基于非均匀介质的谱比曲线正演技术及应用

doi:10.11720/wtyht.2022.1517

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Abstract

The microtremor exploration technique has been widely used in the geological exploration of a complex urban environment due to its strong spatial adaptability and anti-mechanical interference ability.The forward modeling of microtremor characteristic curves is all based on a horizontally layered medium model,while actual strata are typical inhomogeneous geological models.The inconsistency leads to the unsatisfactory fitting degree of characteristic curves.Therefore,it is necessary to conduct forward modeling research based on the condition of inhomogeneous media.Since the geological model based on the assumption of horizontally layered media cannot meet the requirements for high-precision forward modeling of microtremor characteristic curves,forward modeling needs to be conducted using an inhomogeneous model.Based on the dynamic optimization method,this study proposed the forward modeling technique of microtremor characteristic curves to realize the forward modeling of high-precision characteristic curves of inhomogeneous media.In this technique,the aperture range and the optimization coefficients varying with frequency were calculated based on the theoretical characteristic curves of equivalent horizontally layered media.Taking spectral ratio curves as an example,the forward modeling technique of microtremor characteristic curves using the dynamic optimization method can obtain the shear wave distribution of inhomogeneous media through inversion,achieving higher lateral resolution and exploration precision.

Key words： complex urban environment frequency-domain characteristic curve inhomogeneous media microtremor technique dynamic optimization method

Received: 16 September 2021 Published: 03 January 2023

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	Articles by authors
	Tie-Hua LIU
	Tie LIU
	Bang ZHANG
	You-Yan BIAN
	Zhan-Rong ZHANG
	Xi-Rui HUA

Cite this article:

Tie-Hua LIU,Tie LIU,Bang ZHANG, et al. Inhomogeneous media-based forward modeling technique of spectrum ratio curves and its application[J]. Geophysical and Geochemical Exploration, 2022, 46(5): 1276-1282.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1517 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I5/1276

Schematic diagram of layered medium model

Schematic diagram of theoretical dispersion curves of layered media model

Schematic diagram of measured spectral ratio curve

Schematic diagram of equivalent dynamic weighting method

Spectral ratio curves of different measuring points

C7 comprehensive spectral ratio curve

Spectral ratio curves of typical measured data
a—the horizontal section;b—the single section

S-wave velocity profile after inversion
a—shear wave velocity profile based on inhomogeneous medium inversion;b—shear wave velocity profile based on horizontal water layered medium inversion

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