鲜水河断裂带的断错地貌及其地震学意义

FAULTED LANDFORMS ALONG THE XIANSHUIHE FAULT ZONE AND THEIR SEISMOLOGICAL SIGNIFICANCE

断层的近代位错必将在地貌形态上留下深刻的印记,因而凭借断错地貌现象有可能得到关于活断层上地震活动性的重要信息。鲜水河断裂带上的断错地貌现象表明,断层以间歇性的地震滑动为特征,而且服从于大小相当的地震在原地重复发生的特征地震模式。断错水系的演化图象则进一步提供了在一定时段内,同一地点滑动速率基本稳定的线索。于是,可以把断错地貌的研究作为地震活动性研究的重要手段。

Recent displacements along the fault will certainly produce pronounced markings on the landforms. Therefore, it is possible to acquire some important informations about seismic activity along active fault by using these land' features-faulted landforms. Faulted landforms along the Xianshuihe fault indicate that the fault is characterized by intermittent earthquake displacements which follow the characteristic earthquake model for the recurrence of earthquakes with the same size at the same place. The pattern of the progressive evolution of offset streams might indicate that the slip rate of the fault in the same place is relatively constant during a certain period. Therefore, faulted landforms can be used as an important indicators in the research of seismic activity.