Scholarlink

Abstract <p>We present the first results of instrumental observations of microbaric variations and variations in magnetic and electric fields in the surface atmosphere accompanying a strong (<i>M</i> = 8.8) Kamchatka earthquake on July&#xa0;29, 2025. The observational data indicate pronounced variations in the microbaric background both during the passage of seismic waves and during the arrival of an infrasound signal propagating through an atmospheric waveguide. The earthquake caused variations in the atmospheric electric field, significantly exceeding the background amplitude. At the same time, the seismic event was accompanied by a long-lasting variation of the magnetic field with an amplitude of up to ~50 nT at distances from ~1000 to ~10 000 km. The ionospheric effect is noted in the form of variations in the critical frequency of the F2 layer of the ionosphere. Taking into account the recurrence time of strong earthquakes in the region in question in recent years and the intensity of aftershock processes, it is concluded that the subduction process has intensified at the boundary of the Pacific and Okhotsk plates. The data indicate the influence of strong phenomena and processes occurring in the lithosphere on the atmosphere and ionosphere.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

First Results of Observations of the Geophysical Effects of the Strong (M = 8.8) Earthquake on July 29, 2025 in Kamchatka

  • 期刊论文

  • 发表日期：

    2025年12月1日

查看全文
  • V. V. Adushkin,
  • A. A. Spivak,
  • S. A. Riabova,
  • Yu. S. Rybnov,
  • S. P. Soloviev,
  • A. V. Tikhonova

摘要

Abstract

We present the first results of instrumental observations of microbaric variations and variations in magnetic and electric fields in the surface atmosphere accompanying a strong (M = 8.8) Kamchatka earthquake on July 29, 2025. The observational data indicate pronounced variations in the microbaric background both during the passage of seismic waves and during the arrival of an infrasound signal propagating through an atmospheric waveguide. The earthquake caused variations in the atmospheric electric field, significantly exceeding the background amplitude. At the same time, the seismic event was accompanied by a long-lasting variation of the magnetic field with an amplitude of up to ~50 nT at distances from ~1000 to ~10 000 km. The ionospheric effect is noted in the form of variations in the critical frequency of the F2 layer of the ionosphere. Taking into account the recurrence time of strong earthquakes in the region in question in recent years and the intensity of aftershock processes, it is concluded that the subduction process has intensified at the boundary of the Pacific and Okhotsk plates. The data indicate the influence of strong phenomena and processes occurring in the lithosphere on the atmosphere and ionosphere.