基于微动的千米深度勘探关键影响因素

doi:10.11720/wtyht.2024.1358

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Abstract

To explore the critical factors influencing the results of microtremor-based exploration at a depth of thousands of meters,this study conducted experiments using triangular arrays based on spatial autocorrelation(SPAC) and extended SPAC(ESPAC).Focusing on factors such as array size,acquisition unit frequency,and acquisition duration,this study explored the frequency band ranges corresponding to different array sizes,the arrangement of arrays in kilometer-depth exploration for obtaining both deep and shallow data,and the improvement in deep resolution.Based on the analysis and discussion results,this study established a parameter-setting system to improve the accuracy of exploration at a depth of thousands of meters.

Key words： microtremor exploration kilometer depth exploration accuracy influencing factor

Received: 31 August 2023 Published: 27 June 2024

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	Juan-Juan QI

Cite this article:

Juan-Juan QI. Critical factors in microtremor-based exploration at a depth of thousands of meters[J]. Geophysical and Geochemical Exploration, 2024, 48(3): 777-785.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1358 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I3/777

Basic principle of microtremor

Groups of acquisition unit spacing combination

Diagram of 7-embedded triangular array

Description of embedded triangular array scale

Dispersion curves obtained with different numbers of acquisition units

Examples of kilometer deep exploration

Comparison of dispersion curves obtained by different frequency acquisition units

Dispersion curves obtained with different acquisition duration

Dispersion curves obtained with different array sizes

Statistics of frequency range corresponding to different array sizes

Dispersion curves obtained with different embedded triangular array sizes

Comparison of dispersion curves obtained by different minimum side length array and 7-embedded triangular array

Dispersion curves obtained with different iteration sample number

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