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Seismic Investigation of Lithospheric Strain: The Red Sea Rift

岩石圈应变的地震研究：红海裂谷

基本信息

批准号：
0313988
负责人：
Jeffrey Park
金额：
$ 7.87万
依托单位：
Rutgers University New Brunswick
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2002
资助国家：
美国
起止时间：
2002-09-01 至 2004-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0313988&HistoricalAwards=false
关键词：
Seismic Investigation Lithospheric Strain Red

项目摘要

EAR-0208031Jeffrey J. ParkIn the Red Sea region, a continental shield has rifted to form an incipient ocean basin. Several stages of the continental rifting process are evident in the region, ranging from the formation of genuine oceanic crust in central Red Sea to transcurrent pull-apart motion along the Dead Sea transform. Surface features of this rifting are well mapped, but the extent and geometry of ductile shear in the underlying lower crust and mantle lithosphere are unknown. The use of seismic anisotropy as a proxy for the deformation of the lower crust and upper mantle became widespread with the advent of broadband digital seismic data recording. However, only a small subset of data available from permanent seismic observatories in the Red Sea region has been explored with techniques that address anisotropic properties directly. The investigators will study the structure and the texture of the lower crust and the shallow mantle in the Red Sea region using seismic observables that diagnose elastic anisotropy - teleseismic shear wave splitting and receiver functions. These two techniques are largely complementary: shear-wave splitting integrates anisotropy along the path of a shear wave, while P-S converted waves are sensitive to velocity and anisotropy jumps at interfaces. Together they offer a way to constrain vertical variations in anisotropic properties, which should allow us to distinguish inherited rock textures within the Proterozoic-age lithosphere from textures associated with the ongoing continental break-up.

杰弗里·J·帕克在红海地区，一个大陆盾裂开了，形成了一个初生的洋盆。该地区的大陆裂谷过程有几个明显的阶段，从红海中部真正洋壳的形成到死海变换的横流拉分运动。这种裂谷的表面特征已被很好地描绘出来，但下地壳和地幔岩石圈中韧性剪切的程度和几何形状尚不清楚。随着宽带数字地震数据记录的出现，地震各向异性作为下地壳和上地幔变形的指标得到了广泛的应用。然而，从红海地区的永久性地震观测站获得的数据中，只有一小部分可以用直接处理各向异性特性的技术进行勘探。研究人员将利用诊断弹性各向异性-远震剪切波分裂和接收器功能的地震观测资料，研究红海地区下地壳和浅地幔的结构和结构。这两种技术在很大程度上是互补的：横波分裂积分了沿横波路径的各向异性，而P-S转换波对界面上的速度和各向异性跳跃很敏感。它们一起提供了一种限制各向异性性质垂直变化的方法，这应该允许我们区分元古代岩石圈内继承的岩石结构和与正在进行的大陆解体相关的结构。