[1]CHANG Yuqiao,CHEN Lichun,LI Xi,et al.The Late Quaternary Activity of the Fault along the Western Margin of the Yiliang Basin of the Xiaojiang Fault Zone[J].Journal of Seismological Research,2021,44(02):152-161.
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The Late Quaternary Activity of the Fault along the Western Margin of the Yiliang Basin of the Xiaojiang Fault Zone
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
44
Number of periods:
2021 02
Page number:
152-161
Column:
Public date:
2021-06-30
- Title:
- The Late Quaternary Activity of the Fault along the Western Margin of the Yiliang Basin of the Xiaojiang Fault Zone
- CLC:
- P315.21
- DOI:
- -
- Abstract:
- The Xiaojiang Fault Zone forms the southeastern boundary of the Sichuan-Yunnan Block.As one of the most seismically active zones in Yunnan Province,many historical strong earthquakes(M>7),such as the 1833 M8 Songming earthquake,occurred in it.Along the western margin of the Yiliang Basin and in the eastern branch of the Xiaojiang Fault Zone,there is a secondary fault zone which is composed of the Xiaoxinjie-Yiliang Fault,the Yiliang-Xujiadu Fault,and the Majie-Nanyangjie Fault.The M>7 Yiliang earthquake in 1500 had produced a long surface rupture distributing discontinuously along the western margin of the Yiliang Basin.The remote sensing image shows that the secondary fault zone has a remarkable linear feature.There are a lot of dislocation landforms such as fault trough and fault scarps along its strike.Based on interpretation of high-resolution remote sensing images,and through detailed geological and geomorphological investigation,we obtained geological evidences of the late Quaternary activity of the secondary fault.The trench in Dianfang village revealed that the secondary fault had dislocated the Holocene stratum and behaved as a normal fault.Two trenches in Dagua village reveal that the 2460 a BP strata had been dislocated by the fault along the western margin of the Yiliang Basin.We analyzed dislocation landform and the historical recordings,and found that the Yiliang earthquake in 1500 may be the latest event.
- References:
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Last Update:
2021-06-30