The Nature of Deformations of the Western Slope of Shiveluch Volcano after the Eruption on April 11, 2023, Identified by SAR Interferometry

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Doklady Earth Sciences Pub Date : 2024-08-11 DOI:10.1134/s1028334x24602694

M. S. Volkova, V. O. Mikhailov, N. V. Gorbach

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Abstract

Using the images of the Sentinel-1A satellite, taken from May 1 to September 22, 2023, and the differential interferometry method (DInSAR) we calculated successive displacement fields in time, which clearly show a dome-shaped uplift on the western slope of Shiveluch volcano, 8‒8.5 km west of its active crater. The uplift grew especially intensely at the satellite acquisition intervals of May 1‒13, 2023; May 13‒25, 2023; and May 25‒June 6, 2023. To confirm the hypothesis on the formation of the displacement region due to magma intrusion beneath the western slope of the volcano, numerical modeling was carried out and the parameters of the sill-like magma body, which forms the displacements on the surface that best match the displacement observed from satellite radar interferometry data, were determined. It is assumed that, after the eruption on April 11, 2023, magma rose from a depth of 20‒25 km through a fissure formed under the western slope of the volcano and intruded horizontally beneath the slope at a depth of 1‒2 km in the north-northwesterly direction. Within the precision of data on slope displacements, the size of the magma body varies from 6.0 × 3.0 km at 1 km depth to 5.25 × 1.4 km at 2 km depth, while its height ranges from 0.5 to 1.75 m and its volume, from 0.009 to 0.0129 km³. Thus, based on radar interferometry data together with the data on the distribution of seismic activity accompanying the movement of magma, the model of the magma body that intruded beneath the western slope of Shiveluch volcano in the postparoxysmal phase of the eruption on April 11, 2023, was constructed. The formation of a new extrusive dome on the western slope of Shiveluch volcano at the end of April 2024 confirms the hypothesis about the intrusion of magmatic material beneath the western slope of the volcano and allows estimating the rate of magma rise to the surface.

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用合成孔径雷达干涉测量法识别的 2023 年 4 月 11 日希韦卢奇火山喷发后西坡变形的性质

摘要利用哨兵-1A 卫星于 2023 年 5 月 1 日至 9 月 22 日拍摄的图像和差分干涉测量法（DInSAR），我们计算了连续的时间位移场，清楚地显示了希维鲁奇火山西坡（其活火山以西 8-8.5 公里处）的圆顶状隆起。在 2023 年 5 月 1 日至 13 日、2023 年 5 月 13 日至 25 日以及 2023 年 5 月 25 日至 6 月 6 日的卫星采集时间间隔内，隆起尤为剧烈。为了证实火山西坡下岩浆侵入形成位移区的假设，进行了数值建模，并确定了淤泥状岩浆体的参数，该岩浆体在地表形成的位移与卫星雷达干涉测量数据观测到的位移最为吻合。假定 2023 年 4 月 11 日火山爆发后，岩浆从 20-25 千米深处通过火山西坡下形成的裂缝上升，沿西北偏北方向水平侵入坡下 1-2 千米深处。在斜坡位移数据的精度范围内，岩浆体的大小从 1 千米深的 6.0 × 3.0 千米到 2 千米深的 5.25 × 1.4 千米不等，高度从 0.5 米到 1.75 米不等，体积从 0.009 到 0.0129 千立方米不等。因此，根据雷达干涉测量数据以及伴随岩浆运动的地震活动分布数据，构建了 2023 年 4 月 11 日喷发后阵发性阶段侵入希维鲁奇火山西坡下的岩浆体模型。2024 年 4 月底，希维鲁赫火山西坡形成了一个新的喷出圆顶，这证实了关于岩浆物质侵入火山西坡下方的假设，并可估算岩浆上升到地表的速度。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.