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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Seismic tomography of compressional wave attenuation structure for Klauea Volcano, Hawai'i
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Seismic tomography of compressional wave attenuation structure for Klauea Volcano, Hawai'i

机译：夏威夷克鲁伊亚火山压缩波衰减结构的地震层析成像

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摘要

We present a frequency-independent three-dimensional (3-D) compressional wave attenuation model (indicated by the reciprocal of quality factor Q(p)) for Klauea Volcano in Hawaii. We apply the simul2000 tomographic algorithm to the attenuation operator t(*) values for the inversion of Q(p) perturbations through a recent 3-D seismic velocity model and earthquake location catalog. The t(*) values are measured from amplitude spectra of 26708 P wave arrivals of 1036 events recorded by 61 seismic stations at the Hawaiian Volcanology Observatory. The 3-D Q(p) model has a uniform horizontal grid spacing of 3km, and the vertical node intervals range between 2 and 10km down to 35km depth. In general, the resolved Q(p) values increase with depth, and there is a correlation between seismic activity and low-Q(p) values. The area beneath the summit caldera is dominated by low-Q(p) anomalies throughout the entire resolved depth range. The Southwest Rift Zone and the East Rift Zone exhibit very high Q(p) values at about 9km depth, whereas the shallow depths are characterized with low-Q(p) anomalies comparable with those in the summit area. The seismic zones and fault systems generally display relatively high Q(p) values relative to the summit. The newly developed Q(p) model provides an important complement to the existing velocity models for exploring the magmatic system and evaluating and interpreting intrinsic physical properties of the rocks in the study area.
机译：我们提出了夏威夷克劳厄火山的频率独立的三维（3-D）压缩波衰减模型（由品质因数Q（p）的倒数表示）。我们将simul2000层析成像算法应用于衰减算子t（*）值，以通过最近的3-D地震速度模型和地震位置目录反演Q（p）扰动。 t（*）值是根据夏威夷火山天文台的61个地震台站记录的1036个事件的26708 P波到达的振幅谱测得的。 3-D Q（p）模型具有3km的均匀水平网格间距，并且垂直节点间距的范围在2到10km到35km的深度之间。通常，解析的Q（p）值随深度增加，并且地震活动与低Q（p）值之间存在相关性。在整个解析深度范围内，山顶火山口下方的区域均以低Q（p）异常为主。西南裂谷带和东裂谷带在约9 km深度处表现出很高的Q（p）值，而浅层深度的低Q（p）异常特征可与山峰地区相提并论。相对于山顶，地震带和断层系统通常显示出较高的Q（p）值。新开发的Q（p）模型为现有的速度模型提供了重要的补充，用于探索岩浆系统以及评估和解释研究区域岩石的固有物理特性。

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