Seismic Velocity Variations at Different Depths Reveal the Dynamic Evolution Associated With the 2018 Kilauea Eruption
Seismic Velocity Variations at Different Depths Reveal the Dynamic Evolution Associated With the 2018 Kilauea Eruption
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DOI：
10.1029/2021gl093691
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发表时间：
2022-01
影响因子：
5.2
通讯作者：
Zhiqiang Liu;C. Liang;Huixuan Huang;Chaoliang Wang;Feihuang Cao
中科院分区：
文献类型：
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作者：
Zhiqiang Liu;C. Liang;Huixuan Huang;Chaoliang Wang;Feihuang Cao
基于噪声的速度变化测量的进展揭示了火山喷发前的异常。然而，基于传统的尾波方法，很难将它们分配到一定的深度。在这里，我们使用火山地震(1-2.5 S)和海洋噪声(3和3.5 S)作为被动震源来计算与2018年基拉韦厄火山喷发相关的瑞雷波速度变化。我们的模拟表明，在共同喷发期间，东裂谷带下1-2公里处的速度至少下降了5%。在喷发前，我们观察到相同深度的速度下降了1%，而在0-1和2-8公里的深度，速度增加了0.2%-1%。结合微震、全球定位系统资料和数值模拟，我们的观察表明，岩浆侵入可以在1-2公里深打开岩浆堤坝，但在周围地区会产生较高的压应力(约3.6-14.4兆帕)。
Advances in noise‐based velocity change measurements have revealed anomalies before volcanic eruptions. Still, it is difficult to assign them to a certain depth based on the traditional coda wave method. Here we used volcanic tremor (1–2.5 s) and oceanic noise (3 and 3.5 s) as passive sources to calculate the Rayleigh wave velocity changes associated with the 2018 Kilauea eruption. Our simulation show that the velocity decreased at least by 5% at 1–2 km depth beneath the East Rift zone in the co‐eruption time. Before the eruption, we observed a decrease (1%) at the same depth, whereas, at the depths of 0–1 and 2–8 km, the velocity increased by 0.2%–1%. Combined with microearthquakes, The Global Positioning System data, and numerical simulation, our observations suggest that magma intrusion may open the magma dike at 1–2 km depth but induce higher compressive stress (about 3.6–14.4 MPa) in the surrounding areas.