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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:
WESTERN TURKEY
Period:
20 Nov 2025 23:54:08 - 25 Nov 2025 09:44:38 (4 days 9 hours 50 minutes)
Volcanoes in 100km radius:
Kula(85km)
Earthquakes:
76
21 swarms found nearby.
2009
S20090217.1(14.4km)
17 Feb
4 days 19 hours
161 earthquakes
2011
S20110329.1(13.8km)
28 Mar
1 day 8 hours
37 earthquakes
S20110519.1(14.8km)
19 May
42 days 15 hours
2795 earthquakes
S20110706.1(16.1km)
5 Jul
4 days 9 hours
63 earthquakes
S20110717.2(14.4km)
17 Jul
7 days 23 hours
114 earthquakes
2012
S20120416.1(21.1km)
16 Apr
16 days 9 hours
393 earthquakes
S20120503.1(18.7km)
3 May
6 days 16 hours
182 earthquakes
S20120619.1(19.7km)
18 Jun
2 days 1 hours
34 earthquakes
2025
19 Apr
4 days 5 hours
107 earthquakes
24 Apr
17 days 3 hours
818 earthquakes
18 May
2 days 18 hours
53 earthquakes
29 May
6 days 15 hours
82 earthquakes
7 Jun
19 days 3 hours
405 earthquakes
28 Jul
1 day 19 hours
36 earthquakes
31 Jul
1 day 16 hours
30 earthquakes
20 Sep
3 days 6 hours
47 earthquakes
28 Sep
30 days 0 hours
1357 earthquakes
8 Dec
4 days 20 hours
61 earthquakes
2026
10 Feb
1 day 21 hours
33 earthquakes
16 Feb
3 days 10 hours
56 earthquakes
10 Apr
4 days 9 hours
220 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20251121.1 in Western Turkey: Geological Context and Event Analysis

Western Turkey occupies a tectonically complex zone shaped by the interaction of the Eurasian, African, and Arabian plates. The region experiences active extension within the Aegean domain, driven by rollback of the Hellenic slab and westward extrusion of Anatolia along the North Anatolian Fault. These processes produce frequent normal and strike-slip faulting, resulting in elevated seismicity across the Menderes Massif and surrounding grabens.

Seismic swarms represent clusters of earthquakes without a single dominant mainshock, often linked to fluid migration or aseismic slip along faults. Swarm S20251121.1 occurred in this setting, registering 76 events over 105 hours and 50 minutes from 23:54 on 20 November 2025 to 09:44 on 25 November 2025.

Magnitudes remained predominantly low, with the largest event reaching 3.7 at a depth of 5 km on 21 November. Depths ranged from 4 km to 28 km, concentrating between 5 km and 15 km and indicating shallow crustal activity typical of the extensional regime. A notable sequence of events above magnitude 2.0 clustered on 21 November between 18:22 and 21:34, followed by additional activity through 24 November.

Historical records maintained by SeismoSight document 17 swarms in the same area since 1 January 2000. These occurred in 2009 (1 swarm), 2011 (4 swarms), 2012 (3 swarms), and 2025 (9 swarms). The elevated count in 2025 aligns with ongoing monitoring of microseismic sequences in the western Anatolian extensional province.

Such swarms contribute to long-term strain release without producing destructive shaking, consistent with the region's background seismicity patterns. Continued observation supports improved understanding of fault behavior in this rapidly deforming zone.

References

  • SeismoSight internal swarm classification database (S20251121.1 parameters and historical statistics).
  • United States Geological Survey Earthquake Hazards Program: tectonic summaries for Turkey.
  • Journal of Geophysical Research: Solid Earth, reviews on Aegean extensional tectonics (updated through 2024).