Simulation and Validation: NGA East Ralph Archuleta Department of Earth Science University of California, Santa Barbara DCPP Seismic Hazard Nov. 30, 2011 With funding from the US Nuclear Regulatory Commission (NRC), and in collaboration with the US Geological Survey (USGS) and national experts, the Pacific Earthquake Engineering Research Center has initiated a comprehensive multidisciplinary program to develop Next Generation Attenuation Relationships for the Central and Eastern North-America (NGA-East). (From PEER NGA East Website)
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Simulation and Validation: NGA East
Ralph Archuleta Department of Earth Science
University of California, Santa Barbara
DCPP Seismic Hazard Nov. 30, 2011
With funding from the US Nuclear Regulatory Commission (NRC), and in collaboration with the US Geological Survey (USGS) and national experts, the Pacific Earthquake Engineering Research Center has initiated a comprehensive multidisciplinary program to develop Next Generation Attenuation Relationships for the Central and Eastern North-America (NGA-East). (From PEER NGA East Website)
Finite Fault Simulation Working Group NGA East
• Pacific Engineering (W. Silva) • Regional Academy of Natural Science (A.
Bykovstev) • San Diego State/ETH (K. Olsen) • UCSB (R. Archuleta) • URS (P. Somerville) • USGS (Y. Zeng*)
DCPP Seismic Hazard Nov. 30, 2011
World Stress Map Project
DCPP Seismic Hazard Nov. 30, 2011
Focal Mechanisms Mostly in US
M > 3.0, 1993-2003: Saint Louis University Earthquake Center DCPP Seismic Hazard Nov. 30, 2011
Focal Mechanisms in Middle America
M > 3.0, 1993-2003: Saint Louis University Earthquake Center DCPP Seismic Hazard Nov. 30, 2011
Mineral Virginia Aug. 23, 2011 Mw 5.8
Afershocks from Saint Louis University Earthquake Center
DCPP Seismic Hazard Nov. 30, 2011
Earthquakes for Simulations Validation There are seven earthquakes that will be used in the validation. Listed in order to perform the validation study:
2005 Riviere du Loup -- Mw 4.6 1988 Saguenay – Mw 5.8 2000 Tottori – Mw 6.7 *2011 Mineral, VA – Mw 5.8 Will be done before others. 1994 Northridge – Mw 6.7 1989 Loma Prieta – Mw 7.0 1979 Imperial Valley – Mw 6.6 1999 Chi Chi – Mw 7.6 For each earthquake the fixed parameters and the station locations are given. The validation has several elements. The first is to determine a faulting model that has minimum bias and standard deviation of the spectral acceleration response spectrum (5% damped) at periods of 10 s, 7.5 s, 5.0 s, 4.0 s, 3.0 s, 2.0 s, 1.5 s, 1.0 s, 0.5 s, 0.3 s, 0.2 s, 0.1 s and 0.05 s. The passband of the data may not allow comparisons at 10 s and 7.5 s.
DCPP Seismic Hazard Nov. 30, 2011
Simulation Parameters L: Rupture length. W: Rupture width. hTop: Vertical Depth to top of rupture plane. hypoStrike: Horizontal distance along strike from top center of rupture plane to the hypocenter, in local rupture plane coordinates. hypoDip: Vertical distance along dip from top center of rupture plane to the hypocenter, in local rupture plane coordinates. hypoLat: Latitude coordinate of hypocenter. hypoLon: Longitude coordinate of hypocenter. hypoDep: Vertical depth of hypocenter. M0: Seismic moment.
Why These? 2004 Parkfield – Mw 6.0: Station density, Large variations of peak amplitudes; large accelerations for small earthquake 1999 Hector Mine – Mw 7.0: Complicated by multiple faults; geometry similar to Hosgri-Shoreline 1995 Kobe – Mw 6.9: Relevant to Hayward rupture 2011 Tohoku– Mw 9.1: Analog for Cascadia rupture 2000 Tottori – Mw 6.7: Classic strike-slip rupture, blind! 1994 Northridge – Mw 6.7: Obvious relevance, blind thrust 1989 Loma Prieta – Mw 7.0: Mixture of strike-slip and reverse 1979 Imperial Valley – Mw 6.6: Ground motion in a deep sedimentary basin. 1999 Chi Chi – Mw 7.6: Analog for Sierra Madre-Cucamonga rupture 2011 Tohoku– Mw 9.1: Analog for Cascadia rupture
DCPP Seismic Hazard Nov. 30, 2011
Additional? 2004 Chuetsu – Multiple M > 6 events. Data are close to sources, hanging wall effects. 1999 Hector Mine – No good close in data. 2007 Chuetsu– Mw 6.8 (?) 2008 Iwate-Miyagi (sp?)– Mw 6.8 (?) Good hanging wall data, broke surface 2010 Darfield – Mw 7.0
