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

德米特9526419派提出了一个全球定位系统项目，旨在测量横跨墨西哥西部哈利斯科州的大地纪念碑网络的地壳形变。哈利斯科地区是一个火山和构造复杂的地质省，位于俯冲的里维拉和科科斯板块之上，显示出现代变形的证据，主要局限于三个大陆裂谷。他们的目标是了解该区域海洋和大陆板块的相对运动学，从而了解它们之间的耦合，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的联系的几个假设。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GPS技术，所需的测量现在是可行的。对北美板块附近地点的哈利斯科块体速度的观测也使我们能够检验这一耐人寻味但却是推测的假设，即半刚性哈利斯科的旋转是沿其边界断层观察到的变形的原因。1996年10月发生在该地区的7.6级地震为研究哈利斯科地区的同震应变和震后应变提供了难得的机会。

DeMets 9526419 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.