Descr: We will acquire a continuous profile of shallow shear-velocity measurements across the Los Angeles and San Gabriel Valley basins. The profile will use the refraction microtremor method of Louie (2001). An array of 45-120 Texans with 4.5-Hz phones will be laid out at 20-m intervals along the San Gabriel River Bike Path, and rolled along in 15-sensor increments. Each array increment is kept in place at least 10 minutes to record microtremor noise. Fieldwork is expected to take 17 full days. Equipment will be in the field 20-25 days.
