О выделении айсбергообразующих льдотрясений по сейсмоинфразвуковым данным

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 характерных особенностей этих сигналов, а также проверке возможности применения метода совместного сейсмического и инфразвукового мониторинга для обнаружения случаев образования айсбергов. Анализ полученных данных показал, что калвинговые события, порождающие плавающие айсберги, генерируют сейсмические сигналы особого спектрального состава, которые характеризуются наличием ярко выраженных полос в спектрально-временнóй диаграмме

Seismological observations of glaciers dynamic on the Spitsbergen archipelago

The paper provides a brief description of results of Spitsbergen glacier observations by the seismic method. The study has been carried out both by permanent and temporary stations data. Characteristic features of glacier-related seismic events have been shown. Main areas of glacier seismic activity on the Archipelago have been revealed. A detailed study of Horsund-fjord glacier activity has been carried out using local seismic station HSPB data. Temporal and spatial distributions of glacier-related events have been obtained for the area. Season variations in temporal distribution of the events have been foun

The European Arctic Seismic Bulletin for the years 1990 – 2013

Recent years have shown an increased interest in Polar research and in particular in understanding tectonics and seismic hazard in the Arctic. To understand the seismic activity in the European Arctic, the seismic bulletins should be as complete as possible. We present a new seismic event bulletin for the European Arctic (70° – 90° N, -15° – 75° E), for the 24-year long period 1990 – 2013. The poster will show in detail the merging of the different sources taken in account for the compilation, the homogenization of the data and the relocation of the seismic events. With respect to the ISC bulletin for this region, the new bulletin contains 5,932 new seismic events and 54,630 new seismic onset readings from stations mostly located at regional distances. The gains are distributed over the entire study region, with the most significant contributions across the Svalbard Archipelago, along the Knipovich and northern Mohns Ridges, as well as northern Fennoscandia.Norwegian Research Council Grant 233973/H30Russian Foundation for Basic Research Grant 14-05-93080Russian Foundation for Basic Research Grant 18-05-70018https://doi.org/10.31905/TYLLQY8Tposte