Collaborative Research: A GPS Investigation of Deformation in the Jalisco Region, Western Mexico

股票 9527810 PI提出了一个GPS项目，旨在测量横跨墨西哥西部哈利斯科州大地测量纪念碑网络的地壳变形。 哈利斯科地区是一个火山和构造复杂的地质省，覆盖在俯冲的里维拉和科科斯板块上，并展示了现代变形的证据，主要局限于三个大陆裂谷。 他们的目标是了解相对运动学，从而了解这一地区大洋板块和大陆板块的耦合，并检验有关俯冲板块运动、进入俯冲带的海底特征和观测到的陆上变形之间联系的几种假设。 由于缺乏对区域应变场的可靠观测，这些假设以前是无法检验的。 有了现代全球定位系统技术，所需的测量现在是可行的。 观测哈利斯科块体相对于北美板块附近位置的速度，也可以让我们检验一个有趣但推测性的假设，即半刚性的哈利斯科的旋转是观测到的沿沿着断层的变形的原因。 1996年10月在该地区发生的7.6级意外地震也为研究哈利斯科的同震和震后应变提供了一个独特的机会。

Stock 9527810 The PI's propose a GPS project that is designed to measure crustal deformation across a network of geodetic monuments spanning that state of Jalisco in western Mexico. The Jalisco region is a volcanically and tectonically complex geologic province that overlies the subducting Rivera and Cocos plates and exhibits evidence for modern deformation primarily confined to three continental rifts. Their goal is to understand the relative kinematics and hence the coupling of the oceanic and continental plates in this regions, as well as to test several hypotheses concerning the link between the motions of the subducting plates, seafloor features entering the subduction zone, and the observed onshore deformation. These hypotheses have previously been untestable due to a lack of reliable observations of the regional strain field. With modern GPS technology, the required measurements are now feasible. Observations of Jalisco block velocities with respect to nearby sites on the North American plate could also permit us to test the intriguing, but speculative hypothesis that rotation of a semi-rigid Jalisco is responsible for the observed deformation along its bordering faults. The October 1996 unexpected magnitude 7.6 earthquake in this area provides a unique opportunity to study the coseismic and postseismic strains in the Jalisco as well.