The Great Southern California ShakeOut November 12-16, 2008 A week of special events to inspire southern Californians to get ready for big earthquakes.

The Great Southern California ShakeOut• November 12-16, 2008

• A week of special events to inspiresouthern Californians to get ready forbig earthquakes

• Region-wide earthquake drill Nov. 13– millions of participants: schools, families,

community groups, business, etc.– UCLA, UC Riverside, UC Irvine and a

number of other SC universities are participating with all staff, students and faculty

• Los Angeles International EarthquakePolicy Conference

• Concurrent with statewide “GoldenGuardian” emergency exercise:largest ever this year.

ShakeOut scenario: Facts

Southern San Andreas Fault

Quiescence period: 300+ years

Slip rate: 20-28 mm/yr

Surface velocity mapderived from imagery collected byspace-borne radar satellites

Epoch: 1992-2000

Fialko, Nature 2006

Bottom line: the fault is storing energy25 mm/yr x 300 yrs = 7.5 m (24 ft) of slip

• Southernmost San Andreas

• 180 mile rupture

• Magnitude 7.8

• 100 seconds of fault rupture

• Shaking for over 2minutes in many places

• USGS-led effort of many scientists, engineers,and others to create arealistic scenario of what willhappen.

One Possible “Big One”

Shaking of Long Duration

Widespread Strong Ground Shaking

+ Shaking of Long Duration =

300,000 buildings significantly damaged

Widespread infrastructure damage

$213 billion damages

270,000 displaced persons

50,000 injuries

1,800 deaths

ShakeOut Scenario “Disaster Equation”

• 300,000 significantly damaged (1 in 16)– repairs cost at least 10% of replacement cost

• 45,000 complete losses (1% of all buildings)

• Unreinforced masonry (most dangerous)– 300+ complete collapses– most near the fault will be destroyed – Retrofitting will save lives

• Older concrete buildings (almost as dangerous)– 50 collapses

• 10% of this type in highest shaking areas may collapse• 5 pancake collapse, 45 partial collapse

– 100 red tagged buildings– 5,000 – 10,000 people in collapsed buildings (most survive)

• Pre-1994 Steelframe buildings (at risk, but less dangerous)– High rises will receive intense long-period shaking– Scenario assumes 5 collapses (not necessarily complete collapse)– 10 red tags– 11-15 stories, up to 1,000 occupants each

• Woodframe buildings (most numerous) – 175,000 wood buildings significantly damaged (1 in 25)

1994 Northridge CA

Building Damage

1992 M7.1 Mendocino

Kobe, Japan 1995