Southern San Andreas Earthquake Scenario Faulting and Shaking Kenneth W. Hudnut U. S. Geological Survey Earthquake Country Alliance Southern California.

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Presentation transcript:

Southern San Andreas Earthquake Scenario Faulting and Shaking Kenneth W. Hudnut U. S. Geological Survey Earthquake Country Alliance Southern California Association of Governments Los Angeles, California 18 April 2008 U.S. Department of the Interior U.S. Geological Survey

Economic Activity Time Projected activity For one specific natural hazard event: ‘Disaster’ (a few yrs.) ‘Catastrophe’ (decades) event

A San Andreas “Big One” is far bigger than Northridge 1994 What is meant by “Big One” exactly…? - fault length is 300 km (15 x) - rupture duration is 90 sec (10 x) - shaking duration is 180 sec (15 x) M 7.8 “great” >> M 6.7 amplitude (15 x) & energy (~30 x)

ShakeOut Scenario Earthquake Not a prediction - a plausible event First step: define the rupture length ? ?

Possible early/pre-historic earthquake rupture correlations: - Conservative correlations result in 6 events in 1200 years - Recurrence Interval ~150 years without latest ‘open’ interval - Currently, elapsed time of ~ 300 years appears longer than any previous recurrence interval A call for the most reliable data: Hard data versus soft data Examples: SoSAFE Project, B4 LiDAR project on San Andreas, multi-investigator trench studies Courtesy of Gordon Seitz, Pat Williams, Ray Weldon & Belle Philobosian Digging deep into the San Andreas fault, because the past may be the key to the future

M w 7.8 ‘ShakeOut’ Scenario (GG’08 Nov. 13, 2008) San Andreas ‘Really Big One’ simulated earthquake Initiation near Bombay Beach (unilateral rupture to the NW) Disruption of critical lifeline infrastructure (freeway, internet, power and gas lines) along surface rupture; Slip of 3-4 meters at Cajon Pass (I-15) Strong shaking throughout the region, including urban areas Surface Slip and Modified Mercalli Intensities for ShakeOut scenario earthquake Credit: Rob Graves (SCEC-CME; URS / USC) Brad Aagaard (USGS); ShakeMap Integration thanks to Vince Quitoriano (USGS) and Wan Lin (USGS)

Caltrans freeways and critical lifeline infrastructure fault crossings STOP GO Lifelines: white is power, yellow is gas and fuel, light blue is fiber optic, black is rail, orange is freeway and highway system I-5 is OK; I-15 and I-10 badly damaged & require repairs YOU ARE HERE

Elizabeth Lake Tunnel (LADWP) W = 9.5’ Slip: 3.5 m = 11.5’

Cajon Pass Lifelines

Rupture unzips SE to NW, taking 90 seconds; Shaking lasts >3 min.’s in LA & Ventura Southern California Earthquake Center

Tall Buildings Carefully modeled ground motions and had expert structural engineers assess potential damage: Pre-1994 welded steel moment frame Non-ductile reinforced concrete moment frame And, of course… Un-Reinforced Masonry, e.g., San Bernardino Mexico City, 1985 Kobe, 1995

Structural Engineering tall building panelists’ expert* opinion: Given the ShakeOut earthquake scenario ground motions: The fact that there were no collapses in previous US earthquakes cannot be taken as evidence that there would not be collapses in this scenario. In fact, the possibility of some collapses is quite credible. Ron Hamburger (Simpson Gumpertz and Heger, San Francisco) Jim Malley (Degenkolb Engineers, San Francisco) Greg Deierlein (Stanford University) Swaminathan Krishnan (Caltech) Organizer: Keith Porter (Univ. of Colorado and SPA, Boulder) *

Onset and Duration of Shaking

Drinking Water: 1 gal. per person, per day x 7 days Family of 5: 35 gallons Need plenty at work, in the car and at home