Identification of iceberg-forming ice quakes from seismic and infrasound data

• Published in: Ice and Snow
• Main Authors: Yu. Vinogradov A., A. Fedorov V., S. Baranov V., V. Asming E., I. Fedorov S., Ю. Виноградов А., А. Федоров В., С. Баранов В., В. Асминг Э., И. Федоров С.
• Other Authors: The work was supported by Ministry of Science and Higher Education of the Russian Federation (№ 075-01304-20). The data used in the work were obtained with large-scale research facilities «Seismic infrasound array for monitoring Arctic cryolitozone and continuous seismic monitoring of the Russian Federation, neighbouring territories and the world» (https://ckp-rf.ru/usu/507436/)., Работа выполнена при поддержке Минобрнауки России (в рамках государственного задания № 075-01304-20) и с использованием данных, полученных на уникальной научной установке «Сейсмоинфразвуковой комплекс мониторинга арктической криолитозоны и комплекс непрерывного сейсмического мониторинга Российской Федерации, сопредельных территорий и мира» (https://ckp-rf.ru/usu/507436/).
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: IGRAS 2021
• Subjects: iceberg formation;Svalbard Archipelago;calving;glacier;ice quake;video recording;infrasound monitoring;seismic monitoring; айсбергообразование;архипелаг Шпицберген;калвинг;ледник;льдотрясение;видеорегистрация;инфразвуковой мониторинг;сейсмический мониторинг; Arctic; Svalbard; Svalbard Archipelago; Nordenskiold Glacier; Annals of Glaciology; glacier; Iceberg*; The Cryosphere
• Online Access: https://ice-snow.igras.ru/jour/article/view/894; https://doi.org/10.31857/S2076673421020087

The application of a joint method of recording seismic and infrasound signals generated during ice calving from the terminal part of the outlet glaciers to identify the process of iceberg formation is considered. For many years, the Kola Branch of the Geophysical Service of the Russian Academy of Sciences has been developing technology for remote monitoring of the processes of destruction of ice sheets in the Arctic. To improve the methodology of geophysical monitoring of processes of the iceberg calving in the Arctic seas in the Svalbard archipelago, the experiment was conducted for the first time on the complex recording of the destruction of the Nordenskiold glacier using seismometers, infrasound microphones and video cameras. The aim of the experiment was to obtain time-synchronized recordings of seismic, infrasound and video signals produced by calving of the glacier edge. The synchronized recordings obtained as a result of the experiment were used to identify specific attributes that characterize the recordings of iceberg-inducing ice quakes. Results of the experiment showed that the calving events that produce floating icebergs generate seismic and infrasonic signals of a special spectral composition and are characterized by the presence of pronounced bands in the spectral-time representation. The revealed characteristic is a distinguishing evidence of a calving event with the iceberg-inducing potential from other types of ice quakes, such as cracking and movement of the glacier body. The experimental results obtained may be used for development of a system for seismic-infrasound monitoring of processes of the iceberg formation. Рассматриваются результаты эксперимента по комплексной регистрации процессов деструкции ледника Норденшельда (архипелаг Шпицберген) при помощи сейсмометров, инфразвуковых датчиков и видеокамер. Задачи эксперимента заключаются в регистрации синхронизированных по времени сейсмических, инфразвуковых сигналов и видеозаписей, генерируемых обрушением края ледника, выявлении ...