Dry SHIPS was a seismic refraction study of the Seattle basin, Washington, involving 29 chemical explosions recorded by 1008 seismographs, conducted in September 1999. The E-W-trending Dry SHIPS line ran eastward from the Olympic Peninsula, through the Seattle basin, to the foothills of the Cascade mountains. Twenty-eight REFTEKs (DAS Model 07G; 24-bit) deployed along the Dry SHIPS line at 4-km intervals were programmed to record data continuously from three-component sensors. These 28 stations recorded the mainshock and several aftershocks of the Mw 7.6 Chi-Chi earthquake (Shin et al., 2000; Brocher et al., 2000a).

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The recordings were...

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