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Location:
0 km ENE of Hebgen Lake Estates, Montana
Period:
16 Jul 2004 21:36:34 - 18 Jul 2004 13:36:36 (1 day 16 hours)
Volcanoes in 100km radius:
None
Earthquakes:
38
66 swarms found nearby.
2000
S20000125.1(15.8km)
25 Jan
1 day 8 hours
67 earthquakes
S20000329.2(13.8km)
29 Mar
9 days 3 hours
185 earthquakes
S20000409.1(13.7km)
8 Apr
1 day 23 hours
41 earthquakes
25 Oct
2 days 15 hours
52 earthquakes
S20001224.1(27.2km)
23 Dec
4 days 11 hours
64 earthquakes
2001
S20010119.1(17.2km)
18 Jan
4 days 18 hours
341 earthquakes
S20010227.1(15.1km)
26 Feb
2 days 5 hours
56 earthquakes
S20011202.1(11.1km)
2 Dec
5 days 0 hours
131 earthquakes
8 Dec
19 days 5 hours
335 earthquakes
2002
S20020130.2(17.8km)
30 Jan
2 days 22 hours
52 earthquakes
S20021104.1(19.7km)
3 Nov
4 days 4 hours
118 earthquakes
S20021104.5(11.1km)
3 Nov
3 days 12 hours
80 earthquakes
S20021205.1(18.1km)
5 Dec
2 days 12 hours
405 earthquakes
S20021214.1(15.1km)
13 Dec
1 day 12 hours
26 earthquakes
2003
S20030103.2(29.0km)
3 Jan
4 days 3 hours
75 earthquakes
S20030131.1(30.0km)
31 Jan
1 day 15 hours
36 earthquakes
S20030206.1(12.1km)
5 Feb
1 day 18 hours
42 earthquakes
2004
S20040413.1(19.2km)
13 Apr
6 days 22 hours
457 earthquakes
2005
3 Jun
2 days 8 hours
49 earthquakes
2006
S20060613.1(29.5km)
12 Jun
1 day 14 hours
45 earthquakes
S20060618.1(12.1km)
18 Jun
1 day 11 hours
57 earthquakes
2007
S20070620.1(29.7km)
20 Jun
1 hours
26 earthquakes
14 Dec
22 hours
28 earthquakes
S20071231.1(19.7km)
30 Dec
3 days 10 hours
61 earthquakes
2008
S20080109.1(18.9km)
9 Jan
4 days 20 hours
89 earthquakes
S20080203.1(29.8km)
3 Feb
21 hours
47 earthquakes
S20080729.1(30.0km)
28 Jul
4 days 18 hours
189 earthquakes
S20080807.1(26.4km)
7 Aug
6 hours
32 earthquakes
3 Dec
6 days 17 hours
213 earthquakes
2009
16 Apr
5 days 18 hours
136 earthquakes
12 Sep
21 hours
24 earthquakes
16 Sep
1 day 7 hours
28 earthquakes
2010
S20100117.1(27.9km)
16 Jan
19 days 8 hours
2268 earthquakes
2011
3 May
1 day 22 hours
33 earthquakes
2013
S20130507.1(27.0km)
7 May
22 hours
34 earthquakes
29 Jun
3 days 16 hours
79 earthquakes
S20130713.1(20.6km)
13 Jul
19 hours
30 earthquakes
27 Sep
1 day 12 hours
28 earthquakes
S20131123.1(10.6km)
23 Nov
6 days 16 hours
223 earthquakes
2014
S20140122.1(28.9km)
21 Jan
2 days 1 hours
46 earthquakes
18 Aug
1 day 15 hours
42 earthquakes
20 Aug
1 day 4 hours
40 earthquakes
2015
21 Jan
1 day 8 hours
135 earthquakes
13 Oct
1 day 20 hours
31 earthquakes
7 Nov
1 day 23 hours
85 earthquakes
2016
24 Sep
1 day 16 hours
46 earthquakes
2017
S20170612.3(10.3km)
12 Jun
45 days 12 hours
1542 earthquakes
1 Aug
17 days 7 hours
784 earthquakes
20 Aug
4 days 18 hours
43 earthquakes
S20170827.1(12.0km)
27 Aug
3 days 8 hours
66 earthquakes
2018
S20180216.1(16.0km)
15 Feb
11 days 1 hours
728 earthquakes
2019
S20190326.2(29.9km)
26 Mar
20 hours
29 earthquakes
2020
S20200509.3(14.8km)
9 May
2 days 5 hours
80 earthquakes
S20200522.1(29.9km)
22 May
2 hours
36 earthquakes
2021
27 Jun
5 days 17 hours
230 earthquakes
2022
S20220329.1(21.1km)
28 Mar
2 days 12 hours
117 earthquakes
S20220826.1(29.6km)
26 Aug
9 days 4 hours
198 earthquakes
S20220918.2(29.5km)
17 Sep
6 days 20 hours
389 earthquakes
S20221013.1(29.8km)
13 Oct
8 days 6 hours
111 earthquakes
2023
S20230207.2(19.4km)
6 Feb
2 days 9 hours
63 earthquakes
13 Mar
1 day 18 hours
136 earthquakes
2024
S20240106.1(19.5km)
6 Jan
10 hours
35 earthquakes
23 Apr
4 days 7 hours
79 earthquakes
2025
4 Mar
12 hours
25 earthquakes
7 May
8 hours
37 earthquakes
S20250830.1(29.0km)
29 Aug
3 days 9 hours
38 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20040717.1 Near Hebgen Lake Estates, Montana

A seismic swarm designated S20040717.1 occurred 0 km ENE of Hebgen Lake Estates, Montana, registering 38 earthquakes over approximately 40 hours. The sequence began at 21:36 on 16 July 2004 and concluded at 13:36 on 18 July 2004. Magnitudes ranged from -0.8 to 2.2, with the majority of events below magnitude 1.0. Depths clustered primarily between 8 and 13 km, though isolated events extended from 2 km to 17 km, consistent with shallow crustal seismicity in the region.

The swarm exhibited typical characteristics of clustered microseismicity, featuring several low-magnitude events in rapid succession during peak activity on 16 and 17 July. Notable events included a magnitude 2.2 earthquake at 20:49 on 17 July at 11 km depth and multiple magnitude 1.6 events at similar depths. Activity tapered significantly by the morning of 18 July, with the final recorded event at magnitude 0.3.

Hebgen Lake lies within the Intermountain Seismic Belt, a zone of active extensional tectonics influenced by the Yellowstone hotspot. The local geology features Quaternary fault scarps and basin-and-range structures, with the Hebgen Lake fault system accommodating regional strain. Historical large-magnitude events, such as the 1959 Hebgen Lake earthquake of magnitude 7.3, underscore the area's capacity for significant seismic release, though swarms like this one represent lower-energy, non-destructive sequences.

Since 1 January 2000, 18 swarms have been documented in the vicinity. Yearly distribution includes five swarms in 2000, four in 2001, five in 2002, three in 2003, and one in 2004 up to the time of this event. These recurrent swarms reflect ongoing tectonic adjustment and fluid migration within the crust, common in hotspot-adjacent settings.

This swarm provides additional data on the frequency and style of background seismicity that characterizes the Hebgen Lake area, contributing to improved understanding of strain accumulation along nearby faults.

References

SeismoSight internal swarm classification records.
U.S. Geological Survey earthquake catalog for Hebgen Lake region.
Montana Bureau of Mines and Geology regional tectonic summaries.