NACr14: A 3D model for the crustal structure of the North American Continent
NACr14: A 3D model for the crustal structure of the North American Continent
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NACr14：北美大陆地壳结构的 3D 模型
DOI：
10.1016/j.tecto.2014.04.016
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发表时间：
2014
期刊：
影响因子：
2.9
通讯作者：
S. Cloetingh
中科院分区：
文献类型：
--
作者：
M. Tesauro;M. Kaban;W. Mooney;S. Cloetingh
在过去几十年进行的大量地壳地震实验的基础上，我们创建了一个分辨率为1°× 1°的北美大陆三维地壳模型NACr14。我们展示了由美国地质勘探局地壳结构数据库中最新地震地壳模型获得的北美结晶地壳主要层的厚度和平均速度图。然而，地壳数据分布不均匀，在某些情况下，公布的模型之间存在差异。为了在结晶地壳中构建一致的三层三维地壳模型，我们避免了直接插值数据库中的地壳地震参数。相反，我们实现了以下步骤序列：北美主要构造省的几何学定义2. 地震地壳模型数据库可靠性的选择与评价3. 各构造省上、中、下地壳纵波速度及厚度估算4. 插值速度分布的估计。所得结晶地壳的平均速度与地震点的平均速度基本一致。模型显示的北美结晶壳结构的主要变化可能与其构造演化有关。该模型以数字形式提供，可用于各种地球物理应用，例如对重力和地震层析成像中的地壳效应进行校正，以及动态地形模型，以便探测底层上地幔的非均质性特征。
Based on the large number of crustal seismic experiments carried out in the last decades we create NACr14, a 3D crustal model of the North American continent at a resolution of 1° × 1°. We present maps of thickness and average velocities of the main layers that comprise the North American crystalline crust, obtained from the most recent seismic crustal models within the USGS crustal structure database. However, the crustal data are unevenly distributed and in some cases discrepancies exist between published models. In order to construct a consistent 3D crustal model with three layers in the crystalline crust, we refrained from a direct interpolation of the crustal seismic parameters in the database. Instead, we implemented the following sequence of steps: 1. Definition of the geometry of the main tectonic provinces of North America; 2. Selection and evaluation of the reliability of seismic crustal models in the database; 3. Estimation of theP-waveseismic velocity and thickness of the upper, middle and lower crust for each tectonic province; 4. Estimation of the interpolatedPnvelocity distribution. The resulting average velocity of the crystalline crust is mostly consistent with that of the seismic points. The main variations of the structure of the crystalline crust of North America displayed in the model can be related to its tectonic evolution. The model, available in a digital form, can be used in various geophysical applications, such as the correction for the crustal effects in gravity and seismic tomography and models of dynamic topography, in order to detect heterogeneities characterizing the underlying upper mantle.
影响因子：
5.3
作者：
D. Thompson;I. Bastow;G. Helffrich;J. Kendall;J. Wookey;D. Snyder;D. Eaton
通讯作者：
D. Thompson;I. Bastow;G. Helffrich;J. Kendall;J. Wookey;D. Snyder;D. Eaton