Abstract:We use geomagnetic omnidirectional intensity profile data across the east Dabie orogenic belt as a foundation. After a series of processing steps, including diurnal reduction, standard reduction to pole, and extraction of the local anomalous field from regional field, we obtain the regional anomalous field. Based on the regional anomalous field, we use the approximate linear inversion method to calculate the average buried depth of Curie interface along the profile, which is 24 km with a maximum 6 km fluctuation. It is found that the depth of the hypocenter in the last 30 years presents dominance distribution between 1 km and 30 km in the study area and its vicinity. The foregoing data shows that the ‘earthquake layer’ coheres well with the ‘magnetic layer’. Combining geologic background with geotectonic evolution, we obtain the seismic precursor relationship with geomagnetic structural features.
XIAO Weipeng,WANG Lei,ZHANG Yi et al. Study of Geotectonic Characteristics in Eastern Dabie Orogenic Belt Based on Anomalous Variation of Seismomagnetism[J]. jgg, 2017, 37(8): 819-823.