Imaging the Eastern Trans-Mexican Volcanic Belt

GSTDTAP

项目编号	1645063
	Imaging the Eastern Trans-Mexican Volcanic Belt
	Robert Clayton
主持机构	California Institute of Technology
项目开始年	2016
	2016-12-01
项目结束日期	2018-11-30
资助机构	US-NSF
项目类别	Continuing grant
项目经费	88104(USD)
国家	美国
语种	英语
英文摘要	The abrupt end of the Trans-Mexican Volcanic Belt (TMVB) in central Mexico marks a dramatic change in the subduction system that defines the western margin of North America. To the west, the subducted slab is horizontal at 45 km depth until it reaches the TMVB (at the latitude Mexico City) where it plunges into the mantle to a depth of 500 km. To the east the slab descends with a dip of 30-degrees to a depth of 150 km where it is cut off by an unexplained structure. The goal of this study is to understand why these systems are different and how they function together. The larger goal is to find a unified model for the subduction system from the western coast of the United States to Central America. Determining the tectonic structure in this region is important, because it is a transition point in that model. The study will also continue cooperative studies with Mexican scientists that have been ongoing for the past decade. We propose to make a detailed image the structure beneath the eastern end of the TMVB, using receiver functions to map subsurface interfaces in the structure. This method uses the conversion of P-waves to S-waves to determine the location and contrast of the interfaces. To determine the velocity structure of the region we will use surface waves from earthquakes and ambient noise correlations. Both of these techniques can also be used to estimate the anisotropic behavior of the subsurface, which can be used to determine the present and past flow of material. The goal is to integrate the structure and flow into models that can be used to explain the tectonic evolution of this area. The study will exploit several existing seismic datasets in the region, plus a current Mexican project (GECO) that is operating a dozen seismic stations in the region that we plan to image.
来源学科分类	Geosciences - Earth Sciences
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/70611
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Robert Clayton.Imaging the Eastern Trans-Mexican Volcanic Belt.2016.