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Modelling Gravity changes and crustal deformation in active volcanic areas

机译：模拟活动火山区的重力变化和地壳变形

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摘要

Elastic half-space models are widely used to interpret displacements and gravity changes in active vol-canic areas. Those models usually compute the displacement response to dilatational sources that sim-ulate a change in pressure of the magma chamber. However, elastic-gravitational model allows one to compute gravity, deformation and potential changes due to pressurized cavities and intruded masses together. First, we interpret deformation and gravity change data in Long Valley caldera, California, by using both a classical elastic and an elastic-gravitational model. Our results show that intruded mass can not be neglected for interpretation of gravity changes while displacements are mainly caused by pres-surization. Therefore, the intrusion mass together with the associated pressurization produces distinc-tive changes in gravity that could be used to interpret gravity changes without ground deformation or viceversa depending on what is the source playing the main role in modelling. Second, we model the source of inflation at Long Valley caldera using a Genetic Algorithm inversion technique and micro-gravity data (1982-1998). The results of the performed inversions fit gravity anomaly centered under the resurgent dome. The two source inversion suggest that the gravity change could be caused by a more spatially distributed source under the resurgent dome.
机译：弹性半空间模型被广泛用于解释活跃火山区的位移和重力变化。这些模型通常计算对膨胀源的位移响应，以模拟岩浆腔压力的变化。但是，弹性引力模型允许人们计算由于压力腔和侵入质量共同引起的重力，变形和电势变化。首先，我们通过使用经典弹性模型和弹性重力模型来解释加利福尼亚州长谷火山口的变形和重力变化数据。我们的研究结果表明，在解释重力变化时不能忽略侵入质量，而位移主要是由预应力引起的。因此，侵入物和相关的压力会产生引力的显着变化，这可以用来解释引力变化而无地面变形，反之亦然，这取决于在建模中起主要作用的来源。其次，我们使用遗传算法反演技术和微重力数据（1982-1998年）对长谷火山口的通货膨胀源进行建模。进行反演的结果与重生异常集中在中空穹顶下方。这两个震源的反演表明，重力变化可能是由复苏穹顶下空间分布更广的震源引起的。

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