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Authors: Piatanesi, A.*
Cirella, A.*
Spudich, P.*
Cocco, M.*
Title: A global search inversion for earthquake kinematic rupture history: Application to the 2000 western Tottori, Japan earthquake
Title of journal: Journal of Geophysical Research
Series/Report no.: /112(2007)
Publisher: AGU
Issue Date: 18-Jul-2007
DOI: 10.1029/2006JB004821
Keywords: earthquake
finite fault
source mechanics
Abstract: We present a two-stage nonlinear technique to invert strong motions records and geodetic data to retrieve the rupture history of an earthquake on a finite fault. To account for the actual rupture complexity, the fault parameters are spatially variable peak slip velocity, slip direction, rupture time and risetime. The unknown parameters are given at the nodes of the subfaults, whereas the parameters within a subfault are allowed to vary through a bilinear interpolation of the nodal values. The forward modeling is performed with a discrete wave number technique, whose Green’s functions include the complete response of the vertically varying Earth structure. During the first stage, an algorithm based on the heat-bath simulated annealing generates an ensemble of models that efficiently sample the good data-fitting regions of parameter space. In the second stage (appraisal), the algorithm performs a statistical analysis of the model ensemble and computes a weighted mean model and its standard deviation. This technique, rather than simply looking at the best model, extracts the most stable features of the earthquake rupture that are consistent with the data and gives an estimate of the variability of each model parameter. We present some synthetic tests to show the effectiveness of the method and its robustness to uncertainty of the adopted crustal model. Finally, we apply this inverse technique to the well recorded 2000 western Tottori, Japan, earthquake (Mw 6.6); we confirm that the rupture process is characterized by large slip (3-4 m) at very shallow depths but, differently from previous studies, we imaged a new slip patch (2-2.5 m) located deeper, between 14 and 18 km depth.
Appears in Collections:04.06.03. Earthquake source and dynamics
Papers Published / Papers in press

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2006JB004821RR-text_figures.pdfunformatted final version2.09 MBAdobe PDFView/Open
2007_JGR_rpi_inversion.pdfmain article3.8 MBAdobe PDFView/Open

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