[1]MENG Lingyuan,ZHANG Zhuqi,ZHOU Longquan,et al.Research on Cumulative Coulomb Stress Evolution Characteristic of Strong Earthquakes along the Qilian-Haiyuan Fault Zone[J].Journal of Seismological Research,2016,39(04):553-565.
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Research on Cumulative Coulomb Stress Evolution Characteristic of Strong Earthquakes along the Qilian-Haiyuan Fault Zone
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
39
Number of periods:
2016 04
Page number:
553-565
Column:
Public date:
2016-10-30
- Title:
- Research on Cumulative Coulomb Stress Evolution Characteristic of Strong Earthquakes along the Qilian-Haiyuan Fault Zone
- Keywords:
- Qilian-Haiyuan Fault Zone; viscoelastic relaxation; Burgers model; cumulative coulomb stress evolution
- CLC:
- P315.727
- DOI:
- -
- Abstract:
- Firstly,we study the triggering relation of six strong MS≥7.0 earthquakes after Haiyuan MS8.5 earthquake in 1920 along the Qilian-Haiyuan Fault Zone and its adjacent area since 1920,such as the 1920 Haiyuan MS8.5 earthquake,the 1927 Gulang MS8.0 earthquake,the 1932 Changma MS7.6 earthquake,the 1954 MS7.3 Shandan earthquake,the 1954 Minqin MS7.0 earthquake,and the 1990 Gonghe MS7.0 earthquake.Secondly,we establish the viscoelastic medium model based on Burgers model to simulate the co-seismic and post-seismic cumulative coulomb stress changes.Finally,we calculated the stress accumulation in the last hundred years of 6 strong earthquakes on the north Qilian-Mountain Fault,the north Western-Qinling Fault and Liupan-Mountain Fault.The results shows that the 1927 Gulang MS8.0 earthquake was triggered by the loading of both co-seismic and post-seismic coulomb failure stresses of the 1920 Haiyuan MS8.5 earthquake,and the 1954 Minqin MS7.0 earthquake and the1990 Gonghe MS7.0 earthquake were both influenced by the loading of cumulative coulomb stress of their previous earthquakes.The north Western-Qinling Fault was located in the stress unloading zone cumulated by the total 6 strong earthquakes with the viscoelastic relaxation till 2015,and the Liupan-Mountain Fault located in the cumulative stress loading zone.It needs to point out that studying the coulomb stress changes of strong earthquakes and their cumulative effect on the surrounding fault zone in the long time scale,it need to consider the cumulative effect of post-seismic coulomb stress under the effect of viscoelastic relaxation and provide reference for determining the risk segment combining with seismic activity.
- References:
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- Similar References:
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Last Update:
2016-10-30