地震研究

腾冲地电场震前的前兆异常分析^*

(1.云南省地震局弥渡地震台,云南弥渡 675600; 2.云南省弥渡县地震局,云南弥渡 675600; 3.云南省地震局腾冲地震台,云南腾冲 679100)

Analyses of Precursory Anomaly before Earthquakes in Tengchong Geoelectric Field

CHU Jin-xue¹,FANG Wei¹,YANG Xiao-ying²,ZHANG Yan-qin²,LIU Ying-ping²,DUAN Yi³

(1. Midu Seismic Station,Earthquake Administration of Yunnan Province,Midu 675600,Yunnan,China)(2. Earthquake Administration of Midu County,Midu 675600,Yunnan,China)(3. Tengchong Seismic Station,Earthquake Administration of Yunnan Province,Tengchong 67910

Keywords：multi-pole-pitch observations in the geo-electrical field; precursory anomaly; geoelectric field in Tengchong

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参考文献

采用2008年以来腾冲地电场NS、EW测向长、短极距原始观测资料,使用相同测向的长、短极距观测值所得的差值,对腾冲地电场原始观测资料进行震前异常分析研究。研究结果显示:云南多次中强地震发生前,从地电场原始观测资料中基本无法识别出震前异常信息,但在地电场观测资料的差值曲线上前兆异常信息表现较明显。

Using the original observation data of long and short pole pitches in NS and EW direction in Tengchong geoelectric field since 2008,we adopted the new method that using the observation value difference between the long and short pole pitches to analyze and study the precursory anomaly before earthquakes in Tengchong geoelectric field. The research results show that it cannot identify the anomaly from the original geoelectric field observation data,however,the anomaly is obvious in the difference curve of geoelectric observation data before several mid-strong earthquakes in Yunnan since 2008.

引言
1 腾冲地电场观测基本情况
2 观测数据处理分析
3 震前异常特征
4 讨论与结论

图1 布极示意图<br/>Fig.1 The shetch map of the layout polar

图1 布极示意图
Fig.1 The shetch map of the layout polar

图2 地电场多极距观测系统图(据马钦忠等(2004))<br/>Fig.2 The multi-pole pitch observation system of geoelectric field(MA et al.(2004))

图2 地电场多极距观测系统图(据马钦忠等(2004))
Fig.2 The multi-pole pitch observation system of geoelectric field(MA et al.(2004))

表1 2008～2012年云南M≥5.0地震及腾冲地电场震前异常统计<br/>Tab.1 Statistics on MS≥5.0 earthquakes in Yunnan and geoelectric field anomaly before the earthquakes in Tengchong from 2008 to 2012

表1 2008～2012年云南M≥5.0地震及腾冲地电场震前异常统计
Tab.1 Statistics on MS≥5.0 earthquakes in Yunnan and geoelectric field anomaly before the earthquakes in Tengchong from 2008 to 2012

图3 2008年中缅交界M5.3、盈江M5.8地震前腾冲电场异常变化曲线<br/>(a)NS测向长、短极距原始观测值;(b)NS测向长、短极距差值; <br/>(c)EW测向长、短极距原始观测值;(d)EW测向长、短极距差值<br/>Fig.3 The anomaly curve of Tengchong geo-electric field before Sino Burmese border M5.3,Yingjiang M5.8 earthquakes in 2008 (a)the original observation data of long and short pole pitchs in NS direction;(b)the difference between long and short pole pitchs in NS direction;(c)the original observation data of long and short pole pitchs in EW direction;(d)the difference between long and short pole pitchs in EW direction

图3 2008年中缅交界M5.3、盈江M5.8地震前腾冲电场异常变化曲线
(a)NS测向长、短极距原始观测值;(b)NS测向长、短极距差值;
(c)EW测向长、短极距原始观测值;(d)EW测向长、短极距差值
Fig.3 The anomaly curve of Tengchong geo-electric field before Sino Burmese border M5.3,Yingjiang M5.8 earthquakes in 2008 (a)the original observation data of long and short pole pitchs in NS direction;(b)the difference between long and short pole pitchs in NS direction;(c)the original observation data of long and short pole pitchs in EW direction;(d)the difference between long and short pole pitchs in EW direction

图4 2009年姚安M6.0、宾川M5.0地震前腾冲电场的异常变化曲线<br/>(a)NS测向长、短极距原始观测值;(b)NS测向长、短极距差值; <br/>(c)EW测向长、短极距原始观测值;(d)EW测向长、短极距差值<br/>Fig.4 The anomaly curve of Tengchong geo-electric field before Yao'an M6.0,Binchuan M5.0 earthquakes in 2009(a)the original observation data of long and short pole pitchs in NS direction;(b)the difference between long and short pole pitchs in NS direction;(c)the original observation data of long and short pole pitchs in EW direction;(d)the difference between long and short pole pitchs in EW direction

