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Analyze the correlation between the geomorphic indices and recent tectonic active of the Lo River fault zone in southwest of Tam Dao range

Ngo Van Liem, Phan Trong Trinh, Hoang Quang Vinh, Nguyen Van Huong, Nguyen Cong Quan, Tran Van Phong, Nguyen Phuc Dat

Abstract


The Lo River Fault Zone in southwest of Tam Dao mountain range is believed to be manifestations of an active normal fault. We evaluated the relative active tectonics using three geomorphic indices: hypsometric curves (HC) or hypsometric integral (HI), mountain front sinuosity (Smf) and stream-length gradient (SL). SL index represents the value in the range of 4 to 1325 (gradient - meter). The higher the value SL focuses primarily on central segment. Smf index have values from 1.10 to 8.07, depending on the calculated basin and can be divided into 3 segments: north, center and south with corresponding average values of 5.57, 1.82 and 5.15, respectively. The HI indices of 28 key basins ranging from 0.039 to 0.398 and the dominantly concave hypsometric curves show a weak activity of recent tectonics, especially the vertical slips. The Lo River Fault in this area can be divided into 3 segments: north and south segments show almost inactive, central segment have expressed of recent active tectonic but also not really clear.

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DOI: https://doi.org/10.15625/0866-7187/38/1/7847 Display counter: Abstract : 172 views. PDF : 67 views.

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