Collaborative Research: How is Strain of the Eastern California Shear Zone Transferred Across the Garlock Fault?

合作研究：东加州剪切带的应变如何跨加洛克断层传递？

• 批准号: 0643096
• 负责人: Eric Kirby
• 金额: $ 12.96万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-05-15 至 2010-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0643096&HistoricalAwards=false
• 关键词: Collaborative; Research; How; Strain; Eastern

The interaction of intersecting fault systems can be complex and can lead to complicated deformation and overprinting on structures at all scales. An area of particular interest in this regard is in eastern California where the Eastern California shear zone (ECSZ) and the Garlock fault intersect. The ECSZ is a 100 km wide belt of north-northwest trending strike-slip faults of similar type and orientation as the San Andreas fault; the Garlock fault a roughly east trending strike-slip fault of opposite sense of motion. The Garlock is through going whereas faults of the ECSZ seem to end as they approach the Garlock. Although the Garlock appears to be the more continuous structure, GPS and satellite information seem to show that deformation related to the ECSZ passes continuously across it. The project is investigating how these two systems interact at mesoscopic and macroscopic scales. In particular, mapping in the field of faults and folds related to both structural systems is aimed at assessing whether faults of the ECSZ do indeed end (and if so how) before reaching the Garlock. Mapping is also showing if the Garlock is as continuous as previously thought. Samples are also being collected to determine the ages of various offset landforms and surface features. This provides the rate at which each fault is moving. This information complements the mapping showing how the faults end in that the loss of motion can be correlated with the rates of motion. In some locations, Ground Penetrating Radar is used to image how faults are oriented in the subsurface. This information is also critical to assess the rates of motion. By the collection of all these different types of information, the project is attempting to understand in detail the interaction of the ECSZ and Garlock and thus determine how the crust of the earth deforms in areas of complicated faulting. This is critical to understanding the overall deformation of the crust in the western part of North America.

相交断层系统的相互作用可能很复杂，并且可能导致复杂的变形和在各个尺度上的结构上过度打印。 在这方面，特别感兴趣的区域是在加利福尼亚东部的加利福尼亚东部剪切区（ECSZ）和Garlock断层相交。 ECSZ是一条100公里宽的北北部趋势趋势滑移断层，其类型和方向与San Andreas断层相似。 Garlock故障大致向东的趋势滑移断层相反的运动感。 加洛克（Garlock）是通过前进的，而ECSZ的缺点似乎在接近Garlock时结束了。 尽管Garlock似乎是更连续的结构，但GPS和卫星信息似乎表明与ECSZ相关的变形连续通过它。 该项目正在研究这两个系统如何在介观和宏观尺度上相互作用。 特别是，与两个结构系统相关的故障和褶皱领域的映射旨在评估ECSZ的故障是否确实结束了（如果是这样，则在达到Garlock之前）。 映射还显示了Garlock是否像以前想象的那样连续。 还正在收集样品，以确定各种偏移地面和表面特征的年龄。 这提供了每个故障移动的速率。 该信息补充了映射，表明故障如何结束，即运动损失可以与运动速率相关。 在某些位置，将地面穿透雷达用于图像在地下中的断层定向。 此信息对于评估运动速率也至关重要。 通过收集所有这些不同类型的信息，该项目试图详细了解ECSZ和Garlock的相互作用，从而确定地球在复杂的断层区域如何变形。 这对于理解北美西部地壳的总体变形至关重要。