昭觉盆地新构造运动特征及意义

Characteristics and Significance of Neotectonic Movement in the Zhaojue Basin

通过对昭觉断陷盆地边界活动断层、阶地发育阶次、夷平面发育特征调查分析;对盆内记录地震的发育特征统计研究。获得认识:①昭觉断陷盆地存在新构造运动,边界断层现今表现为弱逆错断和地热;②盆内至少经历了四次构造抬升作用,中更新世构造抬升幅度最大、频次最高;③盆内构造应力分布特征与区域构造应力分布一致,均为北西向强于南东向;④区内新构造运动主要表现为构造抬升、掀斜,左旋走滑;⑤昭觉县需加强边界断裂附近地震监测。

A study of boundary active fault,terrace development order,and planation surface development characteristics of the Zhaojue Rift Basin indicates that there is neotectonic movement in the Rift Basin with the boundary active fault as weak reverse fault and geothermal activity.The basin underwent at least four times of tectonic uplift with the largest amplitude and the highest frequency during the Middle Pleistocene.The tectonic stress distribution in the basin is consistent with the regional tectonic stress distribution.The neotectonic movement in the area is characterized by tectonic uplift,tilting and sinistral strike-slip.Zhaojue County needs to strengthen seismic monitoring near boundary faults.