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由50余个测点的大地电磁测深资料,讨论了该区的地壳-上地幔电性横向变化特征。按照上地幔第一低阻层顶面埋深,将测区划分为四类地区:浅埋深(55-90公里)、中浅埋深(90-110公里)、中深埋深(110-160公里)和深埋深(160-250公里)。讨论了本区六次大震例的深部电性背景。指出了上地幔顶部的梯度带地区、地壳内电性横向变化剧烈的地区和地壳内存在局部特殊增厚的低阻层地区将可以作为潜在震源区的深部电性判据之一。
Based on the geomagnetic bathymetry data of more than 50 measuring points, the characteristics of the crustal-upper mantle electrical lateral variation in this area are discussed. According to the top buried depth of the first low resistivity layer in the upper mantle, the survey area is divided into four types of areas: shallow depth (55-90 km), shallow depth (90-110 km), middle depth (110- 160 km) and deep depth (160-250 km). The deep electrical background of six large earthquakes in this area is discussed. It is pointed out that one of the deep electric potential criteria for the potential source region is the region with gradient zone at the top of the upper mantle, the region with drastic lateral electrical changes in the crust, and the region with low resistivity in the crust with locally special thickening.