华县一兰田断裂为第四纪前基岩断裂。野外工作和TEM研究表明:该断裂从燕山运动期直至喜山运动晚期仍有活动。最后一次活动或较强期的构造变形条件为低温和高的应变速率,很可能与地震事件有关。该断裂带目前仍处在加工硬化阶段,综合机械性能较差,应引起有关学科的重视。 The Yilan-Lantian fault was a Quaternary bedrock fracture. Field work and TEM studies show that the fault still has activity from the Yanshan movement period to the late Himalayan movement. The last event or strong tectonic deformation was a low temperature and high strain rate, most likely related to seismic events. The fault zone is still in the stage of work hardening. The comprehensive mechanical properties are poor, which should arouse the attention of relevant disciplines.