2002 Taiwan earthquake

2002 Taiwan earthquake
331大地震震度圖
Shakemap of the 2002 Taiwan earthquake
2002 Taiwan earthquake is located in Taiwan
Taipei
Taipei
Hualien
Hualien
2002 Taiwan earthquake
UTC time2002-03-31 06:52:52
ISC event2944860
USGS-ANSSComCat
Local dateMarch 31, 2002 (2002-03-31)
Local time14:52:52
Magnitude6.8 ML，
7.1 Mw
Depth32.8 kilometres (20 mi)[1]
Epicenter24°16′44″N 122°10′44″E / 24.279°N 122.179°E / 24.279; 122.179[1]
TypeReverse
Max. intensityMMI VII (Very strong)
Tsunami20 cm
AftershocksMay 15, 2002 11:46:59
（6.2ML)
Casualties5 dead, 213 injured

At 14:52 local time on 31 March 2002, an earthquake of magnitude 7.1 on the moment magnitude scale hit Taiwan. The epicenter was offshore from Hualien, which was the most severely affected area with a maximum felt intensity of VII (Very strong) on the Mercalli intensity scale.[1] At least 5 deaths have been reported, with a further 213 injured.[2]

Tectonic setting

Taiwan has a history of strong earthquakes.[1] The island is located within a complex zone of convergence between the Philippine Sea plate and Eurasian plate. At the location of the earthquake, these plates converge at a rate of 78 mm per year. To the south of Taiwan, oceanic crust of the Eurasian plate is subducting beneath the Philippine Sea plate creating an island arc, the Luzon Arc. At Taiwan the oceanic crust has been entirely subducted and the arc is currently colliding with continental crust of the Eurasian plate. To the north of Taiwan the Philippine Sea plate is in contrast subducting northwards beneath the Eurasian plate, forming the Ryukyu Arc.[3] Within 200 km of this earthquake, there have been nine events of M≥7 during the preceding 40 years, including the M 7.7 1999 Jiji earthquake which resulted in over 2,400 deaths.[1]

Earthquake

The earthquake had a magnitude of 7.1 Mwc  with a hypocentral depth of 32.8 km. The depth and focal mechanism are consistent with moderate angle reverse faulting on the plate boundary interface that dips northwards beneath the western end of the Ryukyu arc.[1]

Tsunami

A small tsunami (20 cm) was observed on Yonaguni, in the Yaeyama Islands.[2]

Damage

There was significant damage to buildings in the Taipei area, with three collapsing and the destruction of about 100 houses. An apartment building in the central part of the city collapsed, trapping 13 and injuring five.[4] Cranes at the then Taipei World Financial Center,[4] which was under construction, partly collapsed, killing five workers and injuring a further 10 people. At another construction site, scaffolding fell from a building.[5] There was disruption to supplies of electricity, water and gas. The Taipei metro train services were suspended due to a ruptured water pipe. Large cracks appeared in a city bridge. In Hualien, landslides blocked a highway and injured a child.[4] The northeastern coastal areas were affected by many landslides. In total, there were 5 deaths and 213 people reported injured.[2] Reports of shaking came as far as Hong Kong.[5]

See also

References

  1. ^ a b c d e f "M 7.1 – Taiwan region". United States Geological Survey.
  2. ^ a b c "Hua-lien, Taiwan Earthquake of 31 March 2002" (PDF). United States Geological Survey. 18 April 2002. Retrieved 18 April 2020.
  3. ^ Molli G.; Malavieille J. (2010). "Orogenic processes and the Corsica/Apennines geodynamic evolution: insights from Taiwan". International Journal of Earth Sciences. 100 (5): 1207–1224. doi:10.1007/s00531-010-0598-y. S2CID 129517282.
  4. ^ a b c "Toll rises after Taiwan quake". CNN. 2 April 2002. Retrieved 13 June 2022.
  5. ^ a b "4 Dead in Taiwan Earthquake – 2002-03-31". Voice of America. 29 October 2009. Retrieved 13 June 2022.