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首页> 外文期刊>International Journal of Geophysics >A Constrained 3D Density Model of the Upper Crust from Gravity Data Interpretation for Central Costa Rica
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A Constrained 3D Density Model of the Upper Crust from Gravity Data Interpretation for Central Costa Rica

机译：哥斯达黎加中部重力数据解释的上地壳约束3D密度模型

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The map of complete Bouguer anomaly of Costa Rica shows an elongated NW-SE trending gravity low in the central region. This gravity low coincides with the geographical region known as the Cordillera Volcánica Central. It is built by geologic and morpho-tectonic units which consist of Quaternary volcanic edifices. For quantitative interpretation of the sources of the anomaly and the characterization of fluid pathways and reservoirs of arc magmatism, a constrained 3D density model of the upper crust was designed by means of forward modeling. The density model is constrained by simplified surface geology, previously published seismic tomography and P-wave velocity models, which stem from wide-angle refraction seismic, as well as results from methods of direct interpretation of the gravity field obtained for this work. The model takes into account the effects and influence of subduction-related Neogene through Quaternary arc magmatism on the upper crust.
机译：哥斯达黎加的完整布格异常地图显示，中部地区拉长的NW-SE趋势重力偏低。重力低点与被称为科尔迪卡中央山脉的地理区域相吻合。它由地质和地貌构造单元组成，这些单元由第四纪火山岩组成。为了定量解释异常源以及弧状岩浆作用的流体通道和储层的特征，通过正演建模设计了一个约束的上地壳3D密度模型。密度模型受到简化的表面地质，先前发表的地震层析成像和P波速度模型的约束，这些模型源于广角折射地震，以及直接解释为此工作获得的重力场的方法的结果。该模型考虑了与俯冲有关的新近纪通过第四纪弧岩浆作用对上地壳的影响和影响。

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