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Studies on the precursors of an earthquake as the VLF electromagnetic sferics
S S DE, B K DE, B BANDYOPADHYAY, S PAUL, D DE, S BARUI, S MINU, P PINAKI, T K DAS
Published in EDITURA ACAD ROMANE
2011
Volume: 56
   
Issue: 43718
Pages: 1208 - 1227
Abstract
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° N, Long. 88.5° E) during the large earthquake at Minahasa, Sulawesi, under Indonesia (Lat. 1.27° N, Long. 122.09° 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.
About the journal
JournalRomanian Reports of Physics
PublisherEDITURA ACAD ROMANE
ISSN1221-146X