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Title: NUMERICAL ALGORITHM FOR IDENTIFYING INHOMOGENEITIES IN COMPLICATED MEDIUM
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NUMERICAL ALGORITHM FOR IDENTIFYING INHOMOGENEITIES IN COMPLICATED MEDIUM
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1314-2704
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English
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21
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7.1
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• Prof. DSc. Oleksandr Trofymchuk, UKRAINE
• Prof. Dr. hab. oec. Baiba Rivza, LATVIA |
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An important problem in solving inverse problems in seismology associated with determining the characteristics of a seismic source is obtaining a priori information about the propagation velocities of seismic waves. Along with such factors as the of external noise levels, the geometry of arrangement of the receivers, the parameters of the Earth model, etc., the degree of completeness of information about the velocity characteristics of the medium determines the accuracy of the inverse problem solution. It is especially difficult to obtain such information in media with a pronounced heterogeneity of the structure. Such media include those in areas of volcanic edifices, including mud volcanoes. The main objective of this study is to specify the velocity characteristic of the medium using, as an example the volcanic zone of Mount Karabetova mud volcano (the Taman mud volcanic province). An approach to the calculation and estimation of local velocities of seismic P-waves in mud volcano area based on the grid method is proposed. The numerical algorithm is tested on experimentally obtained arrival times of waves from a vibration source of the SV-10/100 type for the Mount Karabetova mud volcano. Registration of signal was carried out by 35 autonomous stations with sounding from 5 vibrator locations in the frequency range of 10-60 Hz. The results of numerical modeling show that nonlinearity in the hodograph of seismic P-waves in the volcanic edifice area can be identified with 60x60 or more grid nodes, which corresponds to 31.2 m along the X-axis and 48.1 m along the Y-axis. The obtained results of the distribution of local velocities are consistent with the previously obtained geological structure of the study area and indicate higher velocities in the area of an anticlinal fold passing through the volcano zone.
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conference
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21st International Multidisciplinary Scientific GeoConference SGEM 2021
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21st International Multidisciplinary Scientific GeoConference SGEM 2021, 16 - 22 August, 2021
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Proceedings Paper
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STEF92 Technology
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SGEM International Multidisciplinary Scientific GeoConference
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SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci
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279-286
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16 - 22 August, 2021
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website
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cdrom
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7889
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numerical algorithm; inverse problem; grid method; vibration sounding; mud volcanoes
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