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)

• Published in: Geodinamika i tektonofizika Vol. 13; no. 3
• Main Authors: Kholmogorov, A. O., Syrbu, N. S., Shakirov, R. B.
• Format: Journal Article
• Language: English
• Published: Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust 21-09-2022
• Subjects: earthquake; marginal seas; methane; sea of japan; transition zone
• ISSN: 2078-502X; 2078-502X
• DOI: 10.5800/GT-2022-13-3-0642

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).