Use of wavelet analysis for detection of seismogenic ULF emissions
Use of wavelet analysis for detection of seismogenic ULF emissions
复制标题
使用小波分析检测引发地震的超低频辐射
DOI：
10.1029/2002rs002687
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发表时间：
2003
期刊：
影响因子：
1.6
通讯作者：
M. Hayakawa
中科院分区：
文献类型：
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作者：
L. Alperovich;V. Zheludev;M. Hayakawa
小波分析应用于地震活跃区的高分辨率磁超低频数据，以确定是否存在地震前或伴随地震的超低频电磁辐射的证据。我们已经开发了一种算法，特别适合于地磁事件的单站小波检测。为此，我们构建了某些地震的基于小波的磁特征。也就是说，我们已经使用了由小波包变换的系数组成的块之间的能量分布。我们的计算机实验表明，两次强震前的共同特征出现在震中附近（约20公里）记录的地磁场中。异常的时间跨度很大（10 ~ 250 s）. 1997年3月26日日本九州5.6级强震时，也发现了短周期孕震脉冲的存在。对震中区两个地磁台提取的地磁变化进行了比较，结果表明，地震前6 ~ 7小时发生了孕震地磁扰动。
Wavelet analysis is applied to high‐resolution magnetic ULF data in a seismoactive region to determine whether there is evidence of ULF electromagnetic emissions that precede or accompany earthquakes. We have developed an algorithm that is specially adapted to the single‐station wavelet detection of geomagnetic events. For this purpose we have constructed wavelet‐based magnetic signatures of certain earthquakes. Namely, we have used the distribution of energies among blocks consisting of coefficients of wavelet packet transforms. Our computer experiments have shown that common features preceding two strong earthquakes appear in geomagnetic fields recorded close (around 20 km) to the epicenter of the earthquakes. The anomalies occupy a wide range of periods (from 10 s to 250 s). Evidence was also found on the presence of short period seismogenic pulses associated with a strong earthquake (M = 5.6) on March 26, 1997, in Kyushu, Japan. A comparison of extracted geomagnetic variations at two observatories located in its epicentral zone has indicated that seismogenic geomagnetic disturbances occurred 6 to 7 hours prior to the earthquake.
2000年7月伊豆群岛地震ULF地磁数据主成分分析
DOI：
--
发表时间：
2002
期刊：
Journal of Atmospheric Electricity 22
影响因子：
--
作者：
Gotoh;K.;Akinaga;Y.;Hayakawa;M.;Hattori;K.
通讯作者：
K.