CURRENT FAULT MOVEMENT CHARACTERISTICS IN HUOERGUOSI-MANASI-TUGULU FAULT ZONE
Huoerguosi-Manas-Tugulu fault plays an important role in the Cenozoic tectonic evolution of Tianshan Mountains,and controls the seismic activity in the piedmont area of the northern Tians-han Mountains.It is of great significance to understand the activity characteristics of different sec-tions of Huoerguosi-Manas-Tugulu fault zone for the movement characteristics of the piedmont de-pression of Urumqi.GPS stations in the study area are used to obtain the current GPS velocity field,baseline length change,strain and other results in the region.Then,the profile projection method of GPS velocity field is used to analyze the cross-fault leveling data.The results show that the Tianshan Mountains are in a squeezed state through the change trend of the baseline of the terrestrial network station.The baseline variation of the geodetic quadrilateral network shows that the Dafeng survey ar-ea of the Tugulu anticline is in a state of extrusion from 2017 to 2021,and there is a trend of tension from 2021 to 2023,which is consistent with the trend of the cross-fault leveling results of the site.The fault in the Hongshanzui survey area has always been in a squeezed state,which is the same as the measurement results of the regional cross-fault leveling site.The GPS velocity profile of the cross-Horgos-Manas-Tugulu fault shows that the north-south velocity of the GPS station decreases from west to east,and the slip rate of Horgos-Manas-Tugulu fault is about 1 mm/a.These faults are thrust characteristics,and the strike-slip component has no obvious change.
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