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

Feng, W., Li, Z., and Li, C. (2010) Optimal source parameters of the 6 April 2009 Mw 6.3 L’Aquila, Italy earthquake from InSAR observations. Di qiu wu li xue jin zhan = Progress in Geophysics, 25 (5). pp. 1550-1559. ISSN 1004-2903 (doi:10.3969/j.issn.1004-2903.2010.05.004 )

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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.

Item Type:Article
Keywords:InSAR; L'Aquila Earthquake; Quadtree Algorithm; R-based resampling; source parameters; geodetic inversion
Status:Published
Refereed:Yes
Glasgow Author(s):Li, Dr Zhenhong
Authors: Feng, W., Li, Z., and Li, C.
Subjects:Q Science > QE Geology
G Geography. Anthropology. Recreation > GB Physical geography
T Technology > TA Engineering (General). Civil engineering (General)
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:Di qiu wu li xue jin zhan = Progress in Geophysics
Journal Abbr.:Progress in Geophysics
ISSN:1004-2903
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
513031GAS: Generic Atmosphere Solutions for radar measurementsZhenhong LiNatural Environment Research Council (NERC)NE/H001085/1School of Geographical and Earth Sciences