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首页> 外文期刊>Pure and Applied Geophysics >Crust and upper mantle structure in the caribbean region by group velocity tomography and regionalization
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Crust and upper mantle structure in the caribbean region by group velocity tomography and regionalization

机译：群速度层析成像和区域化研究加勒比地区地壳和上地幔结构

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摘要

An overview of the crust and upper mantle structure of Central America and the Caribbean region is presented as a result of the processing of more than 200 seismograms recorded by digital broadband stations from SSSN and GSN seismic networks. Group velocity dispersion curves are obtained in the period range from 10s to 40s by FTAN analysis of the fundamental mode of the Rayleigh waves; the error of these measurements varies from 0.06 and 0.09 km/s. From the dispersion curve, seven tomographic maps at different periods and with average spatial resolution of 500 km are obtained. Using the logical combinatorial classification techniques, eight main groups of dispersion curves are determined from the tomographic maps and eleven main regions, each one characterized by one kind of dispersion curves, are identified. The average dispersion curves obtained for each region are extended to 150s by adding data from a larger-scale tomographic study (V-DOVIN et al., 1999) and inverted using a nonlinear procedure. A set of models of the S-wave velocity vs. depth in the crust and upper mantle is found as a result of the inversion process. In six regions we identify a typically oceanic crust and upper mantle structure, while in the other two the models are consistent with the presence of a continental structure. Two regions, located over the major geological zones of the accretionary crust of the Caribbean region, are characterized by a peculiar crust and upper mantle structure, indicating the presence of lithospheric roots reaching, at least, about 200 km of depth.
机译：通过处理来自SSSN和GSN地震网络的数字宽带站记录的200多个地震图，对中美洲和加勒比地区的地壳和上地幔结构进行了概述。通过对瑞利波基本模态的FTAN分析，在10s至40s的周期范围内获得了群速度色散曲线。这些测量的误差在0.06和0.09 km / s之间变化。从色散曲线中，获得七个不同时期的断层图，平均空间分辨率为500 km。使用逻辑组合分类技术，从断层图确定了八组主要的色散曲线，并确定了11个主要区域，每一个主要区域均具有一种色散曲线。通过添加来自大型层析成像研究的数据（V-DOVIN等，1999），将每个区域获得的平均色散曲线延长至150s，并使用非线性程序进行求逆。作为反演过程的结果，发现了一组地壳和上地幔中S波速度与深度的模型。在六个区域中，我们确定了典型的洋壳和上地幔结构，而在其他两个区域中，模型则与大陆结构一致。位于加勒比地区增生地壳主要地质区域之上的两个区域的特征是奇特的地壳和上地幔结构，表明岩石圈根的存在至少达到了约200 km的深度。

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