图4 2009年姚安M6.0、宾川M5.0地震前腾冲电场的异常变化曲线
(a)NS测向长、短极距原始观测值;(b)NS测向长、短极距差值;
(c)EW测向长、短极距原始观测值;(d)EW测向长、短极距差值
Fig.4 The anomaly curve of Tengchong geo-electric field before Yao'an M6.0,Binchuan M5.0 earthquakes in 2009(a)the original observation data of long and short pole pitchs in NS direction;(b)the difference between long and short pole pitchs in NS direction;(c)the original observation data of long and short pole pitchs in EW direction;(d)the difference between long and short pole pitchs in EW direction

图5 2010年禄丰M5.1、施甸M4.9地震前腾冲电场异常变化曲线<br/>(a)NS测向长、短极距原始观测值;(b)NS测向长、短极距差值; <br/>(c)EW测向长、短极距原始观测值;(d)EW测向长、短极距差值<br/>Fig.5 The anomaly curve in Tengchong geo-electric field before the earthquakes in 2010 (a)the original observation data of long and short pole pitchs in NS direction;(b)the difference between long and short pole pitchs in NS direction;(c)the original observation data of long and short pole pitchs in EW direction;(d)the difference between long and short pole pitchs in EW direction

图5 2010年禄丰M5.1、施甸M4.9地震前腾冲电场异常变化曲线
(a)NS测向长、短极距原始观测值;(b)NS测向长、短极距差值;
(c)EW测向长、短极距原始观测值;(d)EW测向长、短极距差值
Fig.5 The anomaly curve in Tengchong geo-electric field before the earthquakes in 2010 (a)the original observation data of long and short pole pitchs in NS direction;(b)the difference between long and short pole pitchs in NS direction;(c)the original observation data of long and short pole pitchs in EW direction;(d)the difference between long and short pole pitchs in EW direction

图6 2011年多次中强地震前腾冲电场异常变化曲线<br/>(a)NS测向长、短极距原始观测值;(b)NS测向长、短极距差值; <br/>(c)EW测向长、短极距原始观测值;(d)EW测向长、短极距差值<br/>Fig.6 The anomaly curve in TengChong geo-electric field before several mid-strong earthquakes in 2011 (a)the original observation data of long and short pole pitchs in NS direction;(b)the difference between long and short pole pitchs in NS direction;(c)the original observation data of long and short pole pitchs in EW direction;(d)the difference between long and short pole pitchs in EW direction

图6 2011年多次中强地震前腾冲电场异常变化曲线
(a)NS测向长、短极距原始观测值;(b)NS测向长、短极距差值;
(c)EW测向长、短极距原始观测值;(d)EW测向长、短极距差值
Fig.6 The anomaly curve in TengChong geo-electric field before several mid-strong earthquakes in 2011 (a)the original observation data of long and short pole pitchs in NS direction;(b)the difference between long and short pole pitchs in NS direction;(c)the original observation data of long and short pole pitchs in EW direction;(d)the difference between long and short pole pitchs in EW direction

图7 2012年宁蒗M5.7地震前腾冲电场异常变化曲线<br/>(a)NS测向长、短极距原始观测值;(b)NS测向长、短极距差值; <br/>(c)EW测向长、短极距原始观测值;(d)EW测向长、短极距差值<br/>Fig.7 The anomaly in Tengchong geo-electric field before Ninglang M5.7 earthquake in 2012 (a)the original observation data of long and short pole pitchs in NS direction;(b)the difference between long and short pole pitchs in NS direction;(c)the original observation data of long and short pole pitchs in EW direction;(d)the difference between long and short pole pitchs in EW direction

图7 2012年宁蒗M5.7地震前腾冲电场异常变化曲线
(a)NS测向长、短极距原始观测值;(b)NS测向长、短极距差值;
(c)EW测向长、短极距原始观测值;(d)EW测向长、短极距差值
Fig.7 The anomaly in Tengchong geo-electric field before Ninglang M5.7 earthquake in 2012 (a)the original observation data of long and short pole pitchs in NS direction;(b)the difference between long and short pole pitchs in NS direction;(c)the original observation data of long and short pole pitchs in EW direction;(d)the difference between long and short pole pitchs in EW direction