1983 Heze earthquake: Difference between revisions
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[[Category:1983 earthquakes]] |
[[Category:1983 earthquakes]] |
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[[Category:Earthquakes in China]] |
[[Category:Earthquakes in China]] |
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[[Category:Heze]] |
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[[Category:Geography of Shandong]] |
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[[Category:History of Shandong]] |
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{{Earthquakes in China}} |
{{Earthquakes in China}} |
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{{Earthquakes in 1983}} |
{{Earthquakes in 1983}} |
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Revision as of 05:09, 17 February 2022
   | |
| UTC time | 1983-11-06 21:09:45 |
|---|---|
| USGS-ANSS | ComCat |
| Local date | November 07, 1983 |
| Local time | 05:09:25 (UTC+8) |
| Magnitude | 5.7 mb 5.9 Ms |
| Depth | 19 km (12 mi) |
| Epicenter | 35°12′22″N 115°12′47″E / 35.206°N 115.213°E |
| Type | Strike-slip |
| Areas affected | People's Republic of China |
| Max. intensity | MMI VII (Very strong) |
| Casualties | 34 dead 2,200 injured |
The 1983 Heze earthquake occurred near the administrative borders between the provinces of Shandong and Henan in the People's Republic of China on November 7, 1983, 05:09 local time and date. The earthquake recorded a body wave magnitude of 5.7 and reaching a maximum intensity of VII (Very Strong) on the Modified Mercalli Intensity scale.[1][2] The strength of the event caused 34 individuals to lose their lives as well as injuring an estimated 2,200 people. Damage was also severe as more than 3,300 houses were destroyed due to the earthquake.[2]
Tectonic setting
The Shandong plain lies inside the much larger North China Plain, a seismically active alluvial plain riddled with faults and boundaries and home to most of China's most catastrophic earthquakes. In this case withing the eastern regions of Shandong and China lies the Tanlu fault one of the largest faults in all of Eastern China reaching as far as the Bohai Sea. The Tanlu fault, as well as the Yishu fault, were the cause of the Great 1668 Shandong earthquake with a moment magnitude of 8.5 and the 1937 Heze earthquakes respectively.[3][4]
Earthquake
The earthquake was said to be a result of a modal plane striking in a Northeastern direction in the plains of the Shandong province. The northeastern direction of the fracture has a velocity of 0.6 kilometers per second, the rupture of the said fault was measured at a length of 3 kilometers. From more calculations it was said that the magnitude of the earthquake was 5.9 on the surface-wave magnitude scale or 5.7 on the moment magnitude scale. The mezoseismal area near the epicenter recorded a maximum intensity VII most (Strong) according to the Modified mercalli scale, and it was said to be felt as far as the Hebei and Henan provinces nearby.[5][2]
Precursor anomalies
A month before the earthquake occurred, multiple anomalies and changes along the faultlines near the epicenter were observed. Some anamolies were said to be involved with liquids and hydrochemical elements on the most vulnerable faultlines along the northern plains of China. Certain spikes of these anomalies were worryingly frequent with sudden jumps of observations.[6] Another geological anomaly that was observed was a strange uplift occurring upon 20 km (12 mi) of the plane fault, specifically an maximum uplift of 2.8 mm which is slightly above the average uplift of 2 mm. It was later realized that the fault was experiencing multiple soft straints since a year before the earthquake occurred. The straints have also apparently cause minor shocks ever since the last earthquake in the area in 1937.[5]
Damage and casualties
Damage was observed along the counties of Heze and Dongming in Shandong totalling to 3,300 houses being destroyed as a result. A total of 34 people were confirmed to have lost their lives as caused by the earthquake and also injuring 2,200 people mostly due to falling debris and the said destroyed homes.[2]
See also
- 1937 Heze earthquakes
- Great 1668 Shandong earthquake
- List of earthquakes in China
- List of earthquakes in 1983
References
- ^ "M 5.7 - 24 km W of Heze, China". earthquake.usgs.gov. Retrieved 2022-02-09.
- ^ a b c d "NCEI Global Historical Hazard Database". www.ngdc.noaa.gov. Retrieved 2022-02-09.
- ^ Tao Jiang; Zhigang Peng; Weijun Wang; Qi-Fu Chen (2010). "Remotely Triggered Seismicity in Continental China following the 2008 Mw 7.9 Wenchuan Earthquake" (PDF). Bulletin of the Seismological Society of America. 100 (5B): 2574–2589. doi:10.1785/0120090286.
- ^ Lei, Jianshe; Zhao, Dapeng; Xu, Xiwei; Du, Mofei; Mi, Qi; Lu, Mingwen (2020-02-01). "P-wave upper-mantle tomography of the Tanlu fault zone in eastern China". Physics of the Earth and Planetary Interiors. 299: 106402. doi:10.1016/j.pepi.2019.106402. ISSN 0031-9201.
- ^ a b Wanqinup, Liu; Guangxingup, Wei; Cuiyingup, Zhou (August 1989). "A Study of the Focal Process of the Heze Earth-Quate (MS=5.9), Shandong Province of November 7, 1983". Acta Seismologica Sinica. 11: 9.
- ^ Jie, Geng; Zhaodong, Zhang (1998-06-15). "Discussion on the Distribution Characteristics of Subsurface Fluid Anomalies Before the Heze 1983 M5.9 Earthquake and the Relative Issues Concerned". 华北地震科学 (in Chinese). 16 (2): 15–22. ISSN 1003-1375.