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The ShakeOut Scenario What will a big San Andreas earthquake really be like?

November 12–16, 2008. The ShakeOut Scenario What will a big San Andreas earthquake really be like? The impact of a major earthquake on critical infrastructure Ken Hudnut & Team ShakeOut. San Bernardino County Operational Area MPC GG’08 - 30 July 2008. USGS Multi-Hazard Demo Project.

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The ShakeOut Scenario What will a big San Andreas earthquake really be like?

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  1. November 12–16, 2008 The ShakeOut Scenario What will a big San Andreas earthquake really be like? The impact of a major earthquake on critical infrastructure Ken Hudnut & Team ShakeOut San Bernardino County Operational Area MPC GG’08 - 30 July 2008

  2. USGS Multi-Hazard Demo Project • Lucy Jones, Chief Scientist • Dale Cox, Project Manager • Suzanne Perry, Staff Scientist • Earthquake Scenario Coordinators: • Dan Ponti, Anne Wein, Rich Bernknopf, and Ken Hudnut (all at USGS), Mike Reichle and Jerry Treiman (CGS), Keith Porter and Dennis Mileti (Univ. of Colorado), Jim Goltz (OES), Hope Seligson (MMI Eng.), and Kim Shoaf (UCLA) • ShakeOut Earthquake Contributors - Source Description, Surface Faulting and Ground Motions: • Brad Aagaard and Ned Field (USGS), Rob Graves* (URS), Lisa Star and Jonathan Stewart (UCLA), Thomas Jordan,* Gideon Juve,* Philip Maechling,* David Okaya,* Scott Callaghan* (USC), Jacobo Bielak,* Ricardo Taborda,* Leonardo Ramirez-Guzman,* Julio Lopez,* and David O'Hallaron* (CMU) and John Urbanic* (PSC), Geoff Ely* (SDSU/UCSD), Kim Olsen,* Luis Dalguer* and Steve Day* (SDSU), Yifeng Cui,* Jing Zhu,* Timothy Kaiser,* Amit Chourasia,* and Reagan Moore* (SDSC), Chen Ji (UCSB), Swami Krishnan, Matt Muto and Jeroen Tromp (Caltech) * participant in the SCEC/CME collaboration, funded by the National Science Foundation

  3. San Andreas M 7.8 Shaking

  4. Fault Offset Landers, California M 7.3 - 1992 earthquake; ~1 meter (3 feet) offset

  5. Big Fault Offset! Wairarapa fault, New Zealand - 1855 earthquake; ~18 meter (54 feet) right-lateral offset

  6. Northridge 1994 over in 30 sec’s ShakeOut rupture unzips SE to NW, taking 90 seconds; Shaking lasts >3 min.’s in LA & Ventura

  7. Emergency Response With 13 million people at high shaking, mutual aid must come from far away when the transportation routes are damaged

  8. Economic impact ~$50 billion in shaking damages ~$65 billion fire damages ~$100 billion business losses Bottom line: $213 billion

  9. Buildings 300,000 significantly damaged (1 in 16) Significant: repairs cost at least 10% of replacement cost 45,000 complete losses (1%) Most dangerous (URM’s): Brick (retrofits needed) Older concrete Most numerous: Older wood Less dangerous: Steel buildings built before 1994 1933 Long Beach, CA 1994 Northridge CA

  10. Older reinforced concrete Older construction has less rebar, can lead to collapse Concrete construction has improved since 1970’s, but older buildings still remain 1000’s of low- and midrise buildings of this type 10’s of highrise buildings of this type 1971 San Fernando

  11. Older reinforced concrete ShakeOut study by UCLA: Computer analysis 50 collapses 5,000 – 10,000 people in collapsed buildings 100 red tagged buildings 1994 Northridge 1995 Kobe

  12. Woodframe buildings Most SoCal housing is wood Extensive damage in past earthquakes Common damage: Poorly anchored to foundation Weak cripple walls Soft story (e.g., tuckunder parking) Rely on stucco & gyp board Brick & stone chimneys Poorly anchored brick veneer Landslides Scenario: 175,000 wood buildings significantly damaged (1 in 25) 1992 Mendocino 5/2/83 M6.5 Coalinga 1989 M7.1 Loma Prieta

  13. Highrise steelframe buildings Connections fractured in Northridge Earthquake In Kobe (1995), 10’s of steel buildings collapsed No US buildings have collapsed, but ShakeOut is longer, stronger, and richer in damaging motion than Northridge. 600+ such buildings in study area

