Location:

Period:

1 Jun 2003 11:24:24 - 13 Jun 2003 00:50:39 (11 days 13 hours 26 minutes)

Volcanoes in 100km radius:

Buzzard Creek(72km)

Earthquakes:

108

M 7.0+:

M 7.9; 2002 Denali Fault, Alaska Earthquake; (3 Nov 2002) (10km from the swarm center)

25 swarms found nearby.

2002

S20021023.2(9.3km)

23 Oct

1 day 18 hours

37 earthquakes

S20021103.1(24.7km)

2 Nov

123 days 19 hours

7093 earthquakes

S20021104.2(15.9km)

3 Nov

19 days 3 hours

621 earthquakes

S20021105.2(29.5km)

4 Nov

16 days 23 hours

418 earthquakes

S20021108.1(18.7km)

7 Nov

1 day 2 hours

42 earthquakes

S20021110.1(11.4km)

9 Nov

1 day 17 hours

53 earthquakes

S20021111.1(28.1km)

10 Nov

1 day 16 hours

49 earthquakes

S20021113.1(5.1km)

12 Nov

1 day 14 hours

71 earthquakes

S20021125.1(29.2km)

24 Nov

3 days 20 hours

81 earthquakes

S20021126.1(24.9km)

25 Nov

1 day 2 hours

30 earthquakes

S20021201.1(27.4km)

30 Nov

6 days 3 hours

158 earthquakes

S20021211.1(29.2km)

10 Dec

4 days 4 hours

122 earthquakes

S20021220.2(29.8km)

20 Dec

3 days 6 hours

135 earthquakes

S20021225.1(13.5km)

24 Dec

5 days 15 hours

113 earthquakes

S20021227.1(15.1km)

26 Dec

7 days 19 hours

98 earthquakes

S20021229.1(29.7km)

28 Dec

9 days 5 hours

191 earthquakes

2003

S20030101.1(24.7km)

1 Jan

2 days 1 hours

49 earthquakes

S20030107.1(3.9km)

6 Jan

4 days 21 hours

72 earthquakes

S20030203.1(29.6km)

2 Feb

3 days 0 hours

42 earthquakes

S20030223.2(27.3km)

22 Feb

1 day 14 hours

31 earthquakes

S20030307.1(17.7km)

6 Mar

26 days 8 hours

396 earthquakes

S20030316.1(29.8km)

15 Mar

1 day 20 hours

37 earthquakes

S20030403.1(8.5km)

2 Apr

23 days 4 hours

248 earthquakes

S20030714.1(3.3km)

13 Jul

20 days 18 hours

166 earthquakes

S20030807.1(7.6km)

7 Aug

6 days 18 hours

95 earthquakes

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Seismic Analysis of Swarm S20030602.2: Denali Region, Alaska

Earthquake swarm S20030602.2 occurred approximately 74 km east-southeast of McKinley Park in Alaska's Denali region. The sequence initiated at 11:24 on 1 June 2003 and concluded at 00:50 on 13 June 2003, spanning 277 hours and 26 minutes. During this interval, 108 events were recorded, with the first 100 events providing detailed insight into the swarm's temporal and magnitude distribution.

The events exhibited low to moderate magnitudes, predominantly between 0.8 and 2.4, with the majority under 2.0. Depths remained shallow, ranging from 0 to 25 km, consistent with crustal activity in the area. Temporal clustering was evident, with higher event rates on 2 June and 8 June, including several magnitude 2.0+ shocks. Notable peaks included a 2.4 magnitude event on 5 June at 10 km depth and multiple 2.2 magnitude occurrences on 7–8 June at depths of 1–5 km. Overall, the swarm displayed a typical swarm pattern of numerous small events without a dominant mainshock.

The Denali region lies within the Alaska Range, influenced by the complex interaction between the Pacific and North American plates. The Denali Fault, a major right-lateral strike-slip structure, accommodates significant lateral motion and has hosted major historical ruptures. The 2002 Denali Fault earthquake, magnitude 7.9 on 3 November, occurred just 10 km from the swarm center, highlighting the fault's ongoing activity. Post-2002 aftershock sequences and subsequent swarms indicate continued stress adjustment along fault segments.

Since 1 January 2000, 23 swarms have been documented in the region, with 16 occurring in 2002 and 7 in 2003. These swarms reflect episodic release of strain in a tectonically active zone characterized by both strike-slip and thrust faulting. Depths under 25 km align with the brittle upper crust where most seismicity concentrates.

This swarm underscores the Denali area's persistent microseismicity. Monitoring such sequences aids in understanding fault behavior following large events like the 2002 earthquake. Continued observation remains essential for assessing regional seismic hazards.

References

Alaska Earthquake Information Center (AEIC)
U.S. Geological Survey Earthquake Hazards Program
SeismoSight internal swarm classification records