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首页> 外文期刊>Journal of geodynamics >On the interpretation of vertical gravity gradients produced by magmatic intrusions
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On the interpretation of vertical gravity gradients produced by magmatic intrusions

机译：关于岩浆侵入产生的垂直重力梯度的解释

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摘要

A method for the computation and interpretation of gravity and height changes and vertical gravity gradients produced by magmatic intrusions in a layered elastic-gravitational medium is presented. The methodology assumes a planar medium geometry, which consists of welded layers overlying a half-space. The medium is elastic and gravitating. The intrusion is treated as a point source and can be located at any depth inside the medium. The theoretical elastic-gravitational model allows the computation of the so-called geometric and orthometric vertical displacements as well as gravity changes of different types. The corresponding vertical gravity gradients can also be computed. We present several examples of theoretical computations and study different types of these geometric and orthometric gravity gradients and the information we can get from the application of the methodology described. The results presented show that the use of these gradients is a useful tool to obtain information on the dynamics of the injection processes, including the detection of new magma recharge. We show that using the elastic-gravitational deformation model we can explain non-linear gravity-height relationships that appear in volcanic areas. We also present the application of the methodology to Mayon volcano, Philippines, delineating the intrusion of new magma, consistent with the produced eruptions after the observation period.
机译：提出了一种计算和解释重力和高度变化以及层状弹性引力介质中岩浆侵入产生的垂直重力梯度的方法。该方法假设一个平面介质几何形状，该几何形状由覆盖半空间的焊接层组成。介质具有弹性和吸引力。入侵被视为点源，可以位于介质内部的任何深度。理论上的弹性引力模型允许计算所谓的几何和正交垂向位移以及不同类型的重力变化。也可以计算相应的垂直重力梯度。我们提供了理论计算的几个示例，并研究了这些几何和正交重力梯度的不同类型，以及我们从所描述方法的应用中可以获得的信息。给出的结果表明，这些梯度的使用是获得有关注入过程动力学信息的有用工具，包括新岩浆充注的检测。我们表明，使用弹性引力变形模型可以解释火山区中出现的非线性重力-高度关系。我们还介绍了该方法在菲律宾马永火山中的应用，描绘了新岩浆的侵入，这与观测期后产生的喷发相一致。

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