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S-Wave Velocities of the Lithosphere-Asthenosphere System in the Caribbean Region

机译：加勒比地区岩石圈-软流圈系统的S波速度

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摘要

An overview of the S-wave velocity (V _s) structural model of the Caribbean with a resolution of 2° × 2° is presented. New tomographic maps of Rayleigh wave group velocity dispersion at periods ranging from 10 to 40 s were obtained as a result of the frequency time analysis of seismic signals of more than 400 ray-paths in the region. For each cell of 2° × 2°, group velocity dispersion curves were determined and extended to 150 s by adding data from a larger scale tomographic study (Vdovin et al., Geophys. J. Int 136:324-340, 1999). Using, as independent a priori information, the available geological and geophysical data of the region, each dispersion curve has been inverted by the "hedgehog" non-linear procedure (Valyus, Determining seismic profiles from a set of observations (in Russian), Vychislitielnaya Seismologiya 4, 3-14. English translation: Computational Seismology (V.I. Keylis-Borok, ed.) 4:114-118, 1968), in order to compute a set of V _s versus depth models up to 300 km of depth. Because of the non-uniqueness of the solutions for each cell, a local smoothness optimization has been applied to the whole region in order to choose a three-dimensional model of V _s, satisfying this way the Occam's razor concept. Several known and some new main features of the Caribbean lithosphere and asthenosphere are shown on these models such as: the west directed subduction zone of the eastern Caribbean region with a clear mantle wedge between the Caribbean lithosphere and the subducted slab; the complex and asymmetric behavior of the crustal and lithospheric thickness in the Cayman ridge; the predominant oceanic crust in the region; the presence of continental type crust in Central America, and the South and North America plates; as well as the fact that the bottom of the upper asthenosphere gets shallower going from west to east.
机译：概述了加勒比海的S波速度（V s）结构模型，其分辨率为2°×2°。通过对该地区400多个射线路径的地震信号进行频率时间分析，获得了10至40 s周期内瑞利波群速度弥散的新层析成像图。对于每个2°×2°的像元，通过添加来自更大范围层析成像研究的数据来确定组速度色散曲线并将其延长至150 s（Vdovin等人，Geophys。J. Int 136：324-340，1999）。使用该区域的可用地质和地球物理数据作为独立的先验信息，通过“ hedgehog”非线性程序（Valyus，根据一组观测值确定地震剖面（俄语），Vychislitielnaya）反转了每个分散曲线Seismologiya 4，3-14。英语翻译：计算地震学（VI Keylis-Borok，ed。）4：114-118，1968），以计算一组V _s对深度模型，最大深度为300 km。由于每个单元格的解的唯一性，已将局部平滑度优化应用于整个区域，以选择V_s的三维模型，从而满足了Occam剃刀概念的要求。这些模型显示了加勒比海岩石圈和软流圈的几个已知的和一些新的主要特征，例如：东加勒比海区域的西向俯冲带，在加勒比海岩石圈和俯冲板之间有明显的地幔楔;开曼海脊地壳和岩石圈厚度的复杂且不对称的行为;该地区主要的洋壳;中美洲，南美和北美板块均存在大陆型地壳;以及软流圈上层的底部从西到东变浅的事实。

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