The 1955 Yuzha earthquake (1955年鱼鲊地震) occurred on September 23, 1955, at 15:06 UTC (23:06 local time). The epicenter was located in the area around Lazha (拉鲊), Dalongtan (大龙潭) Township,

Renhe District Renhe District () is a district of the city of Panzhihua, Sichuan Province, China, bordering Yunnan Yunnan , () is a landlocked province in the southwest of the People's Republic of China. The province spans approximately and has a pop ...

Panzhihua Panzhihua (), formerly Dukou (), is a prefecture-level city located in the far south of Sichuan province, People's Republic of China, at the confluence of the Jinsha and Yalong Rivers. It has an administrative area of , and a population at the 2 ...

and Yuzha (鱼鲊) Township,

Huili County Huili (; Yi: or ''nyi ddix xiep'' or ''hop li xiep'') is a county-level city of far southern Sichuan province, China. It is under the administration of the Liangshan Yi Autonomous Prefecture. The county-level city was severely affected by ...

. Lazha then belonged to

Yongren County Yongren County (; Chuxiong Yi script: , IPA: ) is a county under the administration of the Chuxiong Yi Autonomous Prefecture, in the north of Yunnan province, China, bordering Sichuan province to the northeast. Administrative divisions Yongren Co ...

Yunnan Yunnan , () is a landlocked Provinces of China, province in Southwest China, the southwest of the People's Republic of China. The province spans approximately and has a population of 48.3 million (as of 2018). The capital of the province is ...

and now within

Sichuan Sichuan (; zh, c=, labels=no, ; zh, p=Sìchuān; alternatively romanized as Szechuan or Szechwan; formerly also referred to as "West China" or "Western China" by Protestant missions) is a province in Southwest China occupying most of the ...

. Yuzha then belonged to Huili County, Sichuan as it still does. The earthquake had a magnitude of 6.8. 728 people were reported dead and 1547 injured in the earthquake. More than 15000 rooms collapsed. Eight people died and seven houses collapsed in the Xigeda (昔格达) Village. Cracks ranging from 10 to 70 cm in width and 100 to 1,500 m in length occurred on hillsides and ridges. Landslides were observed along both banks of the

Jinsha River The Jinsha River (, Tibetan: Dri Chu, འབྲི་ཆུ) is the Chinese name for the upper stretches of the Yangtze River. It flows through the provinces of Qinghai, Sichuan, and Yunnan in western China. The river passes through Tiger L ...

. Many villages on both banks of the Jinsha River were destroyed. Rivers and springs dried up, and many new springs appeared. Changes of water level in wells and ditches were reported. Many villages on both banks of the Jinsha River were destroyed. Along the Jinsha River and its surrounding gullies, large quantities of rocks broke, fell, and dammed up the gullies. In the Jinsha River, waves surged 1 m high. The maximum intensity reached MM IX. The shaking could be felt as far as about 400 km away. The Xigeda-Yuanmou fault (昔格达—元谋断裂带), about 270 km long, is the seismogenic structure of this earthquake."昔格达断裂晚第四纪活动特征及强震复发周期" by 卢海峰 and 姬志杰 From the distribution of the isoseismals of this earthquake, it was suggested that there is a three-layered structure. There is a rupture layer, and there are two complete rock layers located in both sides of the rupture layer. The rupture layer is the place where the stress was concentrated and released and has the role of reflecting the seismic wave propagation."中国强震发生带地震构造的几点思考" by 李坪, 黄广思, and 杨美娥

References

External links

* Yuzha earthquake, 1955 Earthquakes in Sichuan Earthquakes in Yunnan {{China-stub

See also

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