Clues from joint inversion of tsunami and geodetic data of the 2011 Tohoku-oki earthquake
Romano, F.; Piatanesi, A.; Lorito, S.; D'Agostino, N.; Hirata, K.; Atzori, S.; Yamazaki, Y.; Cocco, M. (2012). Clues from joint inversion of tsunami and geodetic data of the 2011 Tohoku-oki earthquake. NPG Scientific Reports 2(385): 8 pp. http://dx.doi.org/10.1038/srep00385
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322; e-ISSN 2045-2322, more
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| Keywords |
Earth sciences > Geophysics > Geodesy
Hazards > Geological hazards > Earthquakes
Water waves > Surface water waves > Tsunamis
INW, Japan [Marine Regions]
Marine/Coastal |
| Authors | | Top |
- Romano, F.
- Piatanesi, A.
- Lorito, S.
- D'Agostino, N.
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- Hirata, K.
- Atzori, S.
- Yamazaki, Y.
- Cocco, M.
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| 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. |
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