STUDIES ON THE PRECURSORS OF AN EARTHQUAKE AS THE VLF ELECTROMAGNETIC SFERICS

被引：0
作者：
De, S. S. [1 ]
De, B. K. [2 ]
Bandypadhyay, B. [1 ]
Paul, Suman [1 ]
De, D. [1 ]
Baru, S. [1 ]
Sanfui, Minu [1 ]
Pal, Pinaki [3 ]
Das, T. K. [1 ]
机构：
[1] Univ Calcutta, SK Mitra Ctr Res Space Environm, Inst Radio Phys & Elect, Kolkata 700009, W Bengal, India
[2] Tripura Univ, Dept Phys, Agartala 799130, India
[3] Maharaja Bir Bikram Coll, Dept Phys, Agartala 799004, Tripura, India
来源：
ROMANIAN JOURNAL OF PHYSICS | 2011年 / 56卷 / 9-10期
关键词：
Ionospheric perturbations; earthquake precursors; seismicity; seismo-electromagnetics; IONOSPHERIC PERTURBATIONS; EMISSIONS; SATELLITE;
D O I：
暂无
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The observation and analyses of pre-seismic VLF electromagnetic (EM) signals recorded by VLF receivers at frequencies 5, 7, 9 and 12 kHz on November 16, 2008 over Kolkata (Lat. 22.56 degrees N, Long. 88.5 degrees E) during the large earthquake at Minahasa, Sulawesi, under Indonesia (Lat. 1.27 degrees N, Long. 122.09 degrees E) will be presented. Spiky variations of signals are observed few days prior to the day of occurrence of the earthquake which continued several days more, then decayed gradually and eventually ceased. These signals are critically examined to delineate their correlation with earthquake. The time variability of natural EM signals in the VLF band is juxtaposed with the pre-seismic records.
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页码：1208 / 1227
页数：20
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