1引言。地震电磁辐射现象是指伴随着地震孕育过程而产生的电磁辐射源释放出的某种电磁信号,且大多出现在地震前几天至几小时内地震孕育的后期,近地表大气层、上大气层、电离层、甚至磁层都存在电磁辐射异常(Pulinets et al,2004)。因此...1引言。地震电磁辐射现象是指伴随着地震孕育过程而产生的电磁辐射源释放出的某种电磁信号,且大多出现在地震前几天至几小时内地震孕育的后期,近地表大气层、上大气层、电离层、甚至磁层都存在电磁辐射异常(Pulinets et al,2004)。因此,具有短临预测的应用前景。于海雁等(2010)对DEMETER卫星记录的电磁数据研究发现,电磁辐射呈现出很强的平面波特征,传播方向为上行传播;曾中超等(2009)利用DEMETER卫星于地震前3—7天在震中附近记录到了电子浓度、电子温度和氧离子浓度出现的剧烈变化(变化率均超20%)。展开更多
A destructive shock with magnitude of 6.3 occurred on 2 June 2007 at 21h34min56s UT in Pu’er region (23.0°N, 101.1°E), Yunnan Province, China. The data from DEMETER satellite during the period from 23 May t...A destructive shock with magnitude of 6.3 occurred on 2 June 2007 at 21h34min56s UT in Pu’er region (23.0°N, 101.1°E), Yunnan Province, China. The data from DEMETER satellite during the period from 23 May to 2 June, i.e., ten days before the earthquake and one day just on the day of earthquake occurrence, were analyzed. Among the 284 orbits of DEMETER during the period, 29 orbits with the trace passing through the region within 1 888 km from the epicenter were selected to be studied. Seven anomalous events were found on the dataset of the seven orbits among the 29 ones. There existed synchronous perturbations on the variations of the spectrogram of the electric field and the variations of the density and temperature of the ions and electron, in contrast with the variations of its surround- ing area. And five events appeared in the space within 1 888 km from the epicenter while the other two were out of the studied area. Electrostatic turbulences were also recorded with the synchronous perturbations with that in the electron density and ions density in plasma in the region near the epicenter in the five events, which seems to sug- gest that there be some physical relation between these events and the preparation processes of Pu’er earthquake.展开更多
该文旨在解译DEMETER卫星载荷的二进制数据格式,并实现海量电磁数据导入ORACLE数据库的入库技术,为高效分析卫星数据和研究地震-电磁效应奠定基础。考虑到海量数据入库耗时太长,因此基于入库效率提出了3种不同的数据入库方法,并采用C...该文旨在解译DEMETER卫星载荷的二进制数据格式,并实现海量电磁数据导入ORACLE数据库的入库技术,为高效分析卫星数据和研究地震-电磁效应奠定基础。考虑到海量数据入库耗时太长,因此基于入库效率提出了3种不同的数据入库方法,并采用C和OO4O(Oracle Objects for OLE)接口编程实现。从入库耗时和后续科学分析的便利性对3种入库方法的效率进行比较和分析,采用最优方案建立了Demeter卫星数据库,为后期基于Oracle的高效数据读取和分析提供了技术依据。展开更多
文摘1引言。地震电磁辐射现象是指伴随着地震孕育过程而产生的电磁辐射源释放出的某种电磁信号,且大多出现在地震前几天至几小时内地震孕育的后期,近地表大气层、上大气层、电离层、甚至磁层都存在电磁辐射异常(Pulinets et al,2004)。因此,具有短临预测的应用前景。于海雁等(2010)对DEMETER卫星记录的电磁数据研究发现,电磁辐射呈现出很强的平面波特征,传播方向为上行传播;曾中超等(2009)利用DEMETER卫星于地震前3—7天在震中附近记录到了电子浓度、电子温度和氧离子浓度出现的剧烈变化(变化率均超20%)。
基金Special Project for Earthquake Monitoring of China Earthquake Administration.
文摘A destructive shock with magnitude of 6.3 occurred on 2 June 2007 at 21h34min56s UT in Pu’er region (23.0°N, 101.1°E), Yunnan Province, China. The data from DEMETER satellite during the period from 23 May to 2 June, i.e., ten days before the earthquake and one day just on the day of earthquake occurrence, were analyzed. Among the 284 orbits of DEMETER during the period, 29 orbits with the trace passing through the region within 1 888 km from the epicenter were selected to be studied. Seven anomalous events were found on the dataset of the seven orbits among the 29 ones. There existed synchronous perturbations on the variations of the spectrogram of the electric field and the variations of the density and temperature of the ions and electron, in contrast with the variations of its surround- ing area. And five events appeared in the space within 1 888 km from the epicenter while the other two were out of the studied area. Electrostatic turbulences were also recorded with the synchronous perturbations with that in the electron density and ions density in plasma in the region near the epicenter in the five events, which seems to sug- gest that there be some physical relation between these events and the preparation processes of Pu’er earthquake.
文摘该文旨在解译DEMETER卫星载荷的二进制数据格式,并实现海量电磁数据导入ORACLE数据库的入库技术,为高效分析卫星数据和研究地震-电磁效应奠定基础。考虑到海量数据入库耗时太长,因此基于入库效率提出了3种不同的数据入库方法,并采用C和OO4O(Oracle Objects for OLE)接口编程实现。从入库耗时和后续科学分析的便利性对3种入库方法的效率进行比较和分析,采用最优方案建立了Demeter卫星数据库,为后期基于Oracle的高效数据读取和分析提供了技术依据。
