THE MAGNITUDE 6.0 NAPA, CA EARTHQUAKE 3:20 AM, AUGUST 24, 2014 Dr. Walter Hays US Geological Survey (Retired) Global Alliance for Disaster Reduction

The M6.0 Napa earthquake was the strongest in the San Francisco Bay area since the M Loma Prieta quake, BUT it only had about 1/30 th of Loma Prieta’s energy release

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

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

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.

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.

DAMAGEDAMAGE PHYSICAL EFFECTS CAUSE SOCIETAL IMPACTS AND RISK COLLAPSECOLLAPSE LOSS OF FUNCTION ECONOMIC LOSS RISKRISK

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.

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

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

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

AUGUST 27, 2014 PROPERTY DAMAGE ESTIMATE: $1 Billion

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”