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EARTHQUAKE ›› 2016, Vol. 36 ›› Issue (3): 87-98.

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Interpretation of High-resolution Remote Sensing Image of Offset Landform in Dezhou Segment of the Riyueshan Fault, Qinghai Province

HUANG Shuai-tang1, TIAN Qin-jian1, LI Zhi-min2, LI Wen-qiao1, FU Guo-chao1, YIN Xiang2   

  1. 1. Institute of Earthquake Science CEA, Beijing 100036, China;
    2. Qinghai Earthquake Administration, Qianghai Xining 810001, China
  • Received:2016-02-01 Published:2020-07-03

Abstract: The Riyueshan fault zone which locates in the northeastern margin of the Qaidam—Qilian active block is an NNW trending inverse dextral strike-slip fault. Using ENVI 5.1 image processing platform, we have fused the thigh GF-1 spectrum (resolution 8 m) and panchromatic (resolution 2 m) image for a high-fidelity, high-resolution satellite remote sensing image of the study area. Through interpretation and comparison with the multi-scale, multi-angle, multi-level structure, we divide Haiyan segment fracture (F1-3, F1-4) in west branch of Riyueshan fault zone into two sub-segments including Dezhou segment (F1-3) and Haiyan segment (F1-4), while we use the high-resolution Google-Earth images of each fault segment faulted micro-geomorphology translation to interpret and analyze. Based on geological surveying and field researching in Dezhou segment, we found that image interpretation is consistent with the field results . According to the remote sensing image, Dezhou section can be divided into five subparagraph (f1, f2 , f3, f4, f5), and then according to the dislocation landform, the activity of Dezhou segment have become stronger since late Pleistocene, and strike-slip component is greater than the dip-slip component, for the reverse dip-slip fault properties. Fault occurred multi-phase fault activity events since the late Pleistocene and the Holocene Active fault can be divided into two stages, the latest issue of horizontal displacement for 6.5~8.7 m, the second phase of the horizontal dislocation is 12.3~14 m; and the late Pleistocene can be divided into two sessions, the first phase of the horizontal displacement for 16~20 m, the second phase of the horizontal displacement for 28.5~47 m.

Key words: Riyueshan fault, Remote Sensing images, Geometric segmentation, Tectonic geomorphology, Active fault

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