TY - JOUR
T1 - A search for a correlation between time change in transfer functions and seismic energy release in northern Taiwan
AU - Chen, Kuang Jung
AU - Chiu, Bonbbon
AU - Lin, Cheng Horng
N1 - Funding Information:
Acknowledgments. The authors are greatly indebted to Mr. Yung-Po Lee, for providing geomagnetic data of the Lunping Geomagnetic Observatory. The authors also wish to thank the staff of World Data Center A for continuously providing many digital magnetograms of the Alice Spring, Wingst (WNG), and Yellow Knife (YKC) observatories during the past several years. The authors would like to thank Prof. C. S. Wang and two anonymous reviewers for many useful comments and suggestions on the original manuscript. This work was supported by the National Sciences Council, ROC under the Grants NSC-91-2119-M-003-002 and NSC-92-2119-M-003-001.
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
KW - Seismic energy release
KW - Taiwan
KW - Transfer function
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U2 - 10.1186/BF03352603
DO - 10.1186/BF03352603
M3 - Article
AN - SCOPUS:33750214027
SN - 1343-8832
VL - 58
SP - 981
EP - 991
JO - Earth, Planets and Space
JF - Earth, Planets and Space
IS - 8
ER -