Earth Planets and Space · 2014 · 17 citations · 15 references
Natural SciencesEarth SciencesGeophysicsGeodesySeismologyTectonicsCoseismic DeformationEarthquake Focal MechanismsFault MechanicsFault Zone SeismologyFault Zone StructureGeophysical InversionCoseismic Slip DistributionEarthquake Slip DirectionFault Slip DistributionGeodetic InversionGeodetic Slip InversionSeismic InversionSeismic Slip DistributionSeismic Waveform Analysis
On July 26, 2003, a disastrous earthquake with M6.4 struck the northern part of Miyagi prefecture, northern Honshu, Japan. GPS measurements and leveling surveys conducted by the Geographical Survey Institute (GSI) revealed clear evidence of coseismic deformation. We analyzed those data using a geodetic inversion to estimate the slip distribution on a curved fault plane, which is suggested by precise hypocenter determination performed by Tohoku University. The maximum slip area is located at the northern and shallower part of the fault plane, which is consistent with the slip distribution obtained by seismic waveform inversion. The spatial pattern of slip direction also shows good agreement with that of the focal mechanism.
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