Zusammenfassung
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.
Nutzer