Geological Line Selection for the Qinghai-Tibet Railway Engineering by Jincheng Li Wenwu Chen & Zhengping Liu

Author:Jincheng Li, Wenwu Chen & Zhengping Liu
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

4.2.5 Other Seismic Tectonic Belts

The overall seismic tectonic belt of Hoh Xil runs NWW, controlled by the active faults of Hoh Xil. The main controlling earthquake of Hoh Xil seismic tectonic belt includes the active faults of Chumar River, Wudaoliang, northern Hoh Xil Mountains, and southern Hoh Xil Mountains. The seismic tectonic belt of Donggu–Luhuo–Kangding segment has obvious strong Xianshui River seismic belt. Strong earthquakes of Ms7.0–7.5 along the active faults of southern Hoh Xil Mountains in the Holocene, forming earthquake scarps of length >20 km and height 1.5 m. The scarps cross the Qinghai–Tibet Railway, and they cut modern turfs and sand layers of the Holocene, left-laterally dislocating modern gullies of 4–4.5 m (Fig. 4.14) along ancient earthquake ruptures west of the Qinghai–Tibet Railway. The development of earthquake ruptures and the pull-apart basins in the earthquake scarp of 5–10 m, the occurrence of the Holocene sandy tectonic wedge of earthquake ruptures in tension–torsional in the NE direction, in addition to the formation of perennial frost heave hugelboden in the axial direction of NE after the earthquake show that the strike-slip faults of Hoh Xil in the Holocene have strong tectonic activities.

Fig. 4.14Ancient earthquake ruins of seismic tectonic zones of Hoh Xil

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