利用垂直强度极化法分析喀什观测站地磁秒数据异常  

APPLICATION OF GEOMAGNETIC VERTICAL INTENSITY POLARIZATION METHOD IN ANALYZING ANOMALY INFORMATION OF GEOMAGNETIC SECOND DATA ON KASHI STATION

作　　者：木拉提江·阿不来提 高歌[1] Mulatijiang Abulaiti;Gao Ge(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011

出　　处：《内陆地震》2023年第2期180-188,共9页Inland Earthquake

基　　金：新疆地震科学基金(202216);中国地震局监测、预报、科研三结合课题(3JH-202301001).

摘　　要：利用极化法计算喀什观测站FHDZ-M15地磁秒数据垂直分量极化值,定量研究极化值异常幅值、震中距、异常持续时间及对应地震震级之间的关系。结果表明:①极化值高值异常与其后4个月内台站周边区域的M_(S)≥5.0地震有很好的对应关系,高值异常持续多为3~6 d;②对应地震的震级与震中距之间为准线性关系,相关系数达0.791;③按震中距分析得出具有显著关系有[0,150)km和[150,250)km,异常持续时间和对应地震震级相关系数分别为0.645、0.702。[150,250)km内,异常幅值与震级相关系数为0.717。[250,∞]km,震中距与震级相关系数达0.687;④按震级分析,M_(S)[6.0,7.0),震级与震中距呈中度负相关,相关系数为-0.685。Polarization value of the vertical component of FHDZ-M15 geomagnetic second data at Kashi Station is calculated by the polarization method,and the relationship between the abnormal amplitude of the polarization value,Epicentral distance,abnormal duration and the corresponding earthquake magnitude is quantitatively studied.The results show that:①there is a good correspondence between the high polarization value anomaly and M_(S)≥5.0 earthquakes in the surrounding area of the station within the next 4 months,with high value anomalies lasting mostly for 3~6 days;②The relationship between the magnitude of the corresponding earthquake and the Epicentral distance is quasi linear,and the correlation coefficient reaches 0.791;③According to the analysis of Epicentral distance,the significant relationships are 0~150 km and 150~250 km,and the correlation coefficients of anomaly duration and corresponding earthquake magnitude are 0.645 and 0.702 respectively.The correlation coefficient between anomaly amplitude and magnitude is 0.717 within 150~250 km.Over 250 km,the correlation coefficient between Epicentral distance and magnitude is 0.687;④According to the magnitude analysis,M S6.0~6.9,the magnitude is moderately negatively correlated with Epicentral distance,and the correlation coefficient is-0.685.

关 键 词：极化法 异常提取 地磁 相关系数 

分 类 号：P315.7[天文地球—地震学]