2015年尼泊尔8.1级地震前后拉萨地电场观测数据变化分析*

Abstract

Abstract: The main purpose of this paper is to analyze the characteristics of the geo-electric field observations,with the long time span and the large amplitude abnormal changing,in the Lhasa geomagnetic station before and after the Nepal M8.1strong earthquake,occurred in April 25th,2015.The observation condition,the observation system,and the observation data of the Lhasa station have been preliminary discussed firstly,and then the main characteristics of the abnormal change and evolution process are analyzed and studied,using“the synthesis energy accumulative”and“the power as MSA spectrum analysis”methods,from two aspects of time domain and frequency domain.The results show that the abnormal changing of the geo-electric field observation of the Lhasa station experiences development stage of"trend change-disturbance change-earthquake period-recovery period",and evolution process of low frequency change-high frequency change-stationary change changehigh frequency change" ,before and after the Nepal M8.1strong earthquake.Comprehensive analysis shows that the characteristics and evolution process of the geo-electric field observations of the Lhasa station are basically consistent with the relevant mechanism.It is the valuable data,with certain objectivity,typical and representative,to reflect the whole process of the breeding,occurrence and development of such strong earthquake.

Key words: Geo-electric field changes, Synthesis energy accumulative, the Nepal M8.1 earthquake, Lhasa geomagnetic station

CLC Number:

P315.7

XI Ji-lou, GUAN Hua-ping, LIU Chao, ZHANG Nan, ZHANG Zhi-guo, CI Zhuo-ga, Kelsang Drolma, MA Ai-ming. Geo-electric Field Changes Observed at Lhasa Geomagnetic Station before and after the 2015Nepal M8.1Earthquake[J]. EARTHQUAKE, 2016, 36(2): 1-13.

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Geo-electric Field Changes Observed at Lhasa Geomagnetic Station before and after the 2015Nepal M8.1Earthquake

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