THE MAGNITUDE 6.0 NAPA , CA EARTHQUAKE

3:20 AM, AUGUST 24, 2014

The M6.0 Napa earthquake was the strongest in the San

Francisco Bay area since the M6.9 1989 Loma Prieta quake, BUT it only had about 1/30th of

Loma Prieta’s energy release

SAN FRANCISCO BAY AREA

• The Bay Area is prone to large earthquakes because it straddles the boundary between two major tectonic plates — the North American and Pacific plates.

SAN ANDREAS, HAYWARD, AND OTHER FAULT ZONES

EARTHQUAKE SCENARIOS

A DISASTER RISK REDUCTION TECHNIQUE FOR USE IN ANY EARTHQUAKE-PRONE AREA

NORTHERN CALIFORNIA SCENARIO

(developed in 2008)

BASED ON INTEGRATED KNOWLEDGE FROM MONITORING, RESEACH, AND POSTEARTHQUAKE STUDIES SINCE

APRIL 1906

EARTHQUAKE PROBABILITIES WORKING GROUP

EARTHQUAKE PROBABILITIES WORKING GROUP

EARTHQUAKE PROBABILITIES WORKING GROUP

SAN FRANCISCO BAY AREA SCENARIO

• Much of the stress release happens on the San Andreas fault, but some of it is relieved by the Hayward fault and other smaller parallel faults.

A HAYWARD FAULT SCENARIO

• Because of its location in the densely populated Bay area of 7 million people, a Hayward fault quake is likely to cause worse societal impacts than a San Andreas quake and be one of the nation's largest natural disasters.

HAYWARD FAULT SCENARIO

DAMAGEDAMAGE

PHYSICAL EFFECTS CAUSE SOCIETAL IMPACTS AND RISK

PHYSICAL EFFECTS CAUSE SOCIETAL IMPACTS AND RISK

COLLAPSECOLLAPSE

LOSS OF FUNCTIONLOSS OF FUNCTION

ECONOMIC LOSS

ECONOMIC LOSS

RISKRISK

HAYWARD FAULT SCENARIO IN SAN FRANCISCO BAY AREA

• Damage will be extensive to buildings and infrastructure.•The region's transportation infrastructure and water delivery systems are expected to take a major hit in a M7.0 or greater earthquake.

CONCLUSION: HAYWARD FAULT SCEN-ARIO IN SAN FRANCISCO BAY AREA

• A M7.0 earthquake on the Hayward fault, WHICH HAS NOT YET HAPPENED, will cause an estimated $210 billion dollars in damage.

BAD NEWS FOR CALIFORNIANS: The Napa quake occurred on a a

relatively unknown and unmonitored small fault segment,

(of which there are hundreds)not the well known and much

longer San Andreas and Hayward fault zones

LOCATION: AUGUST 24 NAPA VALLEY EARTHQUAKE

LOCATION: AUGUST 24 NAPA VALLEY EARTHQUAKE

USGS’ SHAKE MAP: AUGUST 24 NAPA VALLEY EARTHQUAKE

AUGUST 24: EARLY REPORTS OF SOCIOECONOMIC IMPACTS

• Local damage to buildings and houses, and infrastructure • Injuries, but no deaths (yet)• Damage to interior contents of

homes and stores• Loss of power, gas, and water for

70,000

DAMAGE: AUGUST 24 NAPA VALLEY EARTHQUAKE

DAMAGED BUILDING WERE CORDONED OFF

DAMAGE: NAPA COUNTY SIPREME COURT BUILDING

RUBBLE FROM THE COUNTY COURT HOUSE

DAMAGE: CORNER OF AN UPPER FLOOR OF A BUILDING

INJURIES: PEOPLE HURT IN THE DARK: ESPECIALLY FROM CUTS FROM GLASS

DAMAGE TO INTERIOR CONTENTS: AUGUST 24 NAPA VALLEY EARTHQUAKE

DAMAGE TO INTERIOR CONTENTS: AUGUST 24 NAPA VALLEY EARTHQUAKE

AUGUST 24: EARLY REPORTS OF SOCIOECONOMIC IMPACTS

• Damage to Highway 12• fires, especially in mobile homes• Damage to wine barrels• Damage to vineyards, which were

scheduled for harvest the next day• Aftershocks

DAMAGE TO HIGHWAY 12: AUGUST 24 NAPA VALLEY EARTHQUAKE

DAMAGE TO HIGHWAY 12: AUGUST 24 NAPA VALLEY EARTHQUAKE

BURNED OUT MOBILE HOME: AUGUST 24 NAPA VALLEY EARTHQUAKE

The quake's timing was also bad for Napa Valley's famed

vineyards, where winemakers are about one month away from

harvesting the 2014 crop.

DAMAGE TO WINE BARRELS: AUGUST 24 NAPA VALLEY EARTHQUAKE

Thousands of bottles of wine were broken and hundreds of

barrels of wine in storage were toppled.

AFTERSHOCKS: Buildings that were damaged or overstressed by the M6.0 quake

may be more susceptible to collapse from its aftershocks.

EVERY TIME AN EARTHQUAKE DISASTER OCCURS, WE HAVE NEW KNOWLEDGE TO ADD TO OUR “BOOKS OF KNOWLEDGE”