TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 64 (No. 12), pp. 1245-1246, 2012

Constraint on the recurrence of great outer-rise earthquakes from seafloor bathymetry

Norman H. Sleep

Department of Geophysics, Stanford University, Stanford, California, USA

(Received January 19, 2012; Revised July 26, 2012; Accepted July 31, 2012; Online published January 28, 2013)

Abstract: Great outer rise earthquakes are a tsunami hazard as they occur on steeply dipping faults (Lay et al, 2009). The largest instrumentally recorded of these events are the 1933 Sanriku Japan earthquake (Mw = 8.4) and 1977 Sumba Indonesia earthquake (Mw = 8.3) (Lay et al., 2009). Seafloor bathymetry (Kobayashi et al, 1998) and plate kinematics indicate a great Mw ≥ 8 outer rise earthquake on the zone of the great Tohoku Mw 9 event can occur at most once in 7 megathrust cycles.
Key words: Triggered earthquakes, normal faults, subduction, earthquake risk.

Corresponding author E-mail: norm@stanford.edu

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