Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.1007/s10950-017-9711-z

Ключевые слова: Earthquake, Focal mechanism, Hovsgol, Infrasound signal, Source parameters, Surface waves

Аннотация: A moderate shallow earthquake occurred on 5 December 2014 (MW = 4.9) in the north of Lake Hovsgol (northern Mongolia). The infrasonic signal with duration 140 s was recorded for this earthquake by the “Tory” infrasound array (Institute of Solar-Terrestrial Physics of the Siberian Branch of the Russian Academy of Science, Russia). SПоказать полностьюource parameters of the earthquake (seismic moment, geometrical sizes, displacement amplitudes in the focus) were determined using spectral analysis of direct body P and S waves. The spectral analysis of seismograms and amplitude variations of the surface waves allows to determine the effect of the propagation of the rupture in the earthquake focus, the azimuth of the rupture propagation direction and the velocity of displacement in the earthquake focus. The results of modelling of the surface displacements caused by the Hovsgol earthquake and high effective velocity of propagation of infrasound signal (~ 625 m/s) indicate that its occurrence is not caused by the downward movement of the Earth’s surface in the epicentral region but by the effect of the secondary source. The position of the secondary source of infrasound signal is defined on the northern slopes of the Khamar-Daban ridge according to the data on the azimuth and time of arrival of acoustic wave at the Tory station. The interaction of surface waves with the regional topography is proposed as the most probable mechanism of formation of the infrasound signal. © 2017 Springer Science+Business Media B.V.

Журнал: Journal of Seismology

Номера страниц: 1-13

ISSN журнала: 13834649

Издатель: Springer Netherlands

• Dobrynina A.A. (Institute of the Earth’s Crust of the Siberian Branch of the Russian Academy of Science, 128 Lermontov Street, Irkutsk, Russian Federation, Geological Institute of the Siberian Branch of the Russian Academy of Science, 6a Sakhyanova Street, Ulan-Ude, Russian Federation)
• Sankov V.A. (Institute of the Earth’s Crust of the Siberian Branch of the Russian Academy of Science, 128 Lermontov Street, Irkutsk, Russian Federation, Irkutsk State University, 134 Lermontov Street, Irkutsk, Russian Federation)
• Tcydypova L.R. (Geological Institute of the Siberian Branch of the Russian Academy of Science, 6a Sakhyanova Street, Ulan-Ude, Russian Federation, Buryat Branch of Federal Research Center of Geophysical Survey of the Russian Academy of Science, 6a Sakhyanova Street, Ulan-Ude, Russian Federation)
• German V.I. (Krasnoyarsk Research Institute of Geology and Mineral Resources, 55 Mira Av, Krasnoyarsk, Russian Federation)
• Chechelnitsky V.V. (Baikal Branch of Federal Research Center of the Geophysical Survey of the Russian Academy of Science, 128 Lermontov Street, Irkutsk, Russian Federation)
• Ulzibat M. (Institute of Astronomy and Geophysics of the Mongolian Academy of Science, P.O. Box-152, Ulaanbaatar, Mongolia)

• Scopus