Bulk, shear and scattering attenuation beneath Hawaiian Volcanos and in the oceanic crust extending to the Aloha Cabled Observatory

Bulk, shear and scattering attenuation beneath Hawaiian Volcanos and in the oceanic crust extending to the Aloha Cabled Observatory
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夏威夷火山下方和延伸至阿罗哈有线天文台的洋壳中的体积、切变和散射衰减

DOI:
10.1093/gji/ggaa309
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发表时间:
2020
影响因子:
2.8
通讯作者:
Butler, Rhett
Butler, Rhett
中科院分区:
地球科学2区
文献类型:
--
作者:
Butler, Rhett

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地震衰减是从2018年Kī劳厄火山发生的50次地震中测得的,这些地震与破火山口坍塌有关。导线以几乎恒定的方位延伸到毛纳罗亚和毛纳克亚之间的马鞍处,继续延伸到毛伊岛,在三座休眠火山的远侧下方。导线从毛伊岛向海延伸到奥胡岛以北海底的阿洛哈有线天文台(ACO)。有效衰减是根据震源模型测量的。并推导出与频率有关的参数。最初的路径是浅的和上坡的,通往毛伊岛的路径在地壳中部传播,而通往ACO的路径延伸穿过洋壳。每条导线上的观测值都被模拟为整体衰减。观察到了几个衰减过程,包括、常数Q和散射。体积衰减的观察归因于玄武岩和饱和水泡之间的物理性质的差异。利用地壳浅层和中层传播的Q值之比,推导出待定剪切衰减机制的活化能E*。中地壳路径的德拜弛豫峰与观测到的相吻合。之前在韦克岛附近的高频衰减研究与夏威夷的Q数据集相比很好,后者总体上显示Q值低于Wake观测到的Q值。
Seismic attenuation is measured from a swarm of 50 earthquakes in Kīlauea volcano in 2018, associated with caldera collapse. The traverse extends at nearly constant azimuth to the saddle between Mauna Loa and Mauna Kea, continuing to Maui beneath the distal flanks of three dormant volcanos. From Maui the traverse then extends seaward to the Aloha Cabled Observatory (ACO) on the seafloor north of O‘ahu. The effective attenuation is measured with respect to anearthquake source model. Frequency dependentandare derived. The initial path is shallow and uphill, the path to Maui propagates at mid-crustal depths, and the path to ACO extends through oceanic crust. The observations ofover each traverse are modelled as bulk attenuation. Several attenuation processes are observed, including,,, constantQand scattering. The observation of bulk attenuation is ascribed to contrasting physical properties between basalt and water saturated vesicles. The ratio ofQvalues between shallow and mid-crustal propagation is used to derive an activation energyE*for the undetermined shear attenuation mechanism. A Debye relaxation peak is fit to theandobserved for the mid-crustal pathway. A prior high-frequency attenuation study near Wake Island compares well with this HawaiianQdata set, which in general shows lower values ofQthan observed for Wake.
DOI: 10.1111/j.1365-246x.1991.tb05700.x
发表时间: 2007-04
影响因子: 2.8
作者:
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通讯作者: R. Widmer;G. Masters;F. Gilbert
DOI: 10.4294/jpe1952.35.111
发表时间: 1987
期刊: Journal of physics of the earth
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DOI: --
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DOI: --
发表时间: 2019
影响因子: 3.3
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DOI: --
发表时间: 2003
期刊:
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