Inversion and Application of Shear Velocity Structure Near Transition Zone Discontinuities Based on Multiband Pds Amplitude
Sharpness of the transition zone seismic discontinuities and seismic velocity jump across the discontinuities provide important constraint on water content and mineral composition near the transition zone. The velocity models were constructed with different discontinuity sharpness and velocity jump...
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Format: | Article |
Language: | English |
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Editorial Office of Journal of Taiyuan University of Technology
2022-07-01
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Series: | Taiyuan Ligong Daxue xuebao |
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Online Access: | https://tyutjournal.tyut.edu.cn/englishpaper/show-1897.html |
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author | Jing XUE Xinxin YU Jun LI |
author_facet | Jing XUE Xinxin YU Jun LI |
author_sort | Jing XUE |
collection | DOAJ |
description | Sharpness of the transition zone seismic discontinuities and seismic velocity jump across the discontinuities provide important constraint on water content and mineral composition near the transition zone. The velocity models were constructed with different discontinuity sharpness and velocity jump to calculate corresponding receiver functions and analyze the Pds/P amplitude ratio in multiple frequency bands. The forward modeling results show that the shear velocity contrast across the discontinuity mainly affects the amplitude of Pds/P ratio while the thickness affects both the amplitude and decaying trend versus frequency. Simultaneous inversion were proposed for the discontinuity thickness and velocity jump by using a Markov Chain Monte Carlo method. Synthetic test indicates the method can effectively constrain the thickness and velocity jump. The method was applied to collected receiver function in eastern China. Results show a relatively sharp 660 km discontinuity with a 6.1% shear velocity increase over less than 2 km depth range. |
first_indexed | 2024-04-24T09:36:29Z |
format | Article |
id | doaj.art-7302d78977cb4c90890a958277c7d251 |
institution | Directory Open Access Journal |
issn | 1007-9432 |
language | English |
last_indexed | 2024-04-24T09:36:29Z |
publishDate | 2022-07-01 |
publisher | Editorial Office of Journal of Taiyuan University of Technology |
record_format | Article |
series | Taiyuan Ligong Daxue xuebao |
spelling | doaj.art-7302d78977cb4c90890a958277c7d2512024-04-15T09:15:45ZengEditorial Office of Journal of Taiyuan University of TechnologyTaiyuan Ligong Daxue xuebao1007-94322022-07-0153464064810.16355/j.cnki.issn1007-9432tyut.2022.04.0081007-9432(2022)04-0640-09Inversion and Application of Shear Velocity Structure Near Transition Zone Discontinuities Based on Multiband Pds AmplitudeJing XUE0Xinxin YU1Jun LI2College of Geophysics, Chengdu University of Technology, Chengdu 610059, ChinaCollege of Geophysics, Chengdu University of Technology, Chengdu 610059, ChinaSecond Monitoring and Application Center, China Earthquake Administration, Xi'an 710054, ChinaSharpness of the transition zone seismic discontinuities and seismic velocity jump across the discontinuities provide important constraint on water content and mineral composition near the transition zone. The velocity models were constructed with different discontinuity sharpness and velocity jump to calculate corresponding receiver functions and analyze the Pds/P amplitude ratio in multiple frequency bands. The forward modeling results show that the shear velocity contrast across the discontinuity mainly affects the amplitude of Pds/P ratio while the thickness affects both the amplitude and decaying trend versus frequency. Simultaneous inversion were proposed for the discontinuity thickness and velocity jump by using a Markov Chain Monte Carlo method. Synthetic test indicates the method can effectively constrain the thickness and velocity jump. The method was applied to collected receiver function in eastern China. Results show a relatively sharp 660 km discontinuity with a 6.1% shear velocity increase over less than 2 km depth range.https://tyutjournal.tyut.edu.cn/englishpaper/show-1897.htmlmantle transition zonereceiver function660 km discontinuitydiscontinuity sharpnessmonte-carlo method |
spellingShingle | Jing XUE Xinxin YU Jun LI Inversion and Application of Shear Velocity Structure Near Transition Zone Discontinuities Based on Multiband Pds Amplitude Taiyuan Ligong Daxue xuebao mantle transition zone receiver function 660 km discontinuity discontinuity sharpness monte-carlo method |
title | Inversion and Application of Shear Velocity Structure Near Transition Zone Discontinuities Based on Multiband Pds Amplitude |
title_full | Inversion and Application of Shear Velocity Structure Near Transition Zone Discontinuities Based on Multiband Pds Amplitude |
title_fullStr | Inversion and Application of Shear Velocity Structure Near Transition Zone Discontinuities Based on Multiband Pds Amplitude |
title_full_unstemmed | Inversion and Application of Shear Velocity Structure Near Transition Zone Discontinuities Based on Multiband Pds Amplitude |
title_short | Inversion and Application of Shear Velocity Structure Near Transition Zone Discontinuities Based on Multiband Pds Amplitude |
title_sort | inversion and application of shear velocity structure near transition zone discontinuities based on multiband pds amplitude |
topic | mantle transition zone receiver function 660 km discontinuity discontinuity sharpness monte-carlo method |
url | https://tyutjournal.tyut.edu.cn/englishpaper/show-1897.html |
work_keys_str_mv | AT jingxue inversionandapplicationofshearvelocitystructureneartransitionzonediscontinuitiesbasedonmultibandpdsamplitude AT xinxinyu inversionandapplicationofshearvelocitystructureneartransitionzonediscontinuitiesbasedonmultibandpdsamplitude AT junli inversionandapplicationofshearvelocitystructureneartransitionzonediscontinuitiesbasedonmultibandpdsamplitude |