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- W2004482588 abstract "Long‐ and short‐period body waveform data recorded at regional and teleseismic distances are modeled to obtain the source parameters of the Whittier Narrows earthquake of October 1, 1987. Although the long‐period data can be satisfied by a simple thrust earthquake on a plane striking 280° at a depth of 14 km, we require a double source solution to satisfy both the long‐ and short‐period teleseismic data. The first subevent has a focal mechanism of strike ( θ ) = 250°, dip (δ) = 30°N, and a slip vector (λ) = 90°; the second is θ = 280°, δ = 40°N, and λ = 98°. The second event occurred 1.0 s after the first, was 5 times larger (1.2 × 10 25 dyn cm for the second, 0.23 × 10 25 for the first) in terms of seismic moment and was also shallower (12 km, whereas the first subevent was at 15 km). The two subevents probably occurred on a north dipping listric fault but may have occurred on two subparallel faults. These features were determined by studying a variety of phases including teleseismic P and SH and regional P nl . The Whittier Narrows earthquake was a high stress drop event, but a single value for stress drop cannot be obtained because of the complex nature of the source. If we define the fault area as the aftershock area, we obtain a stress drop of about 750 bars." @default.
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- W2004482588 date "1989-07-10" @default.
- W2004482588 modified "2023-10-18" @default.
- W2004482588 title "Source complexity of the October 1, 1987, Whittier Narrows earthquake" @default.
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- W2004482588 doi "https://doi.org/10.1029/jb094ib07p09548" @default.
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