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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:
CENTRAL ITALY
Period:
3 Nov 2010 02:18:22 - 9 Nov 2010 02:41:27 (6 days 23 minutes)
Volcanoes in 100km radius:
Colli Albani(94km)
Earthquakes:
176
14 swarms found nearby.
2009
S20090330.1(26.6km)
30 Mar
98 days 16 hours
6163 earthquakes
S20090510.1(11.7km)
9 May
13 days 16 hours
178 earthquakes
25 Jun
3 days 7 hours
118 earthquakes
12 Jul
6 days 5 hours
128 earthquakes
S20090801.1(19.8km)
31 Jul
19 days 15 hours
224 earthquakes
22 Aug
6 days 9 hours
83 earthquakes
2010
30 Aug
25 days 22 hours
427 earthquakes
30 Sep
11 days 3 hours
111 earthquakes
19 Oct
6 days 18 hours
375 earthquakes
2011
S20110215.1(21.1km)
15 Feb
1 day 8 hours
27 earthquakes
5 Mar
8 days 1 hours
87 earthquakes
18 Oct
1 day 4 hours
25 earthquakes
2016
S20161030.1(19.4km)
30 Oct
3 days 20 hours
72 earthquakes
2017
18 Jan
5 days 9 hours
231 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20101104.1: Analysis of Central Italy Activity in November 2010

Central Italy remains one of Europe's most seismically active zones, shaped by ongoing extensional tectonics along the Apennine mountain chain. The region experiences frequent earthquake swarms due to normal faulting driven by the interaction between the African and Eurasian plates. Shallow crustal events, typically occurring between 5 and 15 km depth, characterize this activity. Historical records document repeated swarm episodes linked to fluid migration and stress redistribution along fault networks.

Swarm S20101104.1 began at 02:18 on 3 November 2010 and concluded at 02:41 on 9 November 2010. Over 144 hours and 23 minutes, the sequence produced 176 earthquakes concentrated in central Italy. Magnitudes remained modest, with the strongest reaching 2.6, while depths clustered between 5 and 14 km. These parameters align with the typical signature of Apennine swarms, where low-magnitude events dominate without a clear mainshock-aftershock pattern.

Analysis of the first 100 recorded events reveals consistent characteristics. Initial activity on 3 November featured magnitudes from 1.1 to 2.4 at depths of 5 to 13 km. Subsequent events through 4 November maintained similar ranges, with peaks at 2.6 and depths predominantly around 10 to 12 km. The sequence showed no escalation beyond moderate levels, reflecting a diffuse release of strain rather than concentrated rupture. Depths stayed shallow throughout, consistent with the brittle upper crust of the region.

Since 1 January 2000, nine swarms have occurred in central Italy according to SeismoSight internal classification. Earlier episodes numbered six in 2009 and three in 2010, underscoring elevated swarm frequency during that period. Such clustering often precedes or accompanies larger tectonic adjustments in the Apennines.

Geological context places these events within the Umbria-Marche and Abruzzo sectors, where Quaternary normal faults accommodate extension at rates of several millimeters per year. The 2010 swarm fits established patterns of background seismicity punctuated by episodic swarms, as documented in long-term instrumental catalogs.

References

  • SeismoSight internal swarm classification records
  • Istituto Nazionale di Geofisica e Vulcanologia (INGV) seismic bulletins and Apennine tectonics reports