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Earth, Planets and Space

, Volume 58, Issue 8, pp 981–991

First Online: 16 September 2006Received: 17 September 2005Revised: 18 December 2005Accepted: 05 February 2006

Abstract

The geomagnetic data of the Lunping Geomagnetic Observatory from 1988 to 2000 are utilized for computing daily geomagnetic transfer functions. The method of analysis is based on the power spectrum analysis developed by Everett and Hyndman. Monthly means are statistically obtained from these daily values of transfer functions. In order to compare these time changes with seismic activity seismicity, the earthquakes occurring within 150 km from Lunping, with a magnitude ML greater than 4.0, are located. The related energy releases by those earthquakes, summed month by month, are correlated to the transfer functions. After removing the seasonal effect, we find that the time changes of magnitude of Au and Bu real parts of the transfer function for frequencies of 2, 3, 4, and 6 cycles-hour seem to be strongly related to the energy release within the whole study period. Two significant precursors were found from the A and B values, 40 and 20 months before high seismicities, respectively.

Key wordsTransfer function seismic energy release Taiwan  Download to read the full article text



Autor: Kuang-Jung Chen - Bonbbon Chiu - Cheng-Horng Lin

Fuente: https://link.springer.com/







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