
1 day 20 hours
8 earthquakes
2005
PS20051024.1(57.4km)
23 Oct
16 hours
5 earthquakes
2006
PS20061013.1(32.0km)
13 Oct
8 hours
5 earthquakes
PS20061108.1(116.2km)
8 Nov
18 hours
7 earthquakes
PS20061115.1(160.0km)
15 Nov
2 days 17 hours
53 earthquakes
PS20061115.2(193.8km)
15 Nov
1 day 19 hours
15 earthquakes
15 Nov
19 hours
11 earthquakes
PS20061120.1(97.7km)
19 Nov
1 day 1 hours
7 earthquakes
2007
PS20070113.2(104.6km)
13 Jan
7 hours
8 earthquakes
2008
3 Mar
6 hours
5 earthquakes
2012
PS20120714.1(150.0km)
13 Jul
20 hours
6 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm PS20060930.1 in the Kuril Islands

The Kuril Islands form a volcanic arc in the northwestern Pacific Ocean, extending from Hokkaido, Japan, to the Kamchatka Peninsula, Russia. This region sits at the convergent boundary where the Pacific Plate subducts beneath the Okhotsk Plate along the Kuril-Kamchatka Trench. Subduction drives intense seismic activity, frequent volcanism, and the potential for tsunamigenic events. The islands host active stratovolcanoes and experience regular earthquake swarms due to stress accumulation and release along the megathrust interface and associated crustal faults.

Seismic swarm PS20060930.1 was recorded in the Kuril Islands beginning at 17:50 on 30 September 2006 and concluding at 13:07 on 1 October 2006. Over 19 hours and 16 minutes, 15 earthquakes were detected. The sequence began with two events exceeding magnitude 6.0, followed by a series of moderate shocks clustered at shallow depths between 7 and 40 km. The full event list is as follows:

  • 30 Sep 2006 17:50:23, magnitude 6.6, depth 11 km
  • 30 Sep 2006 17:56:16, magnitude 6.0, depth 10 km
  • 30 Sep 2006 18:05:49, magnitude 4.8, depth 10 km
  • 30 Sep 2006 18:25:15, magnitude 5.1, depth 7 km
  • 30 Sep 2006 18:25:17, magnitude 5.4, depth 10 km
  • 30 Sep 2006 18:33:38, magnitude 5.5, depth 10 km
  • 1 Oct 2006 02:23:59, magnitude 5.3, depth 10 km
  • 1 Oct 2006 04:28:36, magnitude 5.2, depth 10 km
  • 1 Oct 2006 09:06:02, magnitude 6.5, depth 19 km
  • 1 Oct 2006 09:09:59, magnitude 5.4, depth 10 km
  • 1 Oct 2006 09:10:00, magnitude 5.4, depth 10 km
  • 1 Oct 2006 09:12:50, magnitude 5.1, depth 10 km
  • 1 Oct 2006 11:04:56, magnitude 5.0, depth 10 km
  • 1 Oct 2006 11:05:02, magnitude 5.1, depth 40 km
  • 1 Oct 2006 13:07:06, magnitude 5.1, depth 10 km

Since 1 January 2000, only two prior swarms have occurred in the same classification framework: one in 2003 and one in 2005. This low frequency underscores the episodic nature of swarm activity amid the region’s dominant background of isolated large events. On 15 November 2006, a magnitude 8.3 earthquake struck 16 km from the swarm center, representing one of the strongest events recorded in the area during the monitoring period.

The 2006 swarm and subsequent mainshock illustrate the dynamic stress interactions typical of subduction zones. Shallow focal depths indicate activity within the overriding plate and near the plate interface, consistent with the tectonic regime of the Kuril arc. Updated regional monitoring continues to track similar patterns, confirming the Kuril-Kamchatka zone as one of the most seismically active segments of the Pacific Ring of Fire.

References: SeismoSight internal swarm classification records USGS Earthquake Catalog for the 2006 Kuril Islands mainshock