Preseismicの比抵抗変化-2-(1975年3月1日〜1982年7月31日)
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概要
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During the observation period from Mar. 1, 1975 to July 31, 1982, 35 examples of coseismic resistivity changes were clearly recorded for remarkable earthquakes occurred in and around Japan. Among these, 17 examples show preseismic resistivity changes about a few hours prior to the earthquake occurrence. These preseismic resistivity changes were confirmed by using a numerical digital high-pass filter (Tc=6 hours) for each record showing coseismic resistivity changes. Each pattern of the preseismic resistivity change can be classified into one of the three types, i.e., I, II and III, as previously described in the former report, "Preseismic Resistivity Changes Recorded by the Resistivity Variometer (1) (May 14, 1968～February 28, 1975), Bull. Earthq. Res. Inst., 55, 755-794, 1980". Type I preseismic change is a gradual change leading to a step-like coseismic change, usually starting about 2 to 6 hours prior to the earthquake occurrence. Type II change is a linear decrease or occasionally increase in resistivity, usually starting about 1 to 10 hours prior to the coseismic change. Type III preseismic change is characterized by its short duration of 30 minutes to 1 hours. The change takes place immediately prior to the earthquake occurrence. Up to the present time, 64 examples of coseismic resistivity change and 34 examples of the preseismic resistivity change were clearly recorded by the resistivity variometer at the Aburatsubo Crustal Deformat!on Observatory(137°37′E, 35°09′N). The research on preseismic resistivity change is important for earthquake prediction. Observations by the resistivity variometer system at multiple points are greatly required.
- 東京大学地震研究所,Earthquake Research Institute, University of Tokyo,地震研究所の論文
東京大学地震研究所,Earthquake Research Institute, University of Tokyo,地震研究所 | 論文
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