Surface-wave imaging with nonrandom traffic seismic sources

IF 1.2 4区地球科学 Q3 Earth and Planetary Sciences

Earthquake Science Pub Date : 2025-04-24 DOI:10.1016/j.eqs.2025.01.003

Binbin Mi , Jianghai Xia , Hao Zhang

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引用次数: 0

Abstract

Passive surface wave imaging has been a powerful tool for near-surface characterization in urban areas, which extracts surface wave signals from ambient seismic noise and then estimates subsurface shear wave velocity by inversion of the measured phase velocity. The high-frequency (approximately >1 Hz) seismic noise fields in urban environments are dominantly induced by human activities such as the vehicle traffic. Traffic seismic sources are nonrandomly distributed in time and space. Applying standard interferometric techniques to recordings from these nonrandom noise sources makes the Green’s function liable to estimation errors. We analyze the influence of using nonrandom traffic seismic sources for surface wave imaging. With nonrandom traffic seismic sources in time, spurious signals are generated in the cross-correlation function. With nonrandom traffic seismic sources in space, surface-wave phase velocities could be overestimated in the dispersion measurement. We provide an overview of solutions for surface-wave imaging with nonrandom traffic seismic sources in time and space, aiming to improve the retrieval of high-frequency surface waves and achieve reliable results from ultrashort (tens of seconds) observations for near-surface characterization.

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非随机交通震源的表面波成像

被动面波成像技术从环境地震噪声中提取面波信号，然后通过反演测得的相速度来估计地下横波速度，已成为城市地区近地表表征的有力工具。城市环境中高频（约1hz）地震噪声场主要由车辆交通等人类活动引起。交通震源在时间和空间上具有非随机分布。对这些非随机噪声源的记录应用标准干涉技术会使格林函数容易出现估计误差。分析了非随机交通震源对地表波成像的影响。时间上的非随机交通震源会在互相关函数中产生杂散信号。在空间非随机交通震源的情况下，在频散测量中可能会高估表面波相速度。本文概述了非随机交通震源在时间和空间上的表面波成像解决方案，旨在改进高频表面波的检索，并从超短（数十秒）观测中获得可靠的结果，以用于近地表表征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Earthquake Science GEOCHEMISTRY & GEOPHYSICS-

CiteScore

1.10

自引率

8.30%

发文量

审稿时长

3 months

期刊介绍： Earthquake Science (EQS) aims to publish high-quality, original, peer-reviewed articles on earthquake-related research subjects. It is an English international journal sponsored by the Seismological Society of China and the Institute of Geophysics, China Earthquake Administration. The topics include, but not limited to, the following ● Seismic sources of all kinds. ● Earth structure at all scales. ● Seismotectonics. ● New methods and theoretical seismology. ● Strong ground motion. ● Seismic phenomena of all kinds. ● Seismic hazards, earthquake forecasting and prediction. ● Seismic instrumentation. ● Significant recent or past seismic events. ● Documentation of recent seismic events or important observations. ● Descriptions of field deployments, new methods, and available software tools. The types of manuscripts include the following. There is no length requirement, except for the Short Notes. 【Articles】 Original contributions that have not been published elsewhere. 【Short Notes】 Short papers of recent events or topics that warrant rapid peer reviews and publications. Limited to 4 publication pages. 【Rapid Communications】 Significant contributions that warrant rapid peer reviews and publications. 【Review Articles】Review articles are by invitation only. Please contact the editorial office and editors for possible proposals. 【Toolboxes】 Descriptions of novel numerical methods and associated computer codes. 【Data Products】 Documentation of datasets of various kinds that are interested to the community and available for open access (field data, processed data, synthetic data, or models). 【Opinions】Views on important topics and future directions in earthquake science. 【Comments and Replies】Commentaries on a recently published EQS paper is welcome. The authors of the paper commented will be invited to reply. Both the Comment and the Reply are subject to peer review.