MAGNITUDE 6 3 EARTHQUAKE STRIKES TAIWAN 7 02
- Slides: 23
MAGNITUDE 6. 3 EARTHQUAKE STRIKES TAIWAN (7: 02 pm, October 31, 2013) Walter Hays, Global Alliance for Disaster Reduction, Vienna, Virginia, USA
LOCATION MAP
7: 02 PM, OCTOBER 31, 2013 • At 7: 02 pm, a magnitude 6. 3 earthquake occurred 45 km (28 miles) southwest of the coastal city of Hualian. • The shallow depth of 12 km (7. 5 mi) exacerbated the ground shaking. • Buildings over a wide area, including Taipei, the capital city, were shaken.
EACH EARTHQUAKE IS AN OPPORTUNITY TO ADD TO THE “GLOBAL BOOK OF KNOWLEDGE” ON OCCURRENCES, CONSEQUENCES, AND DISASTER RISK REDUCTION MEASURES
A NOTE ON THE PAST A magnitude 7. 6 earthquake in central Taiwan in 1999 killed 2, 416 people
THE JI JI, TAIWAN EARTHQUAKE M 7. 6 Shallow depth (about 2 km) 1: 47 am SEPTEMBER 21, 1999
JI JI, TAIWAN EARTHQUAKE BASED ON REPORTS BY USGS, EERI, ASCE/TCLEE, MCEER, TAIWAN AGENCIES, AND OTHERS
JI JI, TAIWAN EARTHQUAKE
JI JI, TAIWAN EARTHQUAKE
THE MAIN SHOCK WAS FOLLOWED BY 9, 000+ AFTERSHOCKS OVER 2 YEARS
JI JI, TAIWAN EARTHQUAKE • The 1999 Taiwan earthquake was a subduction zone earthquake caused by interaction of the Philippine plate with the Eurasian plate.
EARTHQUAKE FAULT • The quake was generated by slip on the Chelongpu fault.
PHYSICAL EFFECTS: GROUND SHAKING • Strong motion records showed that ground shaking was characterized by long-period energy related to the magnitude and local site conditions. • It was several times greater than the level prescribed in the building code.
SEISMIC DESIGN MAP IN BUILDING CODE
SOCIOECONOMIC IMPACTS • 44, 338 buildings collapsed, and an additional 41, 336 houses and buildings were severely damaged. • Twenty 10 - to 20 -story residential buildings either collapsed or experienced significant damage, suggesting frequency-dependent site amplification.
SOCIOECONOMIC IMPACTS • Strong ground shaking from the main shock and its large aftershocks caused the collapse of a few mid-rise buildings in Taipei, the capital, which is located about 140 km north of the epicenter in a deep alluvial basin.
SOCIOECONOMIC IMPACTS • Strong ground shaking, ground failure, and surface fault rupture caused power outages and severe lifeline damage. • Some examples of lifeline damage had not been observed in other earthquakes. .
SOCIOECONOMIC IMPACTS • The loss of power had wide ranging effects, including disruption of Taiwan’s semiconductor fabrication facilities.
PHYSICAL EFFECTS: SURFACE FAULTING • The regional compression caused thrust faulting. • Over 60 km of surface faulting with lateral and vertical displacements reaching 9 m and 5 m, respectively, occurred in the center of the Island.
SOCIOECONOMIC IMPACTS • Most of the bridges that suffered significant damage were located in the area bounded by two thrust faults that ruptured the surface.
PHYSICAL EFFECTS: LIQUEFACTION • Liquefaction caused damage in a residential neighborhood of Yuanlin located in Changhua County. • Extensive liquefaction-induced damage was also observed in parts of Taichung Harbor.
SOCIOECONOMIC IMPACTS • The death toll reached 2, 416. • 11, 446 were injured. • Economic losses reached $9. 2 billion. • Short-term global stock market prices were influenced by impacts on the semi-conductor industry.
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