1 / 10

Gretchen C. Schmauder 1,2 , John N. Louie 1,3 ,

Simulation of Seismic-Wave Propagation Through the Lake Tahoe Basin, Calif.-Nevada: A Scenario Approach to Probabilistic Shaking Hazard. Gretchen C. Schmauder 1,2 , John N. Louie 1,3 , Satish Pullammanappallil 2 , Kyle Gray 1 , Kevin McBean 1 , Alexa McBean 1 , & Graham M. Kent 1

pembroke
Download Presentation

Gretchen C. Schmauder 1,2 , John N. Louie 1,3 ,

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Simulation of Seismic-Wave PropagationThrough the Lake Tahoe Basin,Calif.-Nevada: A Scenario Approach toProbabilistic Shaking Hazard Gretchen C. Schmauder1,2, John N. Louie1,3, Satish Pullammanappallil2, Kyle Gray1, Kevin McBean1, AlexaMcBean1, & Graham M. Kent1 Nevada Seismological Lab. & Dept. Geol. Sci. & Engin., Univ. of Nevada, Reno NV, USA Optim SDS, 200 S. Virginia St. Suite 560, Reno, NV USA; gretchens@optimsds.com visiting Victoria University of Wellington to August 2014 Thanks to: J. M. Maloney (Univ. of Calif. San Diego); Edgetech; Watershed Sciences; Tahoe Regional Planning Agency; U.S. Forest Service crack.seismo.unr.edu/NSZ

  2. 1) FindingEarthquake Source Faults: • Marine CHIRP under Lake Tahoe • Dense LiDAR under trees • Results: • Only 3 faults! • (Pyramid L. has 100s) • All normal, N-strike, E-dip, E-W extension • M7.5 events in record SF LV LA

  3. CHIRP images sediments to 70 m below lake bottom with 25 cm resolution Edgetech acoustic Compressed High Intensity Radar Pulse (CHIRP) With Univ. of California, San Diego Slide/gravity deposits seen throughout Tahoe; dated & correlated by Shane Smith.

  4. Watershed Sciences airborne Light Detection and Ranging (LiDAR) imagery over 232,000 acres in the Tahoe basin

  5. 2) Gravity and ReMi™ Assess Wave Trapping in Basins, and Geotechnical Amplification Assembled Basin Thickness

  6. Assembled Vs30 Assembled Vs30 Map 200-m Grid Vs

  7. 3) Shake- Zoning Scenario Predictions Using Physics and Geology Intense 3D basin effects PGV Shaking Map     NSZWTDPF Rupture from South • Large motions for: • Steep slopes • Small subbasins

  8. How to explain hazard to the community?4) Probabilistic Mapping with ShakeZoning Scenarios Frankel et al. USGS Seattle Basin – Annual Probability of Exceedance λ: • Sum up a limited number of scenarios: faults; rupture directivities. • Examine Annual Rate of Exceedance (A.R.E.) of μ0=30 cm/s. • Conflate PGV > 30 cm/s with higher A.R.E.; <30 cm/s, lower A.R.E.

  9. Shaking Map to Hazard Map PGVrate WTDPF So. Rupture, One Scenario PGV rate 7x10-5/year PGV Shaking Map A.R.E. Map 

  10. Now add up the A.R.E.s for the 6 fault scenarios:Result: a simple tool promoting resilience

More Related