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Note:This page contains AI-generated content for informational and entertainment purposes only. It may contain inaccuracies. Raw event data is from USGS and EMSC. All statistics, lists, and derived information are generated by this site. Full disclaimerFound an error?
Location:
43 km E of Fort Bidwell, California
Period:
4 Nov 2014 06:13:15 - 30 Dec 2014 05:05:23 (55 days 22 hours 52 minutes)
Volcanoes in 100km radius:
None
Earthquakes:
1792
19 swarms found nearby.
2014
31 Jul
2 days 23 hours
51 earthquakes
4 Aug
5 days 7 hours
82 earthquakes
18 Aug
2 days 20 hours
111 earthquakes
23 Aug
1 day 19 hours
27 earthquakes
28 Aug
2 days 2 hours
36 earthquakes
14 Sep
2 days 23 hours
44 earthquakes
1 Oct
1 day 19 hours
30 earthquakes
30 Oct
2 days 7 hours
40 earthquakes
30 Dec
38 days 0 hours
1571 earthquakes
2015
11 Feb
26 days 3 hours
529 earthquakes
15 Jul
4 days 9 hours
258 earthquakes
26 Jul
9 days 5 hours
152 earthquakes
10 Aug
10 days 1 hours
158 earthquakes
30 Aug
2 days 7 hours
43 earthquakes
13 Sep
32 days 6 hours
545 earthquakes
18 Nov
6 days 21 hours
137 earthquakes
24 Dec
18 days 2 hours
467 earthquakes
2022
S20221208.1(14.1km)
7 Dec
2 days 15 hours
44 earthquakes
2025
26 Jun
2 days 16 hours
38 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20141104.1: Analysis of Activity East of Fort Bidwell, California

Seismic swarm S20141104.1 was recorded beginning at 06:13 on 4 November 2014 and concluding at 05:05 on 30 December 2014. The sequence was centered 43 km east of Fort Bidwell, California, and comprised 1792 earthquakes over a span of 1342 hours and 52 minutes.

Examination of the first 100 events reveals predominantly shallow foci, with the majority at depths of 0–5 km. Magnitudes ranged from 0.9 to 4.6, featuring an initial cluster of events below magnitude 2.0 followed by progressive escalation. Notable shocks include a magnitude 4.0 at 10:47 on 4 November, a magnitude 3.3 at 21:16 on the same day, and the sequence peak of magnitude 4.6 at 07:23 on 5 November. Subsequent activity through 5 November maintained elevated rates with frequent magnitude 2.0–3.0 events, interspersed with brief lulls. Depths remained shallow overall, indicating a near-surface source consistent with swarm behavior driven by fluid migration or localized stress adjustments rather than a single mainshock-aftershock pattern.

The Fort Bidwell region occupies the northwestern margin of the Basin and Range province within the Modoc Plateau. This area is underlain by Miocene to Pleistocene volcanic and volcaniclastic rocks, primarily basaltic and andesitic flows, with structural control exerted by north-northwest-trending normal faults. Extension across the province produces recurrent seismic swarms, often linked to geothermal fluid circulation along fault zones. Historical records since 2000 document eight such swarms in the broader area, with S20141104.1 representing the earliest in the catalog.

Regional tectonics reflect ongoing transtensional deformation between the Pacific and North American plates, modulated by the influence of the Cascade volcanic arc to the west. Seismicity is typically diffuse and shallow, rarely exceeding magnitude 5.0 in swarms, aligning with the observed characteristics of this sequence.

References

USGS Earthquake Catalog
California Geological Survey regional reports
Nevada Seismological Laboratory archives