Abstract:In this paper, firstly, we introduce the basic principle and the key technology of BEMD method; Secondly, the model test proves that the bi-dimensional intrinsic mode function (BIMF) at all levels and the residue by BEMD method, which own their practical geological meaning; Lastly, the BEMD method is innovatively applied to deal with the mobile gravity anomalies of differential dynamic variation of the period of 2015-09~2016-09 so as to obtain the multi-scale decomposition and the extracted anomalies at all levels are analyzed, and then we reconstruct the local and region anomalies with BIMFs and residue, and the results show that the weak anomalies in the region area at a certain frequency range decomposed by BEMD method, can be enhanced relatively, the regional anomaly characteristics become more obvious, and then we can propose the suggestion about the earthquake trend according to the features of abnormal changes.
ZHANG Shuangxi,CHEN Zhaohui,WANG Tongqing et al. The Extraction of Abnormal Feature of Mobile Gravity in the Sichuan-Yunnan Region Using BEMD Method[J]. jgg, 2018, 38(4): 407-413.