2002 Taiwan earthquake
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]
 Shakemap of the 2002 Taiwan earthquake | |
  Taipei Hualien  | |
| UTC time | 2002-03-31 06:52:52 |
|---|---|
| ISC event | 2944860 |
| USGS-ANSS | ComCat |
| Local date | March 31, 2002 |
| Local time | 14:52:52 |
| Magnitude | 6.8 ML， 7.1 Mw |
| Depth | 13.8 kilometres (9 mi) |
| Epicenter | 24.279°N 122.179°E[1] |
| Type | Reverse |
| Tsunami | 20 cm |
| Aftershocks | May 15, 2002 11:46:5.9 （6.2ML） |
| Casualties | 5 dead, 213 injured |
Tectonic setting
Taiwan has a history of many 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 all been 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 caused 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. A high-rise building in the city, which was under construction, partly collapsed, killing five workers and injuring a further 10 people. There was disruption to supplies of electricity, water and gas. The northeastern coastal areas were affected by many landslides. In total, there were 5 deaths and 213 people reported injured.[2]
References
- USGS. "M 7.1 - Taiwan region".
- United States Geological Survey (18 April 2002). "Hua-lien, Taiwan Earthquake of 31 March 2002" (PDF). Retrieved 18 April 2020.
- 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.