DashboardNewsSwarmsM 7.0+
VolcanoesSupervolcanoesRegionsGlobal
Favorites
BlogAbout
Privacy PolicyDisclaimer
Follow
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 Sep 2025 19:29:33 - 24 Sep 2025 01:32:10 (3 days 6 hours 2 minutes)
Volcanoes in 100km radius:
Kula(83km)
Earthquakes:
47
21 swarms found nearby.
2009
S20090217.1(13.1km)
17 Feb
4 days 19 hours
161 earthquakes
2011
S20110329.1(12.5km)
28 Mar
1 day 8 hours
37 earthquakes
S20110519.1(13.1km)
19 May
42 days 15 hours
2795 earthquakes
S20110706.1(14.6km)
5 Jul
4 days 9 hours
63 earthquakes
S20110717.2(12.7km)
17 Jul
7 days 23 hours
114 earthquakes
2012
S20120416.1(20.0km)
16 Apr
16 days 9 hours
393 earthquakes
S20120503.1(17.5km)
3 May
6 days 16 hours
182 earthquakes
S20120619.1(18.6km)
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
28 Sep
30 days 0 hours
1357 earthquakes
20 Nov
4 days 9 hours
76 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 Activity in Western Turkey: Swarm S20250921.1

Western Turkey occupies a tectonically complex zone where the Anatolian Plate interacts with the Eurasian and African plates. The region experiences extensional tectonics driven by slab rollback along the Hellenic subduction zone and westward extrusion of the Anatolian Plate along the North Anatolian Fault. This setting produces frequent moderate seismicity, with crustal faults accommodating both strike-slip and normal motion at depths typically between 5 and 15 km.

SeismoSight recorded Swarm S20250921.1 beginning at 19:29 on 20 September 2025 and concluding at 01:32 on 24 September 2025. Over 78 hours and 2 minutes, 47 earthquakes were detected. Magnitudes ranged from 1.0 to 4.1, with the largest event occurring at 23:16 on 20 September at a depth of 10 km. Most events clustered between 7 and 11 km depth, consistent with shallow crustal faulting in the area.

The sequence displayed classic swarm characteristics: a gradual increase in activity without a single dominant mainshock, followed by a steady decline over several days. Early events on 20 September included multiple shocks above magnitude 2.0, after which activity remained largely below magnitude 2.0 except for isolated events reaching 2.6 and 2.3 on 21 and 23 September. Depths stayed shallow throughout, rarely exceeding 15 km.

Historical records maintained by SeismoSight show that 15 swarms have occurred in the same region since 1 January 2000. Earlier episodes were documented in 2009 (one swarm), 2011 (four swarms), 2012 (three swarms), and 2025 (seven swarms). These recurrent swarms reflect ongoing strain accumulation and release along segmented fault systems that characterize western Anatolia.

Such swarms are commonly linked to fluid migration or aseismic slip that perturbs nearby fault patches, producing diffuse microseismicity rather than a classic foreshock-mainshock-aftershock pattern. In western Turkey, similar sequences have preceded larger events on occasion, underscoring the importance of continuous monitoring.

  • SeismoSight internal swarm catalog (S20250921.1 parameters)
  • USGS Earthquake Hazards Program regional tectonics overview
  • Turkish Disaster and Emergency Management Authority (AFAD) historical seismicity summaries