【摘要】 利用2018～2022年流动地磁场三分量矢量数据，结合甘东南地区活动构造的特征分析了四期岩石圈磁场的年变化特征。研究结果显示：2018～2021年岩石圈磁场水平矢量在华南块体与巴颜喀拉块体和柴达木块体交汇区域以及柴达木块体内部的东昆仑断裂带东段北东向区域有转向、对冲及幅值减小的异常变化，岩石圈磁场磁偏角、总强度、垂直强度也有高梯度带或者明显的正负分区现象；2021～2022年岩石圈磁场模量整体减小，依据磁场与应力的关系可以推断2021～2022年甘东南地区应力处于加载状态，岩石圈磁异常区域迁移至西秦岭北缘断裂带西段至东昆仑断裂带东段之间，该地区地震危险性增强，应重点关注。更多还原

【Abstract】 Based on the three component vector data of mobile geomagnetic field from 2018 to 2022 and the characteristics of active tectonics in southeastern Gansu, this paper analyzes the annual variation characteristics of lithospheric magnetic field in four periods.The research results show that from 2018 to 2021, the horizontal vector of the lithospheric magnetic field have abnormal changes in the intersection area of the South China blocks and the Bayan Har block and the Qaidam block, as well as in the EN direction area of the eastern segment of the East Kunlun fault zone inside the Qaidam block, such as turning, hedging and amplitude reduction.The magnetic declination angle, total strength, and vertical strength of the lithospheric magnetic field also have high gradient zones or obvious positive and negative zoning; From 2021 to 2022, the modulus of the lithospheric magnetic field will decrease as a whole.According to the relationship between the magnetic field and the stress, it can be inferred that the stress in southeast Gansu will be in the loading state from 2021 to 2022.The lithospheric magnetic anomaly will migrate to the western segment of the fault of the northern edge of the West Qinling Mountains to the Diebu Bailongjiang fault zone.The seismic risk of this area will increase, which should be paid more attention.更多还原