周口M4.7级地震前的异常研究
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摘要
研究了2010年10月24日周口4.7级地震前的电离层总电子浓度变化以及向外长波辐射变化,认为电离层变化异常值出现在6月17日,在河南南部出现一个电离层低值区,向外长波辐射异常值出现在10月22日至23日,表现为震中区附近的向外长波辐射值为全国最高值,同时稳定分布在该区两天时间.研究认为向外长波辐射异常能够比较准确地确定震中位置,与电离层异常相结合,二者能够比较准确地预测震级和震中,但是对于时间的预测还存在有困难.
On October 24,2010,a M4.7 earthquake occurred in Zhoukou area and this was the biggest one during the last 30 years in Henan Province.We studied the Total Electron Content(TEC) change and Outgoing Longwave Radiation(OLR) change before this earthquake.The result showed that the TEC anomaly appeared on June 17,namely an area with low TEC value appeared in south Henan Province,and the OLR anomaly appeared on October 22～23,namely a maximum OLR value appeared around Zhoukou area,at the same time the anomaly exsited there for about 2 days.According to the OLR anomaly we can estimate the epicenter within such a small distance error as 50 km,and according to the TEC anomaly we can estimate the magnitue.The problem is that estimating earthquake time is still difficult.
On October 24,2010,a M4.7 earthquake occurred in Zhoukou area and this was the biggest one during the last 30 years in Henan Province.We studied the Total Electron Content(TEC) change and Outgoing Longwave Radiation(OLR) change before this earthquake.The result showed that the TEC anomaly appeared on June 17,namely an area with low TEC value appeared in south Henan Province,and the OLR anomaly appeared on October 22～23,namely a maximum OLR value appeared around Zhoukou area,at the same time the anomaly exsited there for about 2 days.According to the OLR anomaly we can estimate the epicenter within such a small distance error as 50 km,and according to the TEC anomaly we can estimate the magnitue.The problem is that estimating earthquake time is still difficult.
引文
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[2]Saroso Sarmoko,Liu Jann-Yeng,Hattori Katsumi andChen Chia-Hung.Ionospheric GPS TEC Anomalies andM>=5.9 Earthquakes in Indonesia during 1993?2002[J].Terr.Atmos.Ocean.Sci.,2008,19(5):481-488.
[3]余涛,等.汶川特大地震前电离层主要参量变化[J].科学通报,2009,54(4):493-499.
[4]刘德富,康春丽.地球长波辐射(OLR)遥感与重大自然灾害预测[J].地学前缘,2003,10(2):427-435.
[2]Saroso Sarmoko,Liu Jann-Yeng,Hattori Katsumi andChen Chia-Hung.Ionospheric GPS TEC Anomalies andM>=5.9 Earthquakes in Indonesia during 1993?2002[J].Terr.Atmos.Ocean.Sci.,2008,19(5):481-488.
[3]余涛,等.汶川特大地震前电离层主要参量变化[J].科学通报,2009,54(4):493-499.
[4]刘德富,康春丽.地球长波辐射(OLR)遥感与重大自然灾害预测[J].地学前缘,2003,10(2):427-435.
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