[1]YANG Zhigao,ZHANG Xuemei.Study on Crustal Thickness and Velocity Ratio near Menyuan MS6.4 Earthquake Zone[J].Journal of Seismological Research,2016,39(04):566-573.
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Study on Crustal Thickness and Velocity Ratio near Menyuan MS6.4 Earthquake Zone
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
39
Number of periods:
2016 04
Page number:
566-573
Column:
Public date:
2016-10-30
- Title:
- Study on Crustal Thickness and Velocity Ratio near Menyuan MS6.4 Earthquake Zone
- CLC:
- T315.3
- DOI:
- -
- Abstract:
- Using the collected earthquake waveform data of Menyuan MS6.4 earthquake recorded by 63 3-compoents earthquake stations in regional seismic network in 2015,we calculated regional crustal thickness and velocity ratio by H-k scan method.The distribution of crustal thickness clearly showed a increasing trend from east to west with two remarkable crustal thickness gradient band zone.The average crustal thickness is 50.8 km,which is significantly thicker than average thickness of continental crust and the average Poisson's ratio is 0.25,which is a little lower than continental average value 0.265.We analyzed the studying results and found that the crust thickening in the middle east of the study area mainly occurred in the upper crust,the increase of the content of the felsic rock resulting in the low Poisson's ratio.The super high Poisson's ratio appears in some areas,we deduce that there exit the partial melting.The Gulang earthquake,Haiyuan earthquake and Menyuan earthquake all occurred near the gradient zones of Poisson's ratio and crustal thickness,and the side of low Poisson's ratio.
- References:
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Last Update:
2016-10-30