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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Magma Oscillations in a Conduit-Reservoir System, Application to Very Long Period (VLP) Seismicity at Basaltic Volcanoes: 2. Data Inversion and Interpretation at Klauea Volcano
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Magma Oscillations in a Conduit-Reservoir System, Application to Very Long Period (VLP) Seismicity at Basaltic Volcanoes: 2. Data Inversion and Interpretation at Klauea Volcano

机译：导管库系统中的岩浆振荡，应用于玄武岩火山的长期（VLP）地震性：2.克劳伊火山的数据反演和解释

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Very long period (VLP) seismic events (with dominant periods of 15 to 40 s), observed from 2007 to 2018 at the summit of Klauea Volcano, Hawai'i, arise from resonant oscillations in the shallow magma plumbing system. Utilizing an oscillation model developed in the companion paper (Liang et al., 2020), we perform Bayesian inversions on seismic data from four representative VLP events separately for the parameters of the shallow conduit-reservoir system, exploring both sphere and crack reservoir geometries. Both sphere and crack geometries are preferentially located similar to 1-2 km beneath the northeast edge of Halema'uma'u crater and produce similar fits to the data. Considering a reasonable range for reservoir storativity, magma density, and density contrast between the top and bottom of the conduit, we favor a spherical reservoir with a radius of 0.8 to 1.2 km and a short conduit of less than a few hundred meters. For this geometry, buoyancy from density stratification in the conduit provides the dominant restoring force for the VLP oscillation. Viscosity is constrained within an order of magnitude for each event (e.g., approximately 2 to 23 Pa s for one event versus 27 to 513 Pa s for another). Changes in VLP period T and quality factor Q can be explained by changes in viscosity, density stratification, and/or conduit/reservoir geometry. In particular, observed fluctuations in Q over short time intervals (e.g., hours) with minimal changes in T apparently require rapid changes of magma viscosity by over an order of magnitude, assuming geometry remains unchanged, possibly reflecting changes in volatile content, bubble concentration, or conduit flow regime.
机译：从2007年至2018年在Klauea火山，夏威夷夏威夷的峰会上观察到非常长的时期（VLP）地震事件（占主导地位为15至40秒），从浅岩浆管道系统中的共振振荡产生。利用在伴侣纸上开发的振荡模型（Liang等，2020），我们对浅导管 - 储层系统的参数分别地对来自四个代表VLP事件进行地震数据的贝叶斯逆转，探索了球体和裂缝水库几何形状。球体和裂缝几何形状优先位于Halema'ua'u火山口东北缘下方的1-2公里，并产生类似的符合数据。考虑到导管顶部和底部之间的储层储存性，岩浆密度和密度对比的合理范围，我们有利于半径为0.8至1.2公里的球形储存器，并且短导管小于几百米。对于这种几何形状，管道中的密度分层的浮力为VLP振荡提供了显性恢复力。对于每个事件的幅度（例如，对于另一个事件而言，对于另一个事件而言，对于另一个事件而言，粘度约为2至23Pa。可以通过粘度，密度分层和/或导管/或储存器几何形状的变化来解释VLP周期T和质量因子Q的变化。特别地，假设几何形状保持不变，可能反映挥发含量，气泡浓度的变化，在短的时间间隔（例如，T的短时间间隔（例如，几小时）的Q中的Q下的Q内的波动率显然需要快速变化。或导管流动制度。

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