Monitoring seismic velocity changes at Campi Flegrei (Italy) using seismic noise interferometry

IF 2.4 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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引用次数: 0

Abstract

Campi Flegrei is a volcanic field located west of Naples (Italy) in a densely populated area. Since 2005, its ground has been rising steadily due to the accumulation of fluids at shallow depths. The inflation of volcanic edifices is a possible precursor of an impending eruption. The uplift is accompanied by increasing seismic activity. This raises concerns about the possibility that the volcano may be on the verge of an eruption. To track the fluid movement, it is possible to monitor subtle changes of velocities of seismic waves by exploring ambient seismic noise. By examining different frequency bands, we can observe velocity changes at different depths. We interpret these changes as a monitoring of depth-dependent deformation in addition to the standard monitoring of surface deformation. We observe a velocity decrease in the long-term trend, presumably due to the extension of the hydrothermal system at shallow depths. To explain the long-term changes, we model a spherical pressure source to simulate volumetric strain changes induced by recent fluid activity. The model explains both, surface and subsurface deformation which leads to the opening of microcracks and pores, resulting in the observed velocity decrease. The short-term velocity changes are mainly driven by temperature or groundwater level changes. Once velocity changes are corrected for seasonal effects, remaining short term velocity changes can be associated with volcanic activity and earthquake swarms.
利用地震噪声干涉测量法监测坎皮弗莱格雷(意大利)的地震速度变化
坎皮弗莱格雷(Campi Flegrei)是位于意大利那不勒斯以西人口稠密地区的一个火山区。自 2005 年以来,由于浅层液体的积累,其地面一直在稳步上升。火山建筑物的膨胀可能是火山即将喷发的前兆。在隆起的同时,地震活动也在加剧。这让人担心火山可能即将喷发。为了跟踪流体运动,可以通过探索环境地震噪声来监测地震波速度的微妙变化。通过研究不同的频带,我们可以观察到不同深度的速度变化。除了标准的地表变形监测外,我们还将这些变化解释为对深度变形的监测。我们观察到长期趋势中的速度下降,这可能是由于热液系统在浅层的延伸。为了解释这种长期变化,我们建立了一个球形压力源模型,以模拟近期流体活动引起的体积应变变化。该模型同时解释了地表和地下变形,这些变形导致微裂缝和孔隙打开,从而导致观测到的速度下降。短期速度变化主要是由温度或地下水位变化引起的。在对速度变化进行季节影响校正后,剩余的短期速度变化可能与火山活动和地震群有关。
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来源期刊
CiteScore
5.90
自引率
13.80%
发文量
183
审稿时长
19.7 weeks
期刊介绍: An international research journal with focus on volcanic and geothermal processes and their impact on the environment and society. Submission of papers covering the following aspects of volcanology and geothermal research are encouraged: (1) Geological aspects of volcanic systems: volcano stratigraphy, structure and tectonic influence; eruptive history; evolution of volcanic landforms; eruption style and progress; dispersal patterns of lava and ash; analysis of real-time eruption observations. (2) Geochemical and petrological aspects of volcanic rocks: magma genesis and evolution; crystallization; volatile compositions, solubility, and degassing; volcanic petrography and textural analysis. (3) Hydrology, geochemistry and measurement of volcanic and hydrothermal fluids: volcanic gas emissions; fumaroles and springs; crater lakes; hydrothermal mineralization. (4) Geophysical aspects of volcanic systems: physical properties of volcanic rocks and magmas; heat flow studies; volcano seismology, geodesy and remote sensing. (5) Computational modeling and experimental simulation of magmatic and hydrothermal processes: eruption dynamics; magma transport and storage; plume dynamics and ash dispersal; lava flow dynamics; hydrothermal fluid flow; thermodynamics of aqueous fluids and melts. (6) Volcano hazard and risk research: hazard zonation methodology, development of forecasting tools; assessment techniques for vulnerability and impact.
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