Abstract
The 27 February 2010 Chile (Mw 8.8) earthquake is the fifth largest
earthquake to strike during the age of seismological instrumentation.
The faulting geometry, slip distribution, seismic moment, and moment-rate
function are estimated from broadband teleseismic P, SH, and Rayleigh
wave signals. We explore some of the trade-offs in the rupture-process
estimation due to model parameterizations, limited teleseismic sampling
of seismic phase velocities, and uncertainty in fault geometry. The
average slip over the \~81,500 km2 rupture area is about 5 m, with
slip concentrations down-dip, up-dip and southwest, and up-dip and
north of the hypocenter. Relatively little slip occurred up-dip/offshore
of the hypocenter. The average rupture velocity is \~2.0-2.5 km/s.
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