Paleoearthquake Investigation along the Chenghai Fault Zone since ∼500 ka, Southeast Margin of the Tibetan Plateau

The Tibetan Plateau is an active seismic region due to the collision between Indian and Eurasian plates. We have set up a new seismic network in the heart of the Tibetan Plateau, in the Lhasa region, to detect seismic activities. The measured data show that Lhasa is a seismically active region where at least 716 earthquakes were detected and a total of 218 events of magnitude greater than 2.0 occurred in the period between January 2004 and July 2006. Out of them, 11 earthquakes had a magnitude greater than 5.0. A high seismic activity was observed along the Dangshung fault zone.

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Correction to “Geology of the Haiyuan Fault Zone, Ningxia-Hui Autonomous Region, China, and its relation to the evolution of the northeastern margin of the Tibetan Plateau”

Tectonics ◽

10.1029/92tc00001 ◽

1992 ◽

Vol 11 (1) ◽

pp. 175-175

Author(s):

B. C. Burchfiel

Keyword(s):

Tibetan Plateau ◽

Fault Zone ◽

The Tibetan Plateau ◽

Autonomous Region ◽

Ningxia Hui Autonomous Region

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Huge Landslides along the Jinsha River in Southeastern Tibetan Plateau and Their Association with the Recent Activity of Jinsha River Fault Zone

10.5194/egusphere-egu2020-2815 ◽

2020 ◽

Author(s):

Zufeng Chang ◽

Hao Chang ◽

Zebin Mao ◽

Ruojin Guo

Keyword(s):

Tibetan Plateau ◽

Fault Zone ◽

Large Scale ◽

Late Quaternary ◽

Average Rate ◽

Economic Losses ◽

The Tibetan Plateau ◽

Jinsha River ◽

Water Storage Capacity ◽

Barrier Lake

&#160;&#160;&#160;&#160; The Jinsha river fault zone in the eastern margin of the Tibetan Plateau is an old suture structure after the shutting of the proto-Tethys and a large scale ultra-lithosphere fault zone consisted of&#160; 5 to 6 fault branches with a width of 50km, have a long&#160;&#160;geological evolution history. Since late Quatery, this fault zone is mainly dominated by dextral strike slip with partial thrusting component, absorbing &#160;partial energy of the extrusion movement of&#160;&#160;Tibetan Plateau. Along the fault zone, lower terraces of Jinsha river at Muronglou, Buzhong, Langzhong, Guxue, etc. were displaced, indicating the fault zone is active in late Quaternary, with an average rate of 3.5&#65374;4.3mm/ /yr. horizontally and 0.9-1.1mm/yr. vertically respectively in Holocene. Influenced by the intense fault activity of Jinsha river fault zone, this region is characterized by fractured rocks, strongly weathered surfaces.&#160;&#160;&#160;&#160;&#160; The Jinsha river, the upstream of the Yangtze river, parallel to Jinshajiang fault zone, flows from north to south, forming deep river valley and huge terrain elevation difference. Numerous huge landslides have developed along the river, for example, there are 23 giant avalanches in the 38 km long reach from Narong to Rongxue, with general volumes of 10~70 million m3 and even up to several hundreds million m3. Moreover, the landslides produce many loose clastic fragments which detonate many debris flows and river blocking. The latest disaster event is the Baige barrier lake in 2018 caused by landslide, with a water storage capacity of 524 million m3, causing tens of billions of yuan of economic losses. These landslides are distributed along the fault and its two sides, suggesting that these huge avalanches are closely related to the intense activity of the fault zone and special topography.Keywords: Huge landslide, Jinsha River, Jinsha River Fault Zone, late Quatery activity

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