Near Surface P- and S-Wave Velocity Measurements HAR Harbor Island, Seattle, WA Surface Refraction Data Interpretation: An east-west profile located in an industrial area near the north end of Harbor Island. This site is in a region that is mapped as artificial fill at the surface. (Waldron et al., 1980). Waldron, H. W., Liesch, B. A., Mullineaux, D. R., and Crandell, D. R., 1962, Preliminary geologic map of Seattle and vicinity, Washington, U.S. Geological Survey Miscellaneous Geologic Investigations Map I-354, 1:31680. P-vel (m/s) Depth (m) S-vel (m/s) Depth (m) 224 0.0 101 0.0 224 2.0 101 5.5 427 2.0 134 5.5 427 30.0 134 12.0 173 12.0 173 30.0 Seismic Recording Parameters Recording system Geometrics StrataView (30 channels activated) Sampling interval 0.001 seconds Record length 1 second Geophones Thirty 4.5-Hz horizontal; thirty 8-Hz vertical Geophone array linear with single phones at 3-m intervals Seismic Source 4.0 kg sledgehammer, vertical impact on steel plate (P-wave); 4.0-kg sledgehammer, lateral impact on wood timber (S-wave) Source array Reversed spreads with multiple off-end shots

P/S Velocity | Site Response | PACNW | Earthquake Hazards | USGS Modified Tuesday, October 30, 2001 by Susan Rhea This URL is: http://earthquake.usgs.gov/regional/pacnw/siteresp/svel/sitemap/har/index.html