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Rapid rupture and complex faulting of the May 12, 1990, Sakhalin deep earthquake : analysis of regional and teleseismic broadband data

A large (M w =7.1) deep earthquake (606 km) occurred beneath Sakhalin Island, about 200 km away from the nearest well-defined Wadati-Benioff zone in southwestern Kurile. Moment tensors obtained in various frequency bands using the teleseismic data show that the Sakhalin event produced double-couple radiation over a very broadband frequency range, and the P waveforms appear simple at most teleseismic stations (Δ=30-90 o ). On the other hand, many broadband seismometers successfully recorded the seismic waves at regional distances (Δ=3-25 o ) in Japan, showing two significant arrivals in the P wave seismograms whose time interval is about 3 s