Two‐dimensional seismic attenuation images of Stromboli Island using active data
Two‐dimensional seismic attenuation images of Stromboli Island using active data
复制标题
使用活动数据绘制的斯特龙博利岛二维地震衰减图像
DOI：
10.1002/2015gl063293
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发表时间：
2015
影响因子：
5.2
通讯作者：
D. Patanè
中科院分区：
文献类型：
--
作者：
J. Prudencio;E. Del Pezzo;J. Ibáñez;E. Giampiccolo;D. Patanè
在这项工作中，我们展示了斯特龙博利火山的固有和散射地震衰减二维图像。我们使用了海洋考察船发射的气枪发射的 21,953 个波形，并在 33 个内陆地震台和 10 个海底地震台进行了记录。将滤波后的地震道的尾波包络拟合到扩散近似中的能量传输方程，获得六个频带中的一对单独的 Qi 和 Qs。使用尾波的数值估计灵敏度内核，生成每个质量因子的单独图像。结果看起来稳定且稳健。他们表明散射衰减优于固有衰减。散射图案显示出与该区域的构造轮廓非常一致，而高总衰减的区域与大多数火山活动发生的区域一致。我们的结果提供的证据表明，火山地区最重要的衰减效应与地质异质性的存在有关。
In this work we present intrinsic and scattering seismic attenuation 2‐D images of Stromboli Volcano. We used 21,953 waveforms from air gun shots fired by an oceanographic vessel and recorded at 33 inland and 10 ocean bottom seismometer seismic stations. Coda wave envelopes of the filtered seismic traces were fitted to the energy transport equation in the diffusion approximation, obtaining a couple of separate Qi and Qs in six frequency bands. Using numerically estimated sensitivity kernels for coda waves, separate images of each quality factor were produced. Results appear stable and robust. They show that scattering attenuation prevails over intrinsic attenuation. The scattering pattern shows a strong concordance with the tectonic lineaments in the area, while an area of high total attenuation coincides with the zone where most of the volcanic activity occurs. Our results provide evidence that the most important attenuation effects in volcanic areas are associated with the presence of geological heterogeneities.