[1]QIN Jia-zheng,LIU Li-fang,QIAN Xiao-dong.Analysis of Rupture Characteristics of the MS8.0 Wenchuan Earthquake Based on Seismic Scaling Law[J].Journal of Seismological Research,2008,31(增刊):458-463.
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Analysis of Rupture Characteristics of the MS8.0 Wenchuan Earthquake Based on Seismic Scaling Law
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
31
Number of periods:
2008 05
Page number:
458-463
Column:
Public date:
2008-11-23
- Title:
- Analysis of Rupture Characteristics of the MS8.0 Wenchuan Earthquake Based on Seismic Scaling Law
- Keywords:
- seismic scaling law; rupture process; source parameter; Wenchuan M≥6 aftershocks is about 10 MPa; about one half of the mainshock; the stress drops have no apparent changes; and the average is about 7.0 MPa.Combined with the distribution of aftershocks; the
- CLC:
- P315.75
- DOI:
- -
- Abstract:
- Based on seismic scaling law from two-dimensional faulting model,we estimate the fault rupture parameters of the MS8.0 Wenchuan earthquake.The length of fault is 18 km,the width 29 km,the area 6 310 km2,the maximum offset 5.01 m,the rupturing velocity 2.8 km/s,the duration of rupture process 78 s,the seismic moment 7.94×1020 N·m,the moment magnitude 7.9,which are basically consistent with the results of related studies.We also calculate the focal stress parameters of the mainshock and three strong aftershocks with M≥6.The stress drop of main shock is 6.34 MPa,the apparent stress 0.60 MPa,the shear stress 22.13 MPa,which shows the high tectonic ambient shear stress for the main shock.The average shear stress of the M≥6 aftershocks is about 10 MPa,about one half of the mainshock; the stress drops have no apparent changes,and the average is about 7.0 MPa.Combined with the distribution of aftershocks,the fault plane of the main shock is unilateral rupture and rupture trend is in NE.The main release region of seismic energy is about 200 km from the initial fault rupture.Because the mainshock is shallow and large and the seismic source near the surface,the enormous seismic energy released by the mainshock during the rupture process cause the destruction with Ⅺ degree intensity in the seismic area. Key words:seismic scaling law; rupture process; source parameter; Wenchuan M≥6 aftershocks is about 10 MPa,about one half of the mainshock; the stress drops have no apparent changes,and the average is about 7.0 MPa.Combined with the distribution of aftershocks,the fault plane of the main shock is unilateral rupture and rupture trend is in NE.The main release region of seismic energy is about 200 km from the initial fault rupture.Because the mainshock is shallow and large and the seismic source near the surface,the enormous seismic energy released by the mainshock during the rupture process cause the destruction with Ⅺ degree intensity in the seismic area.
- References:
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Last Update:
2008-12-30