Journal of Seismology

, Volume 22, Issue 2, pp 377–389 | Cite as

Hovsgol earthquake 5 December 2014, M W = 4.9: seismic and acoustic effects

  • Anna A. Dobrynina
  • Vladimir A. Sankov
  • Larisa R. Tcydypova
  • Victor I. German
  • Vladimir V. Chechelnitsky
  • Munkhuu Ulzibat


A moderate shallow earthquake occurred on 5 December 2014 (M W = 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). Source 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.


Infrasound signal Earthquake Surface waves Source parameters Focal mechanism Hovsgol 



We thank Dr. A. Sorokin for providing access to infrasound data and for a discussion of the work and also Dr. N. Perevalova for valuable constructive comments that helped to improve our paper. We are very grateful to our reviewer Dr. David N. Green for the valuable comments and suggestions that helped to improve our paper.


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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  1. 1.Institute of the Earth’s Crust of the Siberian Branch of the Russian Academy of ScienceIrkutskRussia
  2. 2.Geological Institute of the Siberian Branch of the Russian Academy of ScienceUlan-UdeRussia
  3. 3.Irkutsk State UniversityIrkutskRussia
  4. 4.Buryat Branch of Federal Research Center of Geophysical Survey of the Russian Academy of ScienceUlan-UdeRussia
  5. 5.Krasnoyarsk Research Institute of Geology and Mineral ResourcesKrasnoyarskRussia
  6. 6.Baikal Branch of Federal Research Center of the Geophysical Survey of the Russian Academy of ScienceIrkutskRussia
  7. 7.Institute of Astronomy and Geophysics of the Mongolian Academy of ScienceUlaanbaatarMongolia

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