• 责任者：Wang Wuxing (Laboratory of Computational Geodynamics ; Graduate University of Chinese Academy of Sciences ; Beijing 100049 ; China) ; Ding Jianhai
• 刊名：Acta Seismologica Sinica
• 出版年：2009
• 卷期：31(2)
• 关键词：地震前兆 ; precursor ; 地震预测 ; earthquake prediction ; 龙门山断裂带 ; Longmenshan Fault Zone
• 页码：p.172-179
• 图表：5 illus., 1 table, 10 refs.
• 分类号：0500
• issnNo：ISSN0253-3782
• isbnNo：CN11-2021/P

Before strong earthquakes the diurnal variation of geomagnetic vertical component menifests itself mainly in phase and amplitude changes. Based on the data recorded by geomagnetic observatories in oft-com:office:smarttags" />China for many years, anomalous features of the appearance time of the minima in diurnal variation of the geomagnetic vertical components, and the variation of their spatial distribution, before the 2008 Wenchuan M_S8.0 earthquake have been studied. The strong aftershocks after two months quiescence of M6 aftershocks after the M_S8.0 event were predicted based on these studies. There are good correlations between these rare geomagnetic anomalies and the occurrences of earthquakes. It has been found that most earthquakes occurred near the boundary line of sudden changes of the low point time and within four days before or after the 27th or 41st day since the appearance of the anomaly in general. In addition, the imminent anomalies in diurnal variation amplitudes near epicentral areas before the Wenchuan M_S8.0 earthquake have been studied.