Modelling of ground motion amplification in a three-dimensional maar volcanic structure

0555631 - GFÚ 2022 JP eng C - Conference Paper (international conference)
Labuta, Martin - Burjánek, Jan
Modelling of ground motion amplification in a three-dimensional maar volcanic structure.
The 6th IASPEI / IAEE International Symposium: Effects of Surface Geology on Seismic Motion. Kyoto: Kyoto University, 2021, č. článku GS2-P03..
[IASPEI/IAEE International Symposium: The Effects of Surface Geology on Seismic Motion /6./. Kyoto (JP), 30.08.2021-02.09.2021]
R&D Projects: GA ČR(CZ) GA20-15818S
Grant - others:Ministerstvo školství, mládeže a tělovýchovy - GA MŠk(CZ) LM2018140
Institutional support: RVO:67985530
Keywords : ambient vibration * site effect * spectral analysis * 3D numerical modelling
OECD category: Volcanology

In this study, we determine properties of maar volcanic structure using synthetic ambient vibration analysis. Previously, we performed a number of ambient vibrations surveys at Mýtina maar (West-Bohemia, Czechia) in order to map amplification by site-to-reference spectral ratios and to estimate average shear wave velocities by array methods. As the maar diatreme is formed by deep concave body of broken rock, strong three-dimensional resonances develop. The amplification factors reach value of 20 in the central part of the maar. In order to understand these observations, we develop a simplified 3D velocity model and simulated synthetic ambient vibrations by finite difference method. The noise synthetics were processed in the same way as recorded dataand a comparison was made.
Permanent Link: http://hdl.handle.net/11104/0330114