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Short-term and imminent geomagnetic anomalies of the Wenchuan M_S8.0 earthquake and exploration on earthquake forecast

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Earthquake Science 2009年第2期22卷 135-141页

作者： Wuxing Wang Jianhai Ding Surong Yu Yongxian Zhang Laboratory of Computational Geodynamics Graduate University of Chinese Academy of Sciences Beijing 100049 China Institute of Earthquake Science China Earthquake Administration Beijing 100036 China China Earthquake Networks Center China Earthquake Administration Beijing 100045 China

The diurnal variation of the geomagnetic vertical component is exhibited mainly by changes of phase and amplitude before strong earthquakes. Based on data recorded by the network of geomagnetic observatories in China for many years, the anomalous features of the appearance time of the minima of diurnal variations （i.e, low-point time） of the geo- magnetic vertical components and the variation of their spatial distribution （i.e, phenomena of low-point displacement） have been studied before the Wenchuan Ms8.0 earthquake. The strong aftershocks after two months＇ quiescence of M6 aftershocks of the Ms8.0 event were forecasted based on these studies. There are good correlativities between these geomagnetic anoma- lies and occurrences of earthquakes. It has been found that most earthquakes occur near the boundary line of sudden changes of the low-point time and generally within four days before or after the 27th or 41st day counting from the day of the appearance of the anomaly. In addition, the imminent anomalies in diurnal-variation amplitudes near the epicentral areas have also been studied before the Wenchuan earthquake.

关键词： geomagnetic low-point displacement diurnal-variation amplitude Wenchuan earthquake short-term and imminent geomagnetic anomaly forecast of strong earthquakes

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geomagnetic diurnal-variation anomalies and their relation to strong earthquakes

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Acta Seismologica Sinica(English Edition) 2004年第Z1期17卷 85-93页

作者： DING Jian-hai(丁鉴海) LIU Jie(刘杰) YU Su-rong(余素荣) XIAO Wu-jun(肖武军) Institute of Earthquake Science China Earthquake Administration Beijing 100036 China

The diurnal-variation anomalies of the vertical-component in geomagnetic field are mainly the changes of phase and amplitude before strong earthquakes. On the basis of data recorded by the network of geomagnetic observato- ries in China for many years, the anomalous features of appearance time of the minima of diurnal variations (i.e, low-point time) of the geomagnetic vertical components and the variation of their spatial distribution (i.e, phe- nomena of low-point displacement) have been studied before over 30 strong earthquakes with MS≥6.6 such as Kunlunshan MS=8.1 earthquake on November 14, 2001; Bachu-Jashi MS=6.8 earthquake on February 24, 2003; Xiaojin MS=6.6 earthquake on September 22, 1989, etc. There are good relations between such rare phenomena of geomagnetic anomalies and the occurrence of earthquakes. It has been found that most earthquakes occur in the vicinity of the boundary line of sudden change of the low-point displacement and generally within four days before and after the 27th or 41st day counting from the day of appearance of the anomaly. In addition, the anomalies of diurnal-variation amplitude near the epicentral area have been also studied before Kunlunshan MS=8.1 earthquake and Bachu-Jiashi MS=6.8 earthquake.

关键词： geomagnetic diurnal-variation anomalies geomagnetic low-point displacement diurnal-variation amplitude strong earthquake

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