Location:

3 km ESE of Hebgen Lake Estates, Montana

Period:

4 Mar 2025 02:21:05 - 4 Mar 2025 14:34:11 (12 hours 13 minutes)

Volcanoes in 100km radius:

None

Earthquakes:

89 swarms found nearby.

2000

S20000125.1(8.9km)

25 Jan

1 day 8 hours

67 earthquakes

S20000329.2(9.0km)

29 Mar

9 days 3 hours

185 earthquakes

S20000409.1(9.2km)

8 Apr

1 day 23 hours

41 earthquakes

S20000526.1(28.6km)

26 May

23 hours

25 earthquakes

S20000728.1(26.9km)

27 Jul

5 days 11 hours

144 earthquakes

S20001025.1(3.2km)

25 Oct

2 days 15 hours

52 earthquakes

S20001124.1(25.4km)

23 Nov

3 days 8 hours

120 earthquakes

S20001224.1(21.1km)

23 Dec

4 days 11 hours

64 earthquakes

2001

S20010119.1(11.4km)

18 Jan

4 days 18 hours

341 earthquakes

S20010227.1(8.3km)

26 Feb

2 days 5 hours

56 earthquakes

S20011202.1(8.5km)

2 Dec

5 days 0 hours

131 earthquakes

S20011209.3(4.3km)

8 Dec

19 days 5 hours

335 earthquakes

2002

S20020130.2(13.5km)

30 Jan

2 days 22 hours

52 earthquakes

S20021104.1(12.9km)

3 Nov

4 days 4 hours

118 earthquakes

S20021104.5(8.1km)

3 Nov

3 days 12 hours

80 earthquakes

S20021205.1(13.8km)

5 Dec

2 days 12 hours

405 earthquakes

S20021214.1(10.2km)

13 Dec

1 day 12 hours

26 earthquakes

2003

S20030103.2(23.4km)

3 Jan

4 days 3 hours

75 earthquakes

S20030131.1(24.5km)

31 Jan

1 day 15 hours

36 earthquakes

S20030206.1(5.5km)

5 Feb

1 day 18 hours

42 earthquakes

2004

S20040413.1(13.1km)

13 Apr

6 days 22 hours

457 earthquakes

S20040717.1(6.9km)

16 Jul

1 day 16 hours

38 earthquakes

2005

S20050604.1(3.6km)

3 Jun

2 days 8 hours

49 earthquakes

2006

S20060222.1(26.1km)

22 Feb

15 hours

44 earthquakes

S20060613.1(22.8km)

12 Jun

1 day 14 hours

45 earthquakes

S20060618.1(6.2km)

18 Jun

1 day 11 hours

57 earthquakes

S20061015.1(25.9km)

14 Oct

19 hours

79 earthquakes

S20061105.1(29.1km)

4 Nov

1 day 14 hours

46 earthquakes

2007

S20070620.1(23.4km)

20 Jun

1 hours

26 earthquakes

S20071214.1(3.1km)

14 Dec

22 hours

28 earthquakes

S20071231.1(14.3km)

30 Dec

3 days 10 hours

61 earthquakes

2008

S20080109.1(13.7km)

9 Jan

4 days 20 hours

89 earthquakes

S20080203.1(24.2km)

3 Feb

21 hours

47 earthquakes

S20080311.1(26.7km)

11 Mar

2 days 13 hours

69 earthquakes

S20080729.1(23.5km)

28 Jul

4 days 18 hours

189 earthquakes

S20080807.1(20.4km)

7 Aug

6 hours

32 earthquakes

S20081203.1(3.8km)

3 Dec

6 days 17 hours

213 earthquakes

2009

S20090417.1(3.5km)

16 Apr

5 days 18 hours

136 earthquakes

S20090525.1(27.6km)

25 May

10 hours

70 earthquakes

S20090630.1(25.0km)

30 Jun

1 day 12 hours

34 earthquakes

S20090913.1(1.1km)

12 Sep

21 hours

24 earthquakes

S20090916.1(4.0km)

16 Sep

1 day 7 hours

28 earthquakes

2010

S20100117.1(21.6km)

16 Jan

19 days 8 hours

2268 earthquakes

2011

S20110504.1(3.6km)

3 May

1 day 22 hours

33 earthquakes

2013

S20130507.1(20.7km)

7 May

22 hours

34 earthquakes

S20130630.1(1.5km)

29 Jun

3 days 16 hours

79 earthquakes

S20130713.1(14.2km)

13 Jul

19 hours

30 earthquakes

SVS20130913.1(27.7km)

13 Sep

4 days 4 hours

243 earthquakes

S20130928.1(4.2km)

27 Sep

1 day 12 hours

28 earthquakes

S20131005.1(28.4km)

5 Oct

7 hours

54 earthquakes

S20131123.1(6.7km)

23 Nov

6 days 16 hours

223 earthquakes

2014

S20140122.1(22.6km)

21 Jan

2 days 1 hours

46 earthquakes

S20140217.1(29.2km)

16 Feb

3 days 7 hours

52 earthquakes

S20140330.1(29.2km)

29 Mar

3 days 19 hours

194 earthquakes

S20140601.1(28.1km)

31 May

6 days 5 hours

232 earthquakes

S20140819.4(8.4km)

