【摘要】 通过对包头6.4级地震前较大范围前兆资料的研究,认为一个强烈地震在发生之前,围绕震中区不同区域内,将出现具有不同特征的前兆场异常群。其近场(△≤100km)的主要特征是具有较长时间尺度的趋势性异常;中场(100km<△≤200km)的主要特征是趋势和突发性异常并重;而远场(△>200km)则一般无趋势性异常,只有急剧变化的短临异常。更多还原

【Abstract】 In this paper,by studying precursory data of large range before Baotou earthquake(Ms6.4),the authors suggested that anomalies group of precursor field may appear with different features before a strong earthquake in different areas around the epicenter.The main character of the near field(≤100km)is a tendency anomaly with relatively long time scale;the main character of the middle-far field(100km<<200km)showed both tendency and sudden anomalies;but the distant field,generally speaking,showen no anomalies,only showed short term and imminent precursors of the earthquake.更多还原