利用 BBOBS 阵列数据精确确定海山附近的震中位置

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Volcanology and Geothermal Research Pub Date : 2024-09-04 DOI:10.1016/j.jvolgeores.2024.108186

Tetsuya Aoyama, Nozomu Takeuchi, Yosuke Aoki

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引用次数: 0

摘要

2006 年 10 月 23 日，位于伊豆-波宁-马里亚纳弧的星期一海山附近发生了一次 Mw = 6.4 的地震，可能与海底火山活动有关。尽管地震规模很大，但由于台站覆盖率低，穿越海洋岩石圈的波形复杂，常规数据处理无法准确定位余震。本研究利用方位角覆盖较好的宽带海底地震仪（BBOBS）阵列数据，并开发了检测 P 波到达时间的新方法来精确定位余震，从而克服了这些问题。大多数被重新定位的震中位于海山建筑物旁的裂谷区。我们将这种模式解释为堤坝侵入引起的应力扰动所诱发的地震活动。

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Accurate epicenter locations in the vicinity of the seamount by using BBOBS array data

A Mw = 6.4 earthquake, possibly related to submarine volcanism, occurred on October 23, 2006, in the vicinity of Monday Seamount, located in the Izu-Bonin-Mariana arc. Despite the size of the earthquake, the precise location of aftershocks is intractable with the routine data processing because of poor station coverage and complex waveforms traversing the oceanic lithosphere. This study overcomes these problems by using the Broadband Ocean Bottom Seismometer (BBOBS) array data with better azimuthal coverage and by developing new methods to detect the P-wave arrival time to locate the aftershocks precisely. Most of the relocated epicenters are located in the rift zone next to the edifice of the seamount. We interpret this pattern as the seismic activity induced by stress perturbation due to the dike intrusion.

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来源期刊

Journal of Volcanology and Geothermal Research 地学-地球科学综合

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.