- Source: 1920 Haiyuan earthquake
The 1920 Haiyuan earthquake (Chinese: 海原大地震; pinyin: Hǎiyuán dà dìzhèn) occurred on December 16 in Haiyuan County, Ningxia Province, Republic of China at 19:05:53. It was also called the 1920 Gansu earthquake because Ningxia was a part of Gansu Province when the earthquake occurred. It caused destruction in the Lijunbu-Haiyuan-Ganyanchi area and was assigned the maximum intensity on the Mercalli intensity scale (XII Extreme). About 258,707-273,407 died, making it one of the deadliest earthquakes in China and disasters in China by death toll.
Tectonic setting
Major left-lateral strike-slip structures occur in the Tibetan Plateau as a result of the India–Asia collision. These faults, including the Altyn Tagh, Haiyuan, Kunlun, Karakoram and Xianshuihe faults, accommodate crustal deformation within the Tibetan Plateau. One of these fault systems, the Haiyuan Fault, runs 1,000 km (620 mi) along the plateau's northeastern edge.
Earthquake
The earthquake hit at 19:05:53 Gansu-Sichuan time (12:05:53 UTC), reportedly 8.25 Mw or 7.8 ML, and was followed by a series of aftershocks for three years. The often cited magnitude in scientific literature is M 8.5 which has been regarded as an overestimate due to the limited technological advancements and instrumentation during the period which the earthquake occurred. On the moment magnitude scale which measures an earthquake with respect to its physical parameters, it is estimated at Mw 7.9. The International Seismological Centre also catalogs the earthquake at Mw 7.9.
About 230 km (140 mi) of surface faulting was seen from Lijunbu through Ganyanchi to Jingtai. There were over 50,000 landslides in the epicentral area and ground cracking was widespread. Some rivers were dammed; others changed course. Seiches from this earthquake were observed in two lakes and three fjords in western Norway.
Field observations in the 1980s found 237 km (147 mi) of surface rupture along the Haiyuan Fault with a maximum horizontal offset of 6.5 m (21 ft) in the middle section of the rupture zone. The earthquake ruptured the section of the Haiyuan Fault between the Laohushan segment in the west and Liupanshan Thrust Fault to the east. The earthquake's epicenter is also likely near Haiyuan which is supported by the seismic intensity distribution.
Damage and aftermath
Over 73,000 people were killed in Haiyuan County. A landslide buried the village of Sujiahe in Xiji County. More than 30,000 people were killed in Guyuan County. Nearly all the houses collapsed in the cities of Longde and Huining. Damage (VI–X) occurred in seven provinces and regions, including the major cities of Lanzhou, Taiyuan, Xi'an, Xining and Yinchuan. It was felt from the Yellow Sea to Qinghai (Tsinghai) Province and from Nei Mongol (Inner Mongolia) south to central Sichuan Province.
Since 2003, Chinese seismologists have calculated 258,707~273,407 to be the empirical verifiable range of death toll. Older sources put the deaths to be 234,117 or 235,502. Either way, it is one of the most fatal earthquakes in China, in turn making it one of the worst disasters in China by death toll.
Many more perished because of cold: frequent aftershocks caused the survivors to fear building anything other than temporary shelters, and a severe winter killed many who had lived through the original earthquake.
The Sufi Jahriyya Muslim Hui leader Ma Yuanzhang and his son died in the earthquake when the roof of the Mosque they were in collapsed in Zhangjiachuan. The Muslim General Ma Fuxiang was involved in relief efforts in Lanzhou during the earthquake.
See also
List of disasters in China by death toll
List of earthquakes in China
List of earthquakes in 1920
References
Further reading
Xu, Xiurong; Zhang, Zhenguo; Hu, Feng; Chen, Xiaofei (2019), "Dynamic Rupture Simulations of the 1920 Ms 8.5 Haiyuan Earthquake in China", Bulletin of the Seismological Society of America, 109 (5): 2009–2020, Bibcode:2019BuSSA.109.2009X, doi:10.1785/0120190061, S2CID 203134903
External links
The International Seismological Centre has a bibliography and/or authoritative data for this event.
This article incorporates public domain material from websites or documents of the United States Geological Survey.
Kata Kunci Pencarian:
- Gempa bumi Gansu 1920
- 1920 Haiyuan earthquake
- 1920s
- Lists of earthquakes
- Gansu earthquake
- List of natural disasters by death toll
- List of earthquakes in China
- Yaodong
- 1976 Tangshan earthquake
- List of disasters in China by death toll
- Haiyuan Fault
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