【摘要】 采用地磁加卸载响应比方法,对云南地区的数字化地磁垂直分量(Z)日变幅值进行计算,研究2009年1月—2013年3月以来云南地区发生的8组M_S≥5.0地震前的异常变化。结果显示,加卸载响应比值出现高值异常对云南地区短期内发生M_S5.0以上地震有一定指示意义,尤其是M_S5.5以上地震,对应效果较好。更多还原

【Abstract】 The data of daily amplitude variation(AZ) of digital geomagnetic vertical component(Z) in Yunnan area are calculated with the method of geomagnetic loading-and-unloading response ratio.The anomaly changes before the 8earthquake cases with M_s≥5.0in Yunnan region from January 2009 to March 2013 are studied.The results show that the anomaly high value of response ratio has certain instruction significance to impending of earthquake with M_s≥5in the short term in Yunnan area,especially the impending of earthquakes with M≥5.5.更多还原