[1]ZHANG Yong,HONG Min,GUO Huiwen,et al.Analysis of Near Field Activities of the Major Active Faults at the West Side of the Sichuan-Yunnan Rhombic Block Based on Cross-faults Deformation Data[J].Journal of Seismological Research,2019,42(01):57-63.
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Analysis of Near Field Activities of the Major Active Faults at the West Side of the Sichuan-Yunnan Rhombic Block Based on Cross-faults Deformation Data
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
42
Number of periods:
2019 01
Page number:
57-63
Column:
Public date:
2019-04-20
- Title:
- Analysis of Near Field Activities of the Major Active Faults at the West Side of the Sichuan-Yunnan Rhombic Block Based on Cross-faults Deformation Data
- Keywords:
- main active faults; least square method; near-field activity; strain analysis; Sichuan-Yunnan rhombic block
- CLC:
- P315.725
- DOI:
- -
- Abstract:
- Making use of observation data of cross-fault near-field deformation monitoring from 2010 to 2017 at the west side of Sichuan-Yunnan rhombic block,we use the least square method to solve and analyze the near field parameters such as the maximum shear strain and the shear strain rate,the surface strain and the surface strain rate.The results show that:① Shearing activity of the northern section of the Chenghai fault is stronger than that of the southern section,and tension-squeezing activity has a segmental characteristics before and after 2013.The north section of the Chenghai fault changes from compressive activity to tensional activity,and the southern segment changed from weak activity to compressive activity.② The shearing activity of the Honghe fault is the strongest in the middle part,with the northern part weaker,and the southern part is the weakest.The surface strain results show that the northern and middle segments is compressive for a long time,while the current tension-squeezing of southern segment is not obvious.③ The active characteristics of the Qujiang fault appears weak shear and cumulative accumulation pressure.④ The active characteristics shows weak shear and pressure in the Shiping-Jianshui fault.In summary,it is considered that the fault activity is characterized by the existence of strain accumulation in the faults with enhanced pressure and strong shear activity and weak shear activity under long-term compressive state.Therefore,the seismic hazard is worthy of attention in faults of the southern section of the Chenghai fault,the northern section of the Honghe fault,the Qujiang fault and Shiping-Jianshui.
- References:
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Last Update:
2019-04-25