Structure and Mechanics of Seismogenic Fault Zones; A Comparative Study of Transtensional Faulting in Yunnan Province, China and Western Cordillera, United States

本项目将研究中国云南省张拉断裂的构造和地震破裂特征，并将云南断裂的特征与美国盆地-山脉和落基山脉两省的张拉断裂的特征进行比较和对比。这项工作将与中国北京国家地震局地质研究所的中国同事共同完成。本文的研究目标是：(1)建立金川—洱源伸展带的区域构造运动学模型；(2)建立选定断裂带的构造力学模型；(3)对这些模型进行孕震破裂特征的解释。(4)将预测行为与历史和古地震记录进行比较。云南的工作将与美国西部盆地-山脉和落基山脉地区的活动断裂带的类似研究相结合，以进一步了解地质结构与地壳地震活动之间的关系。

This project will investigate the structural and earthquake rupture characteristics of transtensional faulting in Yunnan Province, China and will compare and contrast the characteristics of faulting in Yunnan with extensional faulting in the Basin- Range qnd Rocky Mountain Provinces of the United States. The work will be done in conjunction with Chinese collegues from the Geological Institute of the State Seismological Bureau, Beijing, China. The bjectives of this research are (1) to establish a regional kinematic model of tectonics in the Jinchuan--Eryuan extensional zone, (2) construct structural-mechanical models of selected fault zones, (3) interpret these models in terms of seismogenic rupture characteristics, and (4) compare the predicted behavior with that observed in the historical and paleo-seismological record. The work in Yunnan will be integrated wtih similar studies of active fault zones in the Basin-Range and Rocky Moutain regions of the western U.S. in an effort to further understanding of the relations between geologic structure and crustal seismogenics in general.