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对康定M_S6.3地震前后的流动重力观测数据采用正交经验函数(EOF)分析方法进行处理,分析主要模式与资料时段的M_S5.0以上地震震中位置的关系,探讨主要模式代表的物理含义。结果表明,川滇地区7期累积重力观测资料中大于200μGal的数据是偶然误差的概率大于95%。第二模式规格向量和累积重力变化均具有相似的分区特征,2013~2014年6次M_S6.0以上地震和第二模式规格向量正负转换带有超过83.3%的对应率,具备重力长期变化模式。第一模式地震前后规格值序列明显的同震信号、空间相似的4象限分布以及2014年4次M_S6.0以上地震和第二模式规格向量正负转换带100%的对应率表明,该模式代表重力短期变化模式。康定M_S6.3地震前第一模式包含4象限特点,震中位置规格值不断增大,且地震前后变化从负转为正。
The observed data of the mobile gravity before and after the Kangding M_S6.3 earthquake are processed by the method of orthogonal empirical function (EOF), and the relationship between the main mode and the epicenter above M_S5.0 in the data period is analyzed to explore the physical meanings of the main modes. The results show that the probability of accidental errors greater than 95% for the data of more than 200μGal in the accumulated gravity observation data of the 7th stage in Sichuan-Yunnan region is greater than 95%. The second model specification vector and cumulative gravity change have similar zoning characteristics. From 2013 to 2014, six M_S6.0 earthquakes and the second model specification vector positive-negative conversion rate with 83.3% of the corresponding rate, with the long-term changes in gravity model . The co-seismic signals with obvious sequence of values before and after the first mode of earthquake, the four-quadrant with similar spatial distribution and 100% correspondence between positive and negative transition band of 4 M_S6.0 earthquakes in 2014 and the normative vector of the second mode indicate that this mode represents Short-term changes in gravity model. Before the Kangding M_S6.3 earthquake, the first mode contains 4 quadrant characteristics. The epicenter position specifications increase continuously, and the change from negative to positive changes before and after the earthquake.