【摘要】 利用小波多尺度分析对云南及周边地区的布格重力异常场进行分解,并选用振荡较为平缓、光滑,且具有较好对称性、紧支撑性和较高消失矩的小波基函数进行计算,同时使用功率谱分析方法对异常场分解结果计算获得对应的场源深度。分解结果与地质解释表明:云南及周边地区地壳、上地幔物质存在明显的横向不均匀性,深部隆坳中心有北向偏移的现象;区内重力异常梯度带、转换带多与断裂展布吻合;云南作为强震多发区,其地震发生多受活动断裂控制,区内重力异常条带、复杂异常区与地震分布具有一定的相关性。更多还原

【Abstract】 The Bouguer gravity anomaly was decomposed in Yunnan and its surrounding areas by the wavelet multiscale analysis based on the wavelet basis function,which satisfied smooth oscillation,better symmetry,compact support,and high-order vanishing moment. And using power spectrum analysis,we calculated the gravity anomalies decomposed result to obtain its corresponding depths of sources. Combined the decomposed results with geological interpretation,we found that there was a significant lateral heterogeneity in the crust and the upper mantle in Yunnan and its surrounding areas. The center of uplifting subsidence area migrated to northwards in the deep of earth. The distribution of most gradient zones and the transition zones of the gravity anomaly matched the location of the fault distribution. As an earthquake-prone area,the earthquake activity in Yunnan was most likely controlled by active faults. The anomalous gravity belts,multi-anomaly zones had correlation with the distribution of earthquake in Yunnan and its surrounding areas.更多还原