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”
