Abstract

The paper presents the results of tiltmeter observations on the Kamchatka Peninsula in 2012–2016. Of the six tiltmeter stations operating in this period, two were successful, located in the area of the Klyuchevskaya volcano group, where tiltmeters were installed taking into account the technical requirements. During the period under consideration, two significant geodynamic events occurred on the Kamchatka Peninsula: the Sea of Okhotsk earthquake with M_W = 8.3 and a source depth of 630 km; the Tolbachik Fissure eruption, named after the 50th anniversary of the Institute of Volcanology (TFE-50). The simultaneous occurrence of an anomaly, which can be regarded as a precursor, in the behavior of the tilts at two points, as well as activation of a remote foreshock in Avacha Bay, indicate a single geodynamic process on a regional scale preceding the Sea of Okhotsk earthquake. At the point closest to the TFE-50 eruption (distance about 40 km), the N–S component shows a well-pronounced anomaly that began 5 months prior to the eruption, with a positive tilt of ~70 µrad. This indicates the complex geodynamic processes occurring before the TFE-50 eruption, caused by magma migration in layers with neutral buoyancy according to the geophysical model of the magma feeder system of the Klyuchevskaya volcano group. The obtained tilt data indicate that they can be a very significant supplement to the modern method of observing movements of the Earth’s surface using GPS technology.

中文翻译：

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2012-2016 年堪察加半岛倾斜观测

摘要

本文介绍了 2012-2016 年堪察加半岛倾斜仪观测的结果。在此期间运行的六个倾斜仪站中，有两个是成功的，位于 Klyuchevskaya 火山群区域，考虑到技术要求安装了倾斜仪。在审议期间，堪察加半岛发生了两个重大的地球动力学事件：鄂霍次克海地震，M _W= 8.3，震源深度 630 公里；Tolbachik 裂缝喷发，以火山学研究所 (TFE-50) 成立 50 周年而命名。在两个点的倾斜行为中同时发生的异常现象可以被视为前兆，以及在阿瓦查湾的远程前震的激活，表明在阿瓦查海之前的区域尺度上发生了单一的地球动力学过程。鄂霍次克地震。在最接近 TFE-50 喷发的点（距离约 40 公里），N-S 分量显示了一个明显的异常，它在喷发前 5 个月开始，正倾斜约为 70 µrad。这表明在 TFE-50 喷发之前发生了复杂的地球动力学过程，根据 Klyuchevskaya 火山群岩浆馈送系统的地球物理模型，由岩浆在具有中性浮力的层中迁移引起的。获得的倾斜数据表明，它们可以是对使用 GPS 技术观察地球表面运动的现代方法的非常重要的补充。