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EARTHQUAKE ›› 2025, Vol. 45 ›› Issue (1): 147-160.doi: 10.12196/j.issn.1000-3274.2025.01.010

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Application of High-Resolution Stereo Image Extraction DEM in Estimating the Sliding Rate of Faults in Small Pull Apart Basins

LIN Jing-dong, XIONG Ren-wei, YANG Pan-xin   

  1. Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China
  • Received:2024-03-25 Accepted:2024-05-31 Published:2025-04-15

Abstract: The pull-apart basin is an important derived structure in strike-slip faults, and its formation is closely related to fault activity. In this paper, a small pull-apart basin, which developed in the western section of the Altyn Tagh fault near the macro epicenter of the 1924 Minfeng MS7.3 double earthquakes, was taken as the research object. Based on the high-resolution digital elevation model obtained from the GF-7 satellite stereo image pair and the principle of sediment volume conservation, the volume change during the formation process of the pull apart basin was systematically obtained, and the pull value of the basin was calculated to be 391 m. Near-surface Optically Stimulated Luminescence (OSL) samples of the diluvial platform, where the basin locates, are collected and measured, and the result shows that the basin formation age is (14.53±0.6) ka, so the fault slip rate of this section is 12.9~14.0 mm/a. The normal fault profile is discovered in the pull-apart basin. Combined the study of stratigraphic sedimentary sequences and the OSL results, it reveales at least two seismic displacement events since 7.15 ka, and the last one is likely related to the 1924 Minfeng double earthquakes.

Key words: Pull-apart basin, Altyn Tagh fault, Digital elevation model, Fault slip rate, The Qinghai-Xizang Plateau

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