2021年5月22日刚果民主共和国尼拉贡戈火山喷发前地震活动记录分析

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Journal of Volcanology and Seismology Pub Date : 2023-06-23 DOI:10.1134/S0742046323700136
A. T. Sadiki, A. M. Kyambikwa, D. B. Namogo, L. N. Diomi, O. M. Munguiko, G. M. Balezi, L. L. Sifa, S. M. Nzamu, N. Mashagiro, C. M. Balagizi, G. T. Mavonga
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引用次数: 1

摘要

本文概述了2021年5月22日尼拉贡戈火山喷发的不同地震前兆,并对喷发前记录的地震群进行了统计分析。对尼拉贡戈火山喷发前地震活动的分析表明,在2021年5月喷发前约一个月记录的长周期地震群中,存在由混合和/或火山构造型事件组成的特殊地震活动。2016年2月,在尼拉贡戈火山观察到类似的地震活动,导致2016年2月29日尼拉贡戈主火山口内的一个新喷口开放,并一直活跃到2021年5月喷发。在2016年1月至2021年5月期间,Rusayo和Kibati站的真实地震振幅测量表明,熔岩湖保持非常活跃,波动明显。由于熔岩湖已经达到较高的临界水平,熔岩湖的增加和稳定导致火山侧翼应力的增加和积累。无论是在2016年1月,2016年11月还是2021年4月,我们都表明,在尼拉贡戈火山群中记录的这种特殊类型的所谓混合地震事件可能导致主火山口内(2016年2月)或侧翼喷发(2021年5月)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Analysis of the Seismicity Recorded before the May 22, 2021 Eruption of Nyiragongo Volcano, Democratic Republic of the Congo

We present an overview of the different seismic precursors of the Nyiragongo volcano eruption on May 22, 2021, as well as a statistical analysis of the seismic swarms recorded during the pre-eruptive period. The analysis of the seismic activity of Nyiragongo volcano during the pre-eruptive period shows that there was a particular seismicity composed of hybrid and/or volcano-tectonic type events that characterized the long-period seismic swarm recorded about a month before the May 2021 eruption. In February 2016, similar seismic activity was observed at Nyiragongo volcano, which led to the opening of a new vent within Nyiragongo's main crater on February 29, 2016, and which remained active until the May 2021 eruption. During the period from January 2016 to May 2021, the lava lake remained very active with significant fluctuation as evidenced by the Real Seismic Amplitude measurement at Rusayo and Kibati stations. The increase and stabilization of the lava lake to a higher level resulted in an increase and accumulation of stress on the flanks of the volcano since the lava lake had already reached a higher critical level. Whether in January 2016, November 2016 or April 2021, we show that this particular type of so-called hybrid seismic events recorded during a swarm at Nyiragongo volcano could lead to an eruption either inside the main crater (February 2016) or on the flanks in May 2021.

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来源期刊
Journal of Volcanology and Seismology
Journal of Volcanology and Seismology 地学-地球化学与地球物理
CiteScore
1.50
自引率
28.60%
发文量
27
审稿时长
>12 weeks
期刊介绍: Journal of Volcanology and Seismology publishes theoretical and experimental studies, communications, and reports on volcanic, seismic, geodynamic, and magmatic processes occurring in the areas of island arcs and other active regions of the Earth. In particular, the journal looks at present-day land and submarine volcanic activity; Neogene–Quaternary volcanism; mechanisms of plutonic activity; the geochemistry of volcanic and postvolcanic processes; geothermal systems in volcanic regions; and seismological monitoring. In addition, the journal surveys earthquakes, volcanic eruptions, and techniques for predicting them.
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