CAJ | 학술논문

青藏地块活动区南部的II级拉萨和羌塘地块内部的M≥6.5强震活动比北部的巴颜喀拉、柴达木和祁连II级地块内部明显活跃, 这可能与拉萨和羌塘地块处于地壳厚度较大、较高的热状态和较低的正断层剪切强度等地学背景下, 导致地壳强度较弱有关. 拉萨和羌塘地块内部两次拉张性正断层活动的强震(2008年于田7.3级和当雄6.6级)前热异常的震例, 可能与临震前孕震区及邻近断层带扩容, 以及中下地壳低速层熔融物质或流体的进入有关.
청장지괴활동구남부적II급랍살화강당지괴내부적M≥6.5강진활동비북부적파안객랍、시체목화기련II급지괴내부명현활약, 저가능여랍살화강당지괴처우지각후도교대、교고적열상태화교저적정단층전절강도등지학배경하, 도치지각강도교약유관. 랍살화강당지괴내부량차랍장성정단층활동적강진(2008년우전7.3급화당웅6.6급)전열이상적진례, 가능여림진전잉진구급린근단층대확용, 이급중하지각저속층용융물질혹류체적진입유관.
There are relatively active strong seismicity inside the second-order Lasa and Qiangtang blocks compared with other blocks in the first-order Qing-Zang active block region, which might be related to the weaker crust strength due to thicker crust, higher heat and lower shear strength on normal fault there. Inside the second-order Lasa and Qiangtang active blocks, cases of abnormal heat phenomenon have been observed before two strong earthquakes(M7.3 Yutian earthquake and M6.6 Danxion earthquake in 2008) , which might be related to the dilatation in the faults of earthquake preparation region and nearby, where melting material and liquid enter into from the low velocity layer in upper-middle crust.