STUDY OF SEISMIC EFFECTS ON CHANGES IN GROUNDWATER PRESSURE: EQUIPMENNT AND SOME WELL OBSERVASTION RESULTS FOR THE KAMCHATKA PENINSULA

• Published in: Journal of Volcanology and Geothermal Research
• Main Authors: S. V. Boldina, G. N. Kopylova, V. A. Kobzev, С. В. Болдина, Г. Н. Копылова, В. А. Кобзев
• Other Authors: The work was performed with the support from the Ministry of Science and Higher Education of the Russian Federation as part of the state assignment 075-00576-21 with the use of the data obtained from the Large-Scale Research Facilities "Seismic and infrasonic monitoring of the Arctic cryolite zone and continuous seismic monitoring of the Russian Federation, adjacent areas and the world"., Работа выполнена при поддержке Минобрнауки РФ врамках государственного задания № 075-00576-21 с использованием данных, полученных на уникальной научной установке «Сейсмоинфразвуковой комплекс мониторинга арктической криолитозоны и комплекс непрерывного сейсмического мониторинга Российской Федерации, сопредельных территорий и мира».
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch 2022
• Subjects: гидрогеодинамический предвестник; water level; groundwater pressure; earthquake; seismic waves; well equipment; hydrogeodynamic precursors; уровень воды; давление подземных вод; землетрясение; сейсмические волны; скважинное оборудование; Kamchatka; Kamchatka Peninsula; КАМЧАТК*
• Online Access: https://www.gt-crust.ru/jour/article/view/1435; https://doi.org/10.5800/GT-2022-13-2-0594

The relevance of the work is determined by the necessity to develop the hardware part of the seismic subsystem of the Large-Scale Research Facilities functioning at the Federal Research Center of the Geophysical Survey of the Russian Academy of Sciences to study seismic signals in groundwater pressure changes. For this purpose, the well monitoring on the territory of the Petropavlovsk-Kamchatsky test site, Kamchatka Peninsula, was updated using Keller equipment, Switzerland (sensors of PAA36 XiW CTD Si, PAA36 XiW modifications, data logger GSM-2), Campbell Scientific Inc, USA (CR6 and CR1000 data loggers) and a budgetary hydrogeodynamic data recorder (HDDR) based on the STK-1 minicomputers, created at the Kamchatka Branch of the GS RAS. A description has been provided concerning the sets of digital equipment installed in four wells for precise recording of groundwater pressure variations with a frequency of 20.00–0.08 Hz. Consideration is being given to the characteristics of the equipment installed in individual wells and to the problems solved in the process of updating the well observation system in order to study vibration effects and hydrogeodynamic precursors of earthquakes. The paper presents the newly obtained results of recording the high-frequency variations in groundwater pressure in wells during the 2020–2021 local and remote earthquakes. A discussion is provided of new possibilities for studying vibration effects on changes in ground water pressure with a frequency comparable to the frequency of recording seismic events by seismometric equipment. Using a new equipment for recording water pressure in the unique well E-1 made it possible to record, a hydrogeodynamic precursor in real time before the March 16, 2021, Mw=6.6 earthquake which occurred at the epicentral distance of 350 km from the well. Актуальность работы определяется необходимостью развития аппаратурной части сейсмической подсистемы уникальной научной установки, функционирующей в Федеральном исследовательском центре «Единая ...