Coseismic velocity variations caused by static stress changes associated with the 2001 Mw=4.3 Agios Ionis earthquake in the Gulf of Corinth, Greece

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Title: Coseismic velocity variations caused by static stress changes associated with the 2001 Mw=4.3 Agios Ionis earthquake in the Gulf of Corinth, Greece
Authors: Cociani, L.
Bean, Christopher J.
Lyon-Caen, Helene
et al.
Permanent link: http://hdl.handle.net/10197/5443
Date: Jul-2010
Abstract: The analysis of temporal variations in the seismic velocity across faults can be used to estimate in situ stress changes. Seismic velocity of propagation depends on the fault stiffness, which is a function of stress. The coda wave interferometry technique is applied to seven families of repeating earthquakes (multiplets) recorded on the southern shore of the Gulf of Corinth, Greece, to estimate high precision velocity changes in the Earth ’ s crust associated with the M w = 4.3 Agios Ioanis earthquake. Results show that the Agios Ioanis event causes a perturbation in elastic properties at seismogenic depth, resulting in a reduction of 0.2% in the seismic velocity. The results are not consistent with either damage induced by dynamic stresses nor a fluid transient origin. In contrast, both the spatial distribution and magnitude of the velocity perturbation correlate well with modeled static stress variations. This suggests that the measured changes in the mechanical properties of the seismogenic crust can be attributed to a change in static stress field associated with the M w = 4.3 Agios Ioanis earthquake. The velocity changes indicate an unclamping of the Pyrgaki fault at depth, which has local hazard implications
Type of material: Journal Article
Publisher: American Geophysical Union
Copyright (published version): 2010, American Geophysical Union
Keywords: Earthquake dynamics;Fractures and faults;Seismic monitoring and test-ban treaty verification;Seismicity and tectonics
DOI: 10.1029/JB006859
Language: en
Status of Item: Peer reviewed
Appears in Collections:Earth Sciences Research Collection

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