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首页> 外文期刊>Pure and Applied Geophysics >Gravity Changes and Internal Processes: Some Results Obtained from Observations at Three Volcanoes
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Gravity Changes and Internal Processes: Some Results Obtained from Observations at Three Volcanoes

机译：重力变化和内部过程：从三座火山的观测中获得的一些结果

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摘要

Temporal gravity changes provide information about mass and/or density variations within and below the volcano edifice. Three active volcanoes have been under investigation; each of them related to a plate boundary: Mayon/Luzon/Philippines, Merapi/Java/Indonesia, and Galeras/Colombia. The observed gravity changes are smaller than previously expected but significant. For the three volcanoes under investigation, and within the observation period, mainly the increase of gravity is observed, ranging from 1,000 nm−2 to 1,600 nms−2. Unexpectedly, the gravity increase is confined to a rather small area with radii of 5 to 8 km around the summit. At Mayon and Merapi the parallel GPS measurements yield no significant elevation changes. This is crucial for the interpretation, as the internal pressure variations do not lead to significant deformation at the surface. Thus the classical Mogi-model for a shallow extending magma reservoir cannot apply. To confine the possible models, the attraction due to changes of groundwater level or soil moisture is estimated along the slope of Merapi exemplarily by 2-D modelling. Mass redistribution or density changes were evaluated within the vent as well as deeper fluid processes to explain the gravity variations; the results are compared to the model incorporating the additional effect of elastic deformation.
机译：时间重力变化提供有关火山建筑物内和火山质量以下的质量和/或密度变化的信息。三座活火山正在研究中。它们各自与板块边界有关：Mayon / Luzon /菲律宾，Merapi / Java /印度尼西亚和Galeras /哥伦比亚。观测到的重力变化小于以前的预期，但意义重大。对于正在调查的三个火山，在观测期内，主要观察到重力的增加，范围从1,000 nm-2 到1,600 nms-2 。出乎意料的是，重力增加被限制在山顶周围半径为5至8 km的较小区域内。在Mayon和Merapi，平行的GPS测量没有明显的海拔变化。这对于解释至关重要，因为内部压力的变化不会导致表面的明显变形。因此，浅层岩浆储层的经典莫吉模型无法应用。为了限制可能的模型，示例性地通过2-D建模沿着梅拉比的坡度估计由于地下水位或土壤水分的变化引起的吸引力。在排气口以及更深的流体过程中评估了质量的重新分布或密度变化，以解释重力变化。将结果与包含弹性变形附加影响的模型进行比较。

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