18 Aug

1 day 15 hours

42 earthquakes

S20140821.1(2.4km)

20 Aug

1 day 4 hours

40 earthquakes

2015

S20150121.1(0.4km)

21 Jan

1 day 8 hours

135 earthquakes

S20151014.1(4.8km)

13 Oct

1 day 20 hours

31 earthquakes

S20151107.1(3.1km)

7 Nov

1 day 23 hours

85 earthquakes

2016

S20160925.1(3.3km)

24 Sep

1 day 16 hours

46 earthquakes

2017

S20170612.3(6.6km)

12 Jun

45 days 12 hours

1542 earthquakes

S20170802.1(5.4km)

1 Aug

17 days 7 hours

784 earthquakes

S20170821.1(6.8km)

20 Aug

4 days 18 hours

43 earthquakes

S20170827.1(6.5km)

27 Aug

3 days 8 hours

66 earthquakes

2018

S20180216.1(9.6km)

15 Feb

11 days 1 hours

728 earthquakes

S20180725.1(25.6km)

24 Jul

2 days 20 hours

52 earthquakes

2019

S20190326.2(23.6km)

26 Mar

20 hours

29 earthquakes

S20191026.1(24.2km)

26 Oct

1 day 22 hours

83 earthquakes

2020

S20200219.1(24.9km)

18 Feb

2 days 20 hours

62 earthquakes

S20200509.3(10.8km)

9 May

2 days 5 hours

80 earthquakes

S20200522.1(23.6km)

22 May

2 hours

36 earthquakes

S20200529.1(24.3km)

29 May

1 day 10 hours

88 earthquakes

2021

SVS20210621.1(29.9km)

21 Jun

1 day 13 hours

117 earthquakes

S20210628.1(4.1km)

27 Jun

5 days 17 hours

230 earthquakes

2022

S20220329.1(15.1km)

28 Mar

2 days 12 hours

117 earthquakes

S20220611.1(25.2km)

10 Jun

2 days 20 hours

62 earthquakes

S20220826.1(24.2km)

26 Aug

9 days 4 hours

198 earthquakes

S20220918.2(24.1km)

17 Sep

6 days 20 hours

389 earthquakes

S20220930.1(25.1km)

29 Sep

3 days 4 hours

53 earthquakes

S20221013.1(24.4km)

13 Oct

8 days 6 hours

111 earthquakes

S20221115.1(25.7km)

14 Nov

2 days 5 hours

48 earthquakes

2023

S20230207.2(14.7km)

6 Feb

2 days 9 hours

63 earthquakes

S20230313.1(1.2km)

13 Mar

1 day 18 hours

136 earthquakes

S20231004.1(24.7km)

3 Oct

1 day 14 hours

39 earthquakes

2024

S20240106.1(13.1km)

6 Jan

10 hours

35 earthquakes

S20240218.1(25.3km)

18 Feb

9 hours

50 earthquakes

S20240423.1(2.9km)

23 Apr

4 days 7 hours

79 earthquakes

2025

S20250507.1(3.1km)

7 May

8 hours

37 earthquakes

AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20250304.1 Near Hebgen Lake, Montana

A seismic swarm designated S20250304.1 was recorded 3 km east-southeast of Hebgen Lake Estates, Montana. The sequence began at 02:21 on 4 March 2025 and concluded at 14:34 the same day, encompassing 25 earthquakes over 12 hours and 13 minutes. Event magnitudes ranged from -1.1 to 0.5, with focal depths between 2 km and 9 km. The initial event registered magnitude 0.5 at 8 km depth, while later activity included several events near magnitude -1.0 at shallower depths around 2–3 km.

Hebgen Lake lies within the Intermountain Seismic Belt, a zone of active crustal extension that extends from northern Utah through western Montana. The area is influenced by both tectonic faulting along the Hebgen Lake fault and magmatic processes associated with the nearby Yellowstone volcanic system. Historical deformation and seismicity reflect ongoing adjustments along normal faults that accommodate regional extension.

Earthquake swarms are recurrent in this setting. Since 1 January 2000, 88 swarms have been documented in the region. Annual counts include eight swarms in 2000, seven each in 2013 and 2022, and six each in 2008 and 2014. Lower activity occurred in several years, with only one swarm recorded in 2005, 2010, 2011, and 2016. These episodes typically consist of numerous small-magnitude events clustered in time and space, consistent with fluid migration or stress triggering along pre-existing faults.

The March 2025 swarm fits this established pattern. Most events remained below magnitude 0.0, and the majority occurred at depths of 5–8 km. Shallower events near 2 km depth appeared intermittently, particularly in the later portion of the sequence. No single dominant mainshock was observed; instead, energy release was distributed across many low-magnitude earthquakes.

Such swarms contribute to the long-term seismic hazard assessment of the Hebgen Lake–Yellowstone region. Continued monitoring helps distinguish between purely tectonic sequences and those potentially linked to deeper hydrothermal or magmatic processes.

References

U.S. Geological Survey Earthquake Hazards Program reports on the Intermountain Seismic Belt and Hebgen Lake fault zone.
SeismoSight internal swarm classification database for event S20250304.1 parameters and historical swarm statistics since 2000.