STUDY OF METHANE CONCENTRATION VARIABILITY IN THE SURFACE LAYER OF THE SEA OF JAPAN IN THE CONTEXT OF SEISMIC EVENTS (BASED ON THE RESULTS OF EXPEDITION STUDIES IN 2017-2018)

被引：2

作者：

Kholmogorov, A. O. ^{[1
]}

Syrbu, N. S. ^{[1
]}

Shakirov, R. B. ^{[1
]}

机构：

[1] Russian Acad Sci, Ilichev Pacific Oceanol Inst, Far Eastern Branch, 43 Baltiyskaya St, Vladivostok 690041, Russia

来源：

GEODYNAMICS & TECTONOPHYSICS | 2022年 / 13卷 / 03期

关键词：

methane; earthquake; Sea of Japan; transition zone; marginal seas;

D O I：

10.5800/GT-2022-13-3-0642

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

A spatial distribution of methane dissolved in sea water is a critical but poorly understood factor in the context of seismic activity. Based on the results of the RV AKADEMIK OPARIN integrated geological-geophysical expedition (September 21 - October 31, 2017), this paper deals with the regularities of methane concentration variability in the surface layer of the Sea of Japan: the average growth and the average growth period were 70 % and 10 h, respectively, after each earthquake whereas a decrease in methane concentration in the sea water was 10-30 % 2-4 h before a seismic event. A decrease in methane concentration occurs irrespectively of the depth of an earthquake. The results obtained show good agreement with the published data and gaseous-geochemical monitoring materials, thus making it possible to associate seismic-related gaseous-geochemical regime not only with gas-saturated sediments but also with the water column of the Japan Basin (Sea of Japan).

引用

页数：16