Seismic remote sensing for the earthquake source process and near-source strong shaking: A case study of the October 16, 1999 hector mine earthquake

A new methodology to automatically determine the earthquake source process and near-source strong ground motions using regional and local distance dat a was used. to study the October 16, 1999 Hector Mine earthquake (M(w)7.1). Broadband displacement data were inverted for the seismic moment tensor an d to resolve the fault plane ambiguity independent of aftershock location a nd surface faulting information. The identified NNW striking fault plane wa s used to invert for the distribution of fault slip over a planar surface. The slip model was used to predict near-fault peak ground velocity, which w as found to agree well with the TriNet ShakeMap, and also with near-fault o bservations that were not available at the time of the initial analysis. Ou r method if automated is capable of providing near-source strong ground mot ion information within 30 minutes of the earthquake origin time even in cas es where there are few near-fault recording instruments.