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Authors: Romano, F.*
Piatanesi, A.*
Lorito, S.*
D'Agostino, N.*
Hirata, K.*
Atzori, S.*
Yamazaki, Y.*
Cocco, M.*
Title: Clues from joint inversion of tsunami and geodetic data of the 2011 Tohoku-oki earthquake
Title of journal: Scientific Reports
Series/Report no.: /2 (2012)
Publisher: Nature Publishing Group
Issue Date: 27-Apr-2012
DOI: 10.1038/srep00385
Keywords: Tohoku
Inverse problem
Abstract: The 2011 Tohoku-oki (Mw 9.1) earthquake is so far the best-observed megathrust rupture, which allowed the collection of unprecedented offshore data. The joint inversion of tsunami waveforms (DART buoys, bottom pressure sensors, coastal wave gauges, and GPS-buoys) and static geodetic data (onshore GPS, seafloor displacements obtained by a GPS/acoustic combination technique), allows us to retrieve the slip distribution on a non-planar fault. We show that the inclusion of near-source data is necessary to image the details of slip pattern (maximum slip ,48 m, up to ,35 m close to the Japan trench), which generated the large and shallow seafloor coseismic deformations and the devastating inundation of the Japanese coast. We investigate the relation between the spatial distribution of previously inferred interseismic coupling and coseismic slip and we highlight the importance of seafloor geodetic measurements to constrain the interseismic coupling, which is one of the key-elements for long-term earthquake and tsunami hazard assessment.
Appears in Collections:04.07.06. Subduction related processes
04.06.03. Earthquake source and dynamics
Papers Published / Papers in press

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