Simultaneous infrasonic, seismic, magnetic and ionospheric observations in an earthquake epicentre

0348450 - ÚFA 2011 RIV GB eng J - Journal Article
Laštovička, Jan - Baše, Jiří - Hruška, František - Chum, Jaroslav - Šindelářová, Tereza - Horálek, Josef - Zedník, Jan - Krasnov, V.
Simultaneous infrasonic, seismic, magnetic and ionospheric observations in an earthquake epicentre.
Journal of Atmospheric and Solar-Terrestrial Physics. Roč. 72, č. 16 (2010), s. 1231-1240. ISSN 1364-6826. E-ISSN 1879-1824
R&D Projects: GA ČR GA205/07/1367
Institutional research plan: CEZ:AV0Z30420517; CEZ:AV0Z30120515
Keywords : Earthquake * Infrasonic effects * Ionospheric effects * Magnetic effects
Subject RIV: DG - Athmosphere Sciences, Meteorology
Impact factor: 1.579, year: 2010

We analyze the co-seismic effects of a relatively weak earthquake of 28 October 2008, which was a part of an earthquake swarm in the westernmost region of the Czech Republic. Special attention is paid to unique measurements of infrasonic phenomena. As far as we know, these have been the first infrasonic measurements during earthquake in the epicentre zone. Infrasonic oscillations (~1–12 Hz) in the epicentre region appear to be excited essentially by the vertical seismic oscillations. The observed oscillations are real epicentral infrasound not caused by seismic shaking of the instruments or by meteorological phenomena. Seismo-infrasonic oscillations observed 155 km apart from the epicentre were excited in situ by seismic waves. No earthquake-related infrasonic effects have been observed in the ionosphere. Necessity to make vibration tests of instruments is pointed out in order to be sure that observed effects are not effects of mechanical shaking of the instrument.
Permanent Link: http://hdl.handle.net/11104/0188986