根据当地地震层析成像推断帕拉穆希尔岛(千岛弧)埃贝科火山及周边地区地下的地震结构

IF 2.4 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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引用次数: 0

摘要

帕拉穆希尔岛是俄罗斯远东地区千岛弧最北端的一个大岛。在这里,我们研究的是帕拉穆希尔岛的北部地区,该地区以海拔约 1000 米的维尔纳茨基海脊为主。该海脊由一系列更新世和全新世火山组成,其中包括目前活跃的埃贝科火山,该火山喷发频繁,并有持续的炽热活动。研究北帕拉穆希尔火山下的内部结构对于了解埃贝科火山下岩浆、热液、水文和地质过程的相互关系非常重要。我们使用了由 20 个宽带台站组成的便携式网络的地震数据,其中 20 个台站在 2021 年夏季至 2022 年安装了一年,另一个永久性台站位于谢韦罗-库里尔斯克市。我们进行了当地地震层析反演,提供了帕拉穆希尔北部地区的 Vp、Vs、Vp/Vs 和当地地震度的分布,该地区横向范围为 20 千米,深度为 15 千米。多次测试结果提供了有关计算模型分辨率限制的信息,在解释模型时考虑了这些限制。在计算出的模型中,低 Vp、高 Vs、低 Vp/Vs 和埃贝科以下 10 千米的地震群同时存在,这表明存在一个大的气体饱和区域,该区域是由于液态流体与热岩浆侵入体接触而形成的。这一区域的西部边界与上尤里耶夫斯基(Verkhne-Yurievsky)热水源的位置相吻合,可能突出了流体在埃贝科下面的热体周围流动的路径。在东坡上部下方,我们观察到低 Vs 和高 Vp/Vs 的浅层异常,表明存在近地表含水层,证实了之前的环境噪声断层扫描结果。在东坡下部,一个近乎垂直的低 Vs 和高 Vp/Vs 异常点可能代表一个断层带,地表上也有一系列线状物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seismic structure beneath Ebeko Volcano and surrounding areas of Paramushir Island (Kuril Arc) inferred from local earthquake tomography
Paramushir is a large northernmost island of the Kuril Arc in the Russian Far East. Here, we study the northern part of Paramushir, which is dominated by the Vernadsky Ridge with an altitude of around 1000 m above sea level. This ridge is composed of a series of Pleistocene and Holocene volcanoes and includes the presently active Ebeko Volcano, which exhibits frequent phreatomagmatic eruptions and ongoing fumarolic activity. Studying the internal structure beneath Northern Paramushir is important to understand the interrelationship of magmatic, hydrothermal, hydrological and geological processes below Ebeko Volcano. We use seismic data of a portable network consisting of 20 broadband stations installed for one year from the summer 2021 to 2022 and one permanent station in the city of Severo-Kurilsk. We performed the local earthquake tomography inversion, which provided the distributions of Vp, Vs, Vp/Vs and local seismicity in an area of northern Paramushir with lateral extent of ∼20 km and depth of a ∼ 15 km. The results of several tests gave the information about the resolution limitations of the computed model, which were taken into account during its interpretation. In the resulting model, the coexistence of low Vp, high Vs, low Vp/Vs and a seismicity cluster down to ∼10 km below Ebeko indicates the presence of a large gas-saturated area that was formed due to the contacts of liquid fluids with hot magmatic intrusions. The western border of this area coincides with the location of Verkhne-Yurievsky hot water sources and possibly highlights the path of fluids traveling around the hot body below Ebeko. Below the upper part of the eastern slope, we observe a shallow anomaly of low Vs and high Vp/Vs indicating the presence of a near-surface aquifer, confirming the previous results of ambient noise tomography. Below the lower part of the eastern slope, a nearly vertical anomaly of low Vs and high Vp/Vs may represent a fault zone, which is also marked on the surface by a series of lineaments.
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来源期刊
CiteScore
5.90
自引率
13.80%
发文量
183
审稿时长
19.7 weeks
期刊介绍: An international research journal with focus on volcanic and geothermal processes and their impact on the environment and society. Submission of papers covering the following aspects of volcanology and geothermal research are encouraged: (1) Geological aspects of volcanic systems: volcano stratigraphy, structure and tectonic influence; eruptive history; evolution of volcanic landforms; eruption style and progress; dispersal patterns of lava and ash; analysis of real-time eruption observations. (2) Geochemical and petrological aspects of volcanic rocks: magma genesis and evolution; crystallization; volatile compositions, solubility, and degassing; volcanic petrography and textural analysis. (3) Hydrology, geochemistry and measurement of volcanic and hydrothermal fluids: volcanic gas emissions; fumaroles and springs; crater lakes; hydrothermal mineralization. (4) Geophysical aspects of volcanic systems: physical properties of volcanic rocks and magmas; heat flow studies; volcano seismology, geodesy and remote sensing. (5) Computational modeling and experimental simulation of magmatic and hydrothermal processes: eruption dynamics; magma transport and storage; plume dynamics and ash dispersal; lava flow dynamics; hydrothermal fluid flow; thermodynamics of aqueous fluids and melts. (6) Volcano hazard and risk research: hazard zonation methodology, development of forecasting tools; assessment techniques for vulnerability and impact.
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