1983 Heze earthquake

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1983 Heze earthquake
China Shandong rel location map.svg
Bullseye1.png
China edcp relief location map.jpg
Bullseye1.png
UTC  time1983-11-06 21:09:45
ISC  event 564438
USGS-ANSS ComCat
Local dateNovember 07, 1983
Local time05:09:25 (UTC+8)
Magnitude5.7 mb
5.9 Ms
Depth19 km (12 mi)
Epicenter 35°12′22″N115°12′47″E / 35.206°N 115.213°E / 35.206; 115.213
Type Strike-slip
Areas affected China
Max. intensity MMI VII (Very strong)
Casualties34 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, at 05:09 local time and date. The earthquake had a body-wave magnitude of 5.7 and a maximum intensity of VII (Very strong) on the Modified Mercalli intensity scale. [1] [2] The event caused 34 deaths and injured 2,200 people. More than 3,300 houses were destroyed. [2]

Contents

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, within 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 and the Yishu fault were the cause of the 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 (Very 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 faults near the epicenter were observed. Some anomalies were said to have involved with liquids and hydrochemical elements on the most vulnerable faults in the northern plains of China. Certain spikes of these anomalies were frequent with sudden jumps of observations. [6] Another geological anomaly that was observed was uplift occurring upon 20 km (12 mi) of the plane fault, specifically a maximum uplift of 2.8 mm; slightly above the average uplift of 2 mm. It was later realized that the fault was experiencing multiple soft strains for one year before the mainshock. The straints have also caused minor shocks since the last earthquake in the area in 1937. [5]

Damage and casualties

Damage was observed in the counties of Heze and Dongming in Shandong; 3,300 houses were destroyed. A total of 34 people were confirmed dead and 2,200 people were injured, mainly due to falling debris. [2]

See also

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References

  1. ↑ "M 5.7 - 24 km W of Heze, China". earthquake.usgs.gov. Retrieved 2022-02-09.
  2. 1 2 3 4 "NCEI Global Historical Hazard Database". www.ngdc.noaa.gov. Retrieved 2022-02-09.
  3. ↑ 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. Bibcode:2010BuSSA.100.2574J. doi:10.1785/0120090286.
  4. ↑ 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. Bibcode:2020PEPI..29906402L. doi: 10.1016/j.pepi.2019.106402 . ISSN   0031-9201. S2CID   210637062.
  5. 1 2 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.
  6. ↑ 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.
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