Abstract
The Yuzhno-Sakhalinsk mud volcano is located in the southern part of the Sakhalin Island within the area of the Central Sakhalin fault, one of the largest disjunctive dislocations of the island. The volcano was monitored during field seasons in the period from 2005 to 2007, and data on flow rates, chemical and isotope compositions of gases, temperature and chemical composition of watermud mixture in the volcano’s blowouts were collected and analysed. During the observation period, seismic activity in the region under study was significantly variable in time and space. The monitoring results revealed «traces» of two earthquakes in the blowout activity of the Yuzhno-Sakhalinsk mud volcano – the Gornazavodsk earthquake, that took place on 17 (18) August 2006, and the Nevelsk earthquake of 2 August 2007. Based on results of our analyses of the field data and mathematical simulation data, it is possible to conclude that an additional inflow of «deep geofluids» could not have been a major trigger of the activity of the volcano after the earthquakes. In our opinion, all the observed anomalies may result from «water – rock – gas» interactions in the top part of the mud volcano’s feeder channel. A combination of water and gas flows in the volcano’s channel and silica-alumina rocks comprises a specific geochemical system that is sensitive to external (seismic) impacts. Therefore, comprehensive consideration of physical and chemical processes within fluid-dynamic systems is required for assurance of correct interpretation of empirical data.
Highlights
Аннотация: Проанализированы результаты мониторинга дебита, химического и изотопного состава свободных газов, температуры и элементного состава водогрязевой смеси в грифонах на ЮжноСахалинском грязевом вулкане
The YuzhnoSakhalinsk mud volcano is located in the southern part of the Sakhalin Island within the area of the Central Sakhalin fault, one of the largest disjunctive dislocations of the island
Based on results of our analyses of the field data and mathematical simulation data, it is possible to conclude that an additional inflow of «deep geofluids» could not have been a major trigger of the activity of the volcano after the earthquakes
Summary
Fluid dynamics processes at the Central Sakhalin fault. личной сейсмической активностью южной части о. Fluid dynamics processes at the Central Sakhalin fault. В результате нами установлены проявления Горноза водского землетрясения 17 (18) августа 2006 г. И Невельского землетрясения 2 августа 2007 г. В грифонной деятель ности ЮжноСахалинского грязевого вулкана. А также математического моделиро вания свидетельствуют о том, что дополнительный подток глубинных геофлюидов не мог быть основной причиной активизации вулкана после землетрясений. Весь комплекс наблюдаемых аномалий объясняется взаимодействием «вода–порода–газ» в верхней части подводящего канала грязевого вулкана. Потоки воды и газа в канале вулкана, а также вмещающие алюмосиликатные породы образуют специфическую геохимическую систему, которая является чувствительной к внешним (сейсмическим) воздействиям. Следовательно, для корректной интер претации эмпирических данных следует более полно учитывать физикохимические процессы, которые протекают внутри флюидодинамических систем.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
