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Optimal source parameters of the 6 April 2009 Mw 6.3 L’Aquila, Italy earthquake from InSAR observations

Lookup NU author(s): Professor Zhenhong Li

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Abstract

On 6th April 2009 a Mw6.3 earthquake occurred in the L' Aquila region, central Italy, causing at least 297 fatalities and great economic losses. Using European Space Agency's ENVISAT ASAR data we generated three independent coseismic interferograms. Three popular downsampling techniques (uniform, quadtree and Resolution-based) were employed to create 4 different sets of datapoints, two of which were produced using the uniform approach with different sampling sizes. Uniform models with the 4 sets of datapoints show similar source parameters and residuals, indicating their impacts on uniform modeling are limited. However, their distributed slip models suggest that the resolution-based approach is preferred though similar slip patterns can be observed. Our optimal distributed slip model shows that this event is associated with a buried SW-dipping normal fault with the epicenter at (13.4506°,42.3580°),a strike of 141.3°, and a dip of 50°. In addition, the maximum slip of 1.2 m is observed at a depth of 6.1 km, and the total seismic monent is ~3.65×10^18N·m.

Publication metadata

Author(s): Feng W, Li Z, Li C

Publication type: Article

Publication status: Published

Journal: Diqiu Wulixue Jinzhan = Progress in Geophysics

Year: 2010

Volume: 25

Issue: 5

Pages: 1550-1559

ISSN (print): 1004-2903

Publisher: Zhongguo Kexueyuan Dizhi yu Diqiu Wuli Yanjiusuo

URL: http://118.145.16.227/geoprog/EN/abstract/abstract3358.shtml

DOI: 10.3969/j.issn.1004-2903.2010.05.004

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