The 2011 Magnitude 9.0 Tohoku-Oki Earthquake: Mosaicking the Megathrust from Seconds to Centuries
Mark Simons,Sarah E. Minson,Anthony Sladen,Anthony Sladen,F. Ortega,Junle Jiang,Susan Owen,Lingsen Meng,Jean-Paul Ampuero,Shengji Wei,Risheng Chu,Donald V. Helmberger,Hiroo Kanamori,Eric A. Hetland,Angelyn Moore,Frank Webb +15 more
TLDR
Detailed geophysical measurements reveal features of the 2011 Tohoku-Oki megathrust earthquake and suggest the need to consider the potential for a future large earthquake just south of this event.Abstract:
Geophysical observations from the 2011 moment magnitude (M_w) 9.0 Tohoku-Oki, Japan earthquake allow exploration of a rare large event along a subduction megathrust. Models for this event indicate that the distribution of coseismic fault slip exceeded 50 meters in places.
Sources of high-frequency seismic waves delineate the edges of the
deepest portions of coseismic slip and do not simply correlate with the
locations of peak slip. Relative to the M_w 8.8 2010 Maule, Chile
earthquake, the Tohoku-Oki earthquake was deficient in high-frequency
seismic radiation-a difference that we attribute to its relatively
shallow depth. Estimates of total fault slip and surface secular strain
accumulation on millennial time scales suggest the need to consider the
potential for a future large earthquake just south of this event.read more
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