HR: 0800h
AN: GP11D-0853    [Abstracts]
TI: The relationship between the difference of daily variation in geomagnetic total intensity and seismicity in Taiwan
AU: * Chen, C
EM: s8622012@cc.ncu.edu.tw
AF: Institute of geophysics, National Central University, No.300, Jhongda Rd., Jhongli City, 320 Taiwan
AU: Liu, J
EM: jyliu@jupiter.ss.ncu.edu.tw
AF: Institute of Space Science, National Central University, No.300, Jhongda Rd., Jhongli City, 320 Taiwan
AU: Liu, J
EM: jyliu@jupiter.ss.ncu.edu.tw
AF: Center for Space and Remote Sensing Research, National Central University, No.300, Jhongda Rd., Jhongli City, 320 Taiwan
AU: Yen, H
EM: yenhy@earth.sinica.edu.tw
AF: Institute of geophysics, National Central University, No.300, Jhongda Rd., Jhongli City, 320 Taiwan
AB: The relationship between the difference of daily variation in geomagnetic total intensity and earthquakes were found. The Lunping (25.0\deg N, 121.2\deg E) station located in a seismically quiet area in Taiwan was used to be a reference. The ratios were calculated by other six observation stations data dividing with reference data. It was found the daily variation record 40 km near by observatories could be changed about 100 days before and after an earthquake occurrence. The statistics method was used to remove artificial determinations and define the anomaly in geomagnetic records. The result shows that the magnetic field strength become smaller 100 days prior the earthquake onset and back to normal value about 100 days later.
DE: 1500 GEOMAGNETISM AND PALEOMAGNETISM
DE: 1555 Time variations--diurnal to secular
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2004 AGU Fall Meeting