Week5-SeismicHazardAnalysis_S11

Week5-SeismicHazardAnalysis_S11 - 1 CE 316 Geotechnical...

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Unformatted text preview: 1 CE 316 Geotechnical Earthquake Engineering Week 5 Seismic Hazard Analysis Seismic Hazard Analysis Identify seismic sources Evaluate seismic potential Evaluate intensity of ground motions Seismic Source Characterization Tectonic sources Earthquake sources Geologic evidence (fault scarps, shear zones, offset drainage, etc) Fault activity (slip rate, microseismicity) Volcanoes Historic and prehistoric evidence Tectonic Evidence Subduction zone and the potential Magnitude earthquake w.r.t. their age and convergence rate Geologic Evidence http://quake.wr.usgs.gov/research/geology/ Micro-Seismicity Evidence http://quake.wr.usgs.gov/prepare/factsheets/NewMadrid/ Prehistoric Evidence http://pubs.usgs.gov/of/of98-488/index.html Fault-Specific Characterization Geometry Location, length, dip angle, depth, distance to site Seismic potential Earthquake magnitude, activity, recurrence Style of faulting Strike-slip, dip slip, oblique slip Magnitude Indicators surface rupture rupture area maximum displacement e.g., M w = 3.98+1.02log(Area) for strike slip fault Historical & Instrumental Seismicity Written evidence of earthquakes, anecdotal and oral histories In the past 100 years earthquakes have been measured with instruments. That data is available to study and identify the seismic sources. Quality of data has varied with time. Relatively a limited amount of data to study geologic features. Seismic Source Characterization in Central & Eastern US Plate tectonics inadequate to explain intraplate earthquakes Earthquake source zones related to subsurface crustal structures, but no surface expression Strain (i.e., slip) rates not consistent with other Strain (i....
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This note was uploaded on 02/27/2011 for the course CIV ENG 316 taught by Professor Louis during the Spring '11 term at Missouri S&T.

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Week5-SeismicHazardAnalysis_S11 - 1 CE 316 Geotechnical...

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