Nevada ShakeZoning Model of the 5/22/15 Caliente M5.3 Event  136 km from Las Vegas I15- I515 interchange  Two overpasses suffered joint-fill damage –

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Presentation transcript:

Nevada ShakeZoning Model of the 5/22/15 Caliente M5.3 Event  136 km from Las Vegas I15- I515 interchange  Two overpasses suffered joint-fill damage – MMI V?  Traffic impeded for hours  Mostly MMI 2-3 reports in Las Vegas Val.  MMIs above prediction at all distances Steve Marcus, Las Vegas Sun USGS CIIM

Nevada ShakeZoning Model of the 5/22/15 Caliente M5.3 Event  Many geological basins between event, Las Vegas  NSZ uses 3D basins & Clark Co. Parcel Map  Modeled shaking up to 0.2 Hz in a few hours of physics- based computation

Nevada ShakeZoning Model of the 5/22/15 Caliente M5.3 Event  Basin waveguides channel, amplify, and prolong earthquake shaking  Geotech heterogeneity shown by Parcel Map traps more shaking 3D NSZ Shaking Map 1D USGS ShakeMap 3D NSZ PGVs (cm/s, blue) show 5x to 10x basin amplification 3D NSZ matches recorded PGVs (cm/s, red) to factor of two

Nevada ShakeZoning Model of the 5/22/15 Caliente M5.3 Event  Deep LV basin amplified and extended low-frequency shaking to MMI IV, damaging bridge joints 3D NSZ Shaking Map 3D NSZ PGVs (cm/s, blue) show 5x to 10x basin amplification 3D NSZ matches recorded PGVs (cm/s, red) to factor of two

Nevada ShakeZoning Model of the 5/22/15 Caliente M5.3 Event, MMI Colors 3D NSZ Shaking Map 1D USGS ShakeMap 3D NSZ PGVs (cm/s, blue) show blue- green MMI IV in Las Vegas Val. Basin trapping gives 1/3 the shaking in bedrock areas, purple MMI II