Location:

Period:

14 Jun 2006 04:18:42 - 14 Jun 2006 05:26:06 (1 hour 7 minutes)

Volcanoes in 100km radius:

Kiska(41km), Segula(74km), Davidof(87km), Buldir(91km)

Earthquakes:

M 7.0+:

M 7.1; Rat Islands, Aleutian Islands, Alaska; (17 Mar 2003) (97km from the swarm center)

19 swarms found nearby.

2003

PS20030317.1(98.4km)

17 Mar

5 hours

7 earthquakes

PS20031117.1(130.8km)

17 Nov

1 day 5 hours

18 earthquakes

2005

PS20050614.1(195.0km)

14 Jun

14 hours

7 earthquakes

2006

S20060614.2(16.7km)

14 Jun

18 days 19 hours

1106 earthquakes

S20060614.1(27.2km)

14 Jun

1 day 1 hours

136 earthquakes

S20060614.3(27.3km)

14 Jun

3 days 7 hours

62 earthquakes

2014

PS20140623.2(95.8km)

23 Jun

1 day 3 hours

11 earthquakes

S20140623.2(94.8km)

23 Jun

26 days 6 hours

992 earthquakes

S20140624.3(88.6km)

23 Jun

7 days 20 hours

135 earthquakes

S20140624.4(110.8km)

23 Jun

6 days 8 hours

79 earthquakes

S20140624.5(76.6km)

23 Jun

2 days 11 hours

33 earthquakes

S20140624.2(36.2km)

24 Jun

18 hours

33 earthquakes

2021

S20210622.3(95.3km)

22 Jun

1 day 2 hours

48 earthquakes

S20210711.2(23.6km)

10 Jul

1 day 12 hours

37 earthquakes

VS20211210.1(89.6km)

9 Dec

2 days 12 hours

55 earthquakes

2022

VS20220126.1(88.7km)

25 Jan

3 days 9 hours

91 earthquakes

S20220605.1(87.9km)

4 Jun

4 days 0 hours

74 earthquakes

2023

S20230609.1(42.8km)

8 Jun

2 days 5 hours

38 earthquakes

2024

VS20240610.1(100.0km)

9 Jun

3 days 5 hours

85 earthquakes

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Seismic Swarm PS20060614.1: Analysis of the June 2006 Event near Attu Station, Alaska

The seismic swarm designated PS20060614.1 occurred on 14 June 2006 in the Aleutian Islands region of Alaska, approximately 285 km east-southeast of Attu Station. The sequence began at 04:18 UTC and concluded at 05:26 UTC, encompassing five earthquakes within a span of one hour and seven minutes. This cluster highlights the persistent tectonic activity characteristic of the western Aleutians.

The recorded events exhibited the following parameters: a magnitude 6.5 earthquake at 04:18:42 UTC with a focal depth of 14 km; a magnitude 5.4 event at 04:45:42 UTC at 4 km depth; a magnitude 6.0 earthquake at 04:46:42 UTC at 29 km depth; a magnitude 2.7 shock at 05:00:42 UTC at 10 km depth; and a magnitude 5.3 earthquake at 05:26:06 UTC at 7 km depth. Depths ranged from shallow crustal levels to nearly 30 km, consistent with subduction-related faulting.

Geologically, the swarm location lies along the Aleutian subduction zone, where the Pacific Plate converges with and descends beneath the North American Plate at rates exceeding 6 cm per year. This margin forms part of the Pacific Ring of Fire and produces frequent seismic sequences due to megathrust and intraslab faulting. The Aleutian arc has a well-documented history of large-magnitude earthquakes and associated volcanic activity driven by fluid release and partial melting in the subducting slab.

Historical records since 1 January 2000 indicate three prior swarms in the immediate vicinity: two in 2003 and one in 2005. A magnitude 7.1 earthquake struck the Rat Islands segment of the Aleutian chain on 17 March 2003, with its epicenter located 97 km from the center of the 2006 swarm. Such proximity underscores the interconnected nature of seismic clusters along this plate boundary.

Seismic swarms in subduction settings often reflect episodic slip on faults or fluid migration rather than a single mainshock-aftershock sequence. The 2006 event, with its rapid succession of moderate-to-strong shocks, aligns with patterns observed in the western Aleutians, where the plate interface experiences both locked and creeping segments.

References

SeismoSight internal swarm classification data (PS20060614.1)
USGS Earthquake Catalog (historical events since 2000)