The evolution characteristics of positive and negative earthquakes before strong quakes in Kanto area and the Hyugo earthquake in Japan |
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| Authors: | Yu-Cang Wang Zhi-Ping Song Wakayama Xue-Zhong Chen and Xiang-Chu Yin |
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| Institution: | (1) Institute of Geophysics, State Seismological Bureau, 100081 Beijing, China;(2) Institute of Seismology, State Meteorology Department, Tokyo, Japan;(3) Center for Analysis and Prediction, State Seismology Bureau, 100036 Beijing, China;(4) LNM (Laboratory of Nonlinear Mechanics), Institute of Mechanics, Chinese Academy of Sciences, 100080 Beijing, China;(5) Beijing Earthquake Bureau, 100030 Beijing, China |
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| Abstract: | This paper studies the evolution charateristics of positive and negative quakes before Hyugo earthquake of M =7.2 and several strong quakes in Kanto area in Japan.The results show that the earthquakes over a certain megnitude are mainly positive ones a certain time before the main shock in or near the focal regions of most strong quakes,and form a concentratingintervals of positive quakes,The main quakes generally locate in or near the areas of positive quake distribution.Negative quakes often occur several months before the main shocks (not excluding positive ones), with the decrease of LURR (Loading/Unloading Response Ratio) values.It possibly shows that earthquake generating process has come to a short term stage.These characteristics may help to predict the time and location of the future earthquakes,and have been applied to the preliminary prediction of the time and the location of the earthquake of M =6.6 on Sep.11,1996 in Kanto area. |
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| Keywords: | Load/Unload Response Ratio (LURR) positive and negative quake earthquake prediction Hyugo earthquake |
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