Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 24527 10.12737/stp-44201810 Results of current research Results of current research Results of current research Generation of infrasonic signals during earthquakes under Lake Hovsgool (Northern Mongolia) on December 5, 2014 Generation of infrasonic signals during earthquakes under Lake Hovsgool (Northern Mongolia) on December 5, 2014 https://orcid.org/0000-0001-5446-9697 Сорокин Александр Григорьевич Sorokin Aleksandr Grigoryevich sor@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Ключевский Анатолий Васильевич Klyuchevskii Anatoliy Vasilyevich akluchev@crust.irk.ru Демьянович Владимир Михайлович Demyanovich Vladimir Mihaylovich vmdem@mail.ru Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation Институт земной коры СО РАН Иркутск Россия Institute of the Earth's Crust SB RAS Irkutsk Russian Federation Институт земной коры СО РАН Иркутск Россия Institute of the Earth's Crust SB RAS Irkutsk Russian Federation 4 4 73 81 https://zh-szf.ru/en/nauka/article/24527/view

The paper discusses the results of the detection of seismic and infrasonic waves generated by a major earthquake and its aftershock (the moment magnitude MW=4.9 and MW=4.2 respectively), which occurred in northern Mongolia under Lake Hovsgool on December 5, 2014. The joint analysis of waveforms of seismic and infrasonic oscillations has shown that the signal recorded by the infrasound station of the Geophysical Observatory of the Institute of Solar-Terrestrial Physics SB RAS (ISTP SB RAS) is formed from sources of three generation types: local, secondary, and epicentral. This analysis enables us to propose a hypothesis of generation of epicentral infrasonic signal by flexural waves in an elastic ice membrane on the surface of Lake Hovsgool, which appear during the passage of seismic wave packets. This hypothesis explains the similarity between seismic and epicentral infrasonic signals, negative initial phase of epicentral infrasonic waves, and detection of a weak signal after a small-magnitude aftershock.

The paper discusses the results of the detection of seismic and infrasonic waves generated by a major earthquake and its aftershock (the moment magnitude MW=4.9 and MW=4.2 respectively), which occurred in northern Mongolia under Lake Hovsgool on December 5, 2014. The joint analysis of waveforms of seismic and infrasonic oscillations has shown that the signal recorded by the infrasound station of the Geophysical Observatory of the Institute of Solar-Terrestrial Physics SB RAS (ISTP SB RAS) is formed from sources of three generation types: local, secondary, and epicentral. This analysis enables us to propose a hypothesis of generation of epicentral infrasonic signal by flexural waves in an elastic ice membrane on the surface of Lake Hovsgool, which appear during the passage of seismic wave packets. This hypothesis explains the similarity between seismic and epicentral infrasonic signals, negative initial phase of epicentral infrasonic waves, and detection of a weak signal after a small-magnitude aftershock.

 aftershock earthquake hypocenter seismic wave infrasonic wave flexural wave epicenter aftershock earthquake hypocenter seismic wave infrasonic wave flexural wave epicenter

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