  14. Highrise steelframe buildings Caltech study for ShakeOut: Reviewed earthquake history of building type Performed sophisticated computer analyses Found collapse likely in large areas with highrise buildings Expert panel: Reviewed Caltech findings, found that: “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.” Scenario: 5 collapses 11-15 stories, 200,000-300,000 square feet Up to 1,000 occupants each 10 red tags 20 yellow tags Kobe, Japan 1995 Mexico City, 1985

  15. Infrastructure damage

  16. Infrastructure damage

  17. Electric power Panel of 10 experts from 5 agencies find: Immediate loss of power throughout region Collapse of some high-tension towers, damage to transformers on overhead poles Generating plants taken offline for inspection LA, Riverside, & San Bernardino Counties: 30-50% of service restored in 24 hrs 75-90% restored in 3 days ~100% restored within 1-4 months Ventura, Orange, & Imperial Counties: 90% restored in 2 days Kern & San Diego Counties: 90% restored in 24 hr Transmission lines & power plants 1971 San Fernando Earthquake

  18. Water supply Aqueducts & tunnels cross the fault in several places Also sensitive to landslide & liquefaction Older pipes damageable by shaking, liquefaction, … Some LA water & sewer pipe is 100+ yr old Groundwater supply needs power, pumps, tanks, and other damageable equipment 1971 San Fernando Earthquake 1994 Northridge Earthquake

  19. Water supply Expert panel: 19 reps from 8 agencies Within 10 miles of fault & isolated areas: damage impairs supply for up to 6 months Throughout much of study area, 1/2 of customers lose service for up to 1 week Loss of power, damage to pumps, tanks, etc. In Los Angeles, Riverside, San Bernardino Counties, 5% of customers lose service for 1-8 weeks

  20. Deaths & injuries Study by UCLA: 50,000 injured (to ER’s) 1,800 killed 900 from fires, 900 from shake-related building and transportation damage Vs. 8,300 injured, 33 killed in 1994 Northridge Earthquake Up to 2/3 of hospital beds unavailable in some counties Evacuation of Sherra Cox, 1989 Loma Prieta earthquake Olive View Medical Center1971 San Fernando earthquake

  21. Fire following earthquake 2 largest peacetime conflagrations: 1906 San Francisco, 1923 Tokyo. Why? Numerous simultaneous ignitions Degraded fire-resistive building features Reduced pressure in water mains Saturated communications Traffic impacts More fires than firefighting capabilities… this is what leads to conflagrations Special study by C. Scawthorn, SPA Risk Created procedures currently used by insurance industry Review panel: Donald Manning, retired chief, LAFD Donald Parker, California Seismic Safety Gerry Malais, LAFD Michael Reichle, California Geological Survey Larry Collins, LAFD USAR Task Force 103

  22. Fire following earthquake Study findings 1,600 ignitions requiring a fire engine 1,200 exceed capability of 1st engine Orange County & LA basin: dozens of large fires merge into conflagrations destroying 100s of blocks 200 million square feet burnt ≈ 133,000 single family dwellings Property loss: $65 billion No Santa Ana winds, not worst case 1989 Loma Prieta 1994 Northridge

  23. Why this is not worse (more like China) Inherently rugged construction Steadily improving building codes Highly trained and strictly licensed engineers and contractors Good code enforcement Enormous effort to upgrade highway bridges Extensive seismic work done by electric power utilities

  24. Mitigation works! Retrofitted freeways, structures, utilities reduced the losses Major capital investments Coalitions increase resilience

  25. The Great Southern California ShakeOut • November 12-16, 2008 • A week of special events that will inspire southern Californians to get ready for big earthquakes • Features a region-wide earthquake drill on Nov. 13 • millions of participants: schools, families, community groups, business, etc. • Los Angeles International Earthquake Conference • Public Rally/Festival in downtown Los Angeles • More at www.ShakeOut.org

  26. ShakeOut Schedule

  27. www.ShakeOut.org

  28. Publications Available USGS Circular #1324 (“play by play” action) handout copies The ShakeOut Scenario U.S. Geological Survey Open File Report 2008-1150 California Geological Survey Preliminary Report 25 version 1.0, 2008By Lucile M. Jones, Richard Bernknopf, Dale Cox, James Goltz, Kenneth Hudnut, Dennis Mileti, Suzanne Perry, Daniel Ponti, Keith Porter, Michael Reichle, Hope Seligson, Kimberley Shoaf, Jerry Treiman, and Anne Wein http://pubs.usgs.gov/of/2008/1150/

  29. November 13, 2008 at 10:00 a.m.www.ShakeOut.org

  30. www.ShakeOut.orgKenneth W. Hudnut, Ph.D. Geophysicist, USGS 525 S. Wilson Ave. Pasadena, CA 91106 hudnut@usgs.gov (626)583-7232

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