The 1868 Hayward

Earthquake Alliance

Tom Brocher

Alliance ChairUSGS, Coordinator,

NC Earthquake Hazard Investigations

http://earthquake.usgs.gov/

1868 ShakeMap, Boatwright and Bundock

1868 Hayward EarthquakeTuesday, 0ctober 21st marks the 140th anniversary of the

1868 Hayward quake: the past five S. Hayward Fault earthquakes have been 140 years apart on average

Lienkaemper and Williams

Who is the Alliance?

85 organizations

1868alliance.org

KPIX CBS5 Video

California Emergency Services Association, Coastal RegionCalifornia Emergency Services Association, Coastal Region March 12th meeting at the USGS Menlo ParkMarch 12th meeting at the USGS Menlo Park

1868 Hayward1868 HaywardEarthquakeEarthquake

““the great San the great San Francisco Francisco

earthquake”earthquake”

Shaking intensities Shaking intensities were strong from were strong from San Leandro south San Leandro south through Hayward through Hayward towards Alvaradotowards Alvarado

They were weaker They were weaker in Oakland andin Oakland andMission San JoseMission San Jose

~M7 1868 Hayward earthquake

• 30 fatalities, 5 in San Francisco (12th most lethal in US earthquake)

• $350,000 (in 1868 dollars) in damage in San Francisco alone

• Extensive damage in San Leandro, Hayward, and Fremont (total population less than 2000)

• Bay Area population was 260,000 (it is now 27 times larger)

Haywards Hotel, Haywards, 1860s

Society of California Pioneers

Hotel

Hayward was heavily damaged by the 1868 earthquake. “Practically not a house was left on its foundations…” “Many buildings were much damaged.” (Lawson Report, 1908).

2nd Alameda Co. Courthouse, San Leandro

Society of California Pioneers

Courthouse

“At San Leandro the shock was more sensibly felt than at any other point on that side of the Bay. All the buildings were terribly shaken, adobes were thrown to the ground, brick structures, and even frame buildings were demolished. The Court House and County Jail were shaken down.”

San Francisco Morning Call, 22 Oct. 1868

SUMMARY: 12-EVENT MODEL AGESLienkaemper and Williams

1989 was NOT the big one for the East Bay!

Updating the 1996 EERI Hayward Fault Scenario

Catastrophe Risk Management

Exposures & expected losses: $120 billion direct economic loss, BART &

Bay Bridge connections to San Francisco broken,

80,000 homeless needing shelter assistance, 1100

road closures, 11% exposed population live in poverty, 27% foreign born,

500-2000 fatalities

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U.S. Dept. of Labor Bureau of Labor Statistics

Report

85,000 employers, 1.5 million

employees, $100 billion annual wages

exposed to strong shaking (VII+) by a

M6.9 Hayward Earthquake

Union City

Hayward

Newark

San LeandroPrioritize

Preparation Retrofits Rebuilds Codes

Stage supplies

Scientific instrumentation

Examples of new Hayward Fault related USGS Product Releases

• 1868 Hayward earthquake ShakeMap • Hayward Fault Lidar Data• “A Green Guide to the Hayward Fault” (mass

transit)• Hayward Fault in 3D• Animations of a Hayward Fault earthquake

showing ground motions ala 1906 movies• 1868 Hayward Earthquake Virtual Tour

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1868 Hayward Earthquake Alliance activities

• Commemoration Events• School earthquake drills• Public Service Announcements• Hayward Fault art installation• Teacher Tutorials• TV Specials• Hayward Fault Initiative (with EERI)• Scientific Conferences

www.1868alliance.org