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用地震活动资料研究了青藏高原东北地区的现代构造运动特征 .地震活动证据表明 ,青藏高原东北地区活动块体之间是以复杂的变形带接触的 .甘 -青地块与阿拉善地块之间有一个宽阔的挤压变形带 ,该挤压带东南端转变为以网络状水平剪切变形为主 .甘 -青地块与鄂尔多斯地块接触的六盘山地区处于 NE- SW向的挤压变形之中 .鄂尔多斯地块与阿拉善地块间有一个具有拐折结构的剪切变形带 ,鄂尔多斯地块的西北角和东南缘处于 NNW- SSE方向的受拉伸状态 .该区现代构造变形特征可能与青藏高原向东北的挤压作用、鄂尔多斯地块的阻挡作用以及高原物质向东南方向挤出运动有关
Seismic activity data have been used to study the tectonic movement of the northeastern region of the Qinghai-Tibet Plateau. Seismic evidence indicates that the active blocks in the northeastern Qinghai-Tibetan Plateau are in contact with complex deformation zones, and the Gansu-Qinghai block and Alashan block There is a wide crustal deformation zone, and the southeast end of the crustal belt transforms into a network-like horizontal shear deformation. The Liupanshan area, where the Gansu-Qinghai block is in contact with the Ordos block, is in the NE-SW extrusion In the deformation, there is a shear deformation belt with inflexible structure between the Ordos block and the Alashan block, and the northwest corner and southeast edge of the Ordos block are in the tensile state in the NNW-SSE direction. The features may be related to the extrusion to the northeast of the Qinghai-Tibet Plateau, the blocking of the Ordos block and the southerly extrusion of plateau material