昆仑山口西8.1级地震前电离层与磁场短期异常对比研究  

Comparison study on short-term anomalies of ionosphere and geomagnetic field before Kunlunshan M_S 8.1 earthquake

作　　者：丁鉴海[1] 索玉成[2] 余素荣[1] 肖武军[1] 

机构地区：[1]中国地震局分析预报中心,北京100036 [2]中国电波传播研究所,北京102206

出　　处：《地震》2004年第1期104-111,共8页Earthquake

基　　金：十五"国家科技攻关项目(2001BA601B01 05 04

摘　　要：利用中国电离层台站和地磁台网资料,总结了8.1级地震前出现的电离层f0F2(F2层临界频率)异常以及地磁低点位移、地磁日变化异常现象。对比研究了电离层与磁场短期异常分布及特征,结果显示:磁场与电离层时空异常特征有较好的一致性。2001年10月8日出现低点位移,其突变分界线通过震中地区;震前1.5个月之内震中及周围地区出现地磁日变化异常,拉萨台电离层f0F2出现明显异常。On the basis of data observed by the ionospheric observatories and geomagnetic network in China, the ionospheric f_oF_2 (critical frequency of F_2-layer) anomaly phenomena, geomagnetic low-point displacement and diurnal-variation anomalies of geomagnetic field before Kunlunshan M_S8.1 earthquake have been summarized. Anomaly distribution and characteristics of ionospheric f_oF_2 and geomagnetic variation field have been comparatively studied. The result shows that the temporal-spatial characteristics of short-imminent anomalies of ionosphere and geomagnetic field are consistent. The geomagnetic low-point displacement appeared on Oct. 8, 2001, the boundary of sudden change passed through the epicentral area. The obvious anomalies of diurnal-variation of geomagnetic field near epicentral area and ionospheric f_oF_2 at Lasa observation station are found within one month and half before Kunlunshan earthquake.

关 键 词：电离层 磁场 短期异常 地磁日变化 地磁低点位移 

分 类 号：P315.72[天文地球—地震学]