[1]DU Jiliang,WU Yanqiang,ZOU Zhenyu.Comparison of Deformation Field Pertaining to Lushan MS7.0 Earthquake and Northridge MW6.7 Earthquake[J].Journal of Seismological Research,2016,39(03):404-409.
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Comparison of Deformation Field Pertaining to Lushan MS7.0 Earthquake and Northridge MW6.7 Earthquake
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
39
Number of periods:
2016 03
Page number:
404-409
Column:
Public date:
2016-07-23
- Title:
- Comparison of Deformation Field Pertaining to Lushan MS7.0 Earthquake and Northridge MW6.7 Earthquake
- Keywords:
- Lushan MS7.0 earthquake; Northridge MW6.7 earthquake; pre-seismic deformation background; GPS co-seismic displacement
- CLC:
- P315.725
- DOI:
- -
- Abstract:
- The near field co-seismic displacement distributions pertaining to the 2013 Lushan MS7.0 earthquake and the 1994 Northridge MW6.7 earthquake showed the specific characteristics with fracture not reaching the crustal surface.We compared and analyzed the relationship between the pre-seismic deformation and the co-seismic deformation of these two earthquakes using GPS data from 1999 to 2007.The analysis results of Lushan MS7.0 earthquake showed that there exited the obvious compressive strain accumulation(the azimuth is about 284°)in the focal area,however,the shear deformation along the rupture section was not obvious.The co-seismic deformations showed the characteristics of levorotation and extrusion,which reflected the strain accumulation characteristics in the whole seismogenic period and may indicate that the observation about 10 years before the earthquake cannot represented the characteristics in the whole seismogenic period.Before the Northridge earthquake,the characteristic of dextrorotation and extrusion of surface deformation was in dominant near the focal region.The co-seismic deformation of the earthquake mainly showed thrust rupture,and the horizontal movement in east and west directions and uplift movement were significant in near field which liked “dome” shape.As a result,the characteristic between pre-seismic and co-seismic deformations showed difference to a certain degree.In conclusion,the magnitude of the co-seismic deformation of the Northridge MW6.7 earthquake was greater than that of the Lushan MS7.0 earthquake reflected by the results of the stations with the same epicenter distance,and the pre-seismic extrustion strain accumulation rate of the Northridge earthquake was faster than that of the Lushan earthquake during 1999 and 2007.
- References:
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Last Update:
1900-01-01