Shallow dynamic overshoot and energetic deep rupture in the 2011 Mw 9.0 Tohoku-Oki earthquake.

Science 2011 Jun 19;332(6036):1426-9. Epub 2011 May 19.

Department of Earth and Planetary Science, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan.

Strong spatial variation of rupture characteristics in the moment magnitude (M(w)) 9.0 Tohoku-Oki megathrust earthquake controlled both the strength of shaking and the size of the tsunami that followed. Finite-source imaging reveals that the rupture consisted of a small initial phase, deep rupture for up to 40 seconds, extensive shallow rupture at 60 to 70 seconds, and continuing deep rupture lasting more than 100 seconds. A combination of a shallow dipping fault and a compliant hanging wall may have enabled large shallow slip near the trench. Normal faulting aftershocks in the area of high slip suggest dynamic overshoot on the fault. Despite prodigious total slip, shallower parts of the rupture weakly radiated at high frequencies, whereas deeper parts of the rupture radiated strongly at high frequencies.

Download full-text PDF

Source
http://dx.doi.org/10.1126/science.1207020DOI Listing
June 2011
5 Reads

Publication Analysis

Top Keywords

deep rupture
12
radiated high
8
rupture seconds
8
high frequencies
8
rupture
8
parts rupture
8
dynamic overshoot
8
shallow
4
shallow rupture
4
extensive shallow
4
normal faulting
4
seconds continuing
4
overshoot fault
4
rupture lasting
4
continuing deep
4
seconds extensive
4
fault despite
4
prodigious total
4
rupture consisted
4
despite prodigious
4

References

(Supplied by CrossRef)

Wells et al.
Bulletin of the Seismological Society of America 1994

Mai et al.
Bulletin of the Seismological Society of America 2000

Geophysical Research Letters 1978

FUKUYAMA et al.
Bulletin of the Seismological Society of America 1986

MORI et al.
Bulletin of the Seismological Society of America 1990

Tectonophysics 2001

J GEOPHYS RES 2010

MENDOZA et al.
Bulletin of the Seismological Society of America 1988

Science 1998

Oglesby et al.
Bulletin of the Seismological Society of America 2001

Ma et al.
Bulletin of the Seismological Society of America 2008

Similar Publications