  | |
| UTC time | 1999-09-20 17:47:16 |
|---|---|
| ISC event | 1718616 |
| USGS-ANSS | ComCat |
| Local date | 21 September 1999 |
| Local time | 01:47:12 local time |
| Magnitude | 7.7 Mw 7.3 ML |
| Depth | 33 km (20.5 mi) |
| Epicenter | Jiji (Chi-Chi), Nantou, Taiwan 23°46′19″N 120°58′55″E / 23.772°N 120.982°E |
| Areas affected | Taiwan |
| Total damage | 51,711 buildings destroyed, 53,768 buildings damaged |
| Max. intensity | MMI X (Extreme)[1] JMA 6[1] |
| Peak acceleration | 1.92 g[2] |
| Peak velocity | 318 cm/s[3] |
| Casualties | 2,415 dead, 11,305 injured, 29 missing |
The Chi-Chi earthquake[4][5][6] (later also known as the Jiji earthquake[a] or the great earthquake of September 21[b]), was a 7.3 ML or 7.7 Mw earthquake which occurred in Jiji (Chi-Chi), Nantou County, Taiwan on 21 September 1999 at 01:47:12 local time.[2] 2,415 people were killed, 11,305 injured, and NT$300 billion worth of damage was done. It is the second-deadliest earthquake in Taiwan's recorded history, after the 1935 Shinchiku-Taichū earthquake.
Rescue groups from around the world joined local relief workers and the Taiwanese military in digging out survivors, clearing rubble, restoring essential services and distributing food and other aid to the more than 100,000 people made homeless by the quake. The disaster, dubbed the "Quake of the Century" by the local media, had a profound effect on the economy of the island and the consciousness of the people, and dissatisfaction with the government's performance in reacting to it was said by some commentators [who?] to be a factor in the unseating of the ruling Kuomintang party in the 2000 presidential election.[citation needed]
Every year on September 21 at 9:21 AM, a drill message is sent to all mobile phones through the Public Warning System in the form of a national alert.[7]
- ^ a b "Significant Earthquake Information". ngdc.noaa.gov. NOAA National Centers for Environmental Information. Retrieved 19 September 2021.
- ^ a b "M 7.7 – Taiwan". United States Geological Survey. Archived from the original on 20 September 2017. Retrieved 7 February 2018.
- ^ "How Fast Can the Ground Really Move?" (PDF). INSTITUTE FOR DEFENSE ANALYSES. Archived (PDF) from the original on June 1, 2022. Retrieved 2021-11-03.
- ^ Wen-Hsien Li; Chi-Hung Lee; Ma-Hsuan Ma; Ping Jung Huang; Sheng Yun Wu (2019). "Fault Dynamics of the 1999 Chi-Chi earthquake: clues from nanometric geochemical analysis of fault gouges". Scientific Reports. 9 (1): 5683. Bibcode:2019NatSR...9.5683L. doi:10.1038/s41598-019-42028-w. PMC 6451003. PMID 30952874.
Here, we report on the results of studies made on the fault dynamics of the 1999 Chi-Chi earthquake (Mw 7.6) through identifications of the changes in the grain-morphology and chemical composition resulting from fault movement.
- ^ Lin Chia-nan (28 March 2019). "Study on crustal changes after 921 quake unveiled". Taipei Times. Archived from the original on 3 September 2019. Retrieved 21 September 2019.
The team detailed their findings in a paper titled "Lower-crustal rheology and thermal gradient in the Taiwan orogenic belt illuminated by the 1999 Chi-Chi earthquake" which was published in the journal Science Advances.
- ^ "2000 Year In Review; 2002 Year in Review". 1999. pp. 52, 53, 92 – via Internet Archive.
Kao, H., and Chen, W.-P., 2000, The Chi-Chi earthquake sequence: Active out-of-sequeence thrust faulting in Taiwan: Science, 288: 2346-2349
- ^ 中央通訊社 (2023-09-21). "921國家防災日 氣象署發布地震及海嘯警報演練訊息 | 生活". 中央社 CNA (in Chinese). Retrieved 2024-07-20.
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