Publication Date:
2021-06-07
Description:
In the period 2011 June–October, a tectonic swarm of nearly 1222 earthquakes occurred in
the Messenia prefecture at the southwestern region of the Peloponnese Peninsula. The swarm
happened in the Messenia’s Upper Quaternary basin, 25 km NW of the city of Kalamata,
and migrated from NNW towards SSE. The largest earthquakes occurred in 2011 August
14 (Mw = 4.8), September 14 (Mw = 4.6) and October 10 (Mw = 4.7), caused moderate
structural damages mainly in old houses in four villages and produced particular unrest to the
local population. We have investigated the monthly migration of the swarm using Differential
Synthetic Aperture Radar Interferometry (DInSAR), presenting for the first time a very close
look at the deformation evolution that may reveal an aseismic slip component of the total
movement. The geodetically derived slip distribution for the first 4 months revealed that slip
migrated laterally along strike (north to south) and vertically from a deep portion, at ∼2.8 km
depth, to a shallow portion, at less than 0.5 km, of the fault plane, and concluded its migration
towards the surface with a very shallow Mw 4.7 event of 2011 October 10 surprisingly detected
by DInSAR.
Description:
Published
Description:
1302–1309
Description:
2T. Tettonica attiva
Description:
JCR Journal
Description:
restricted
Keywords:
SAR interferometry
;
seismic swarm
;
04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
;
04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
;
04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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