Structural similarity of lithospheric velocity models of Chinese mainland

IF 1.2 4区 地球科学 Q3 Earth and Planetary Sciences Earthquake Science Pub Date : 2024-09-26 DOI:10.1016/j.eqs.2024.05.004
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Abstract

Existing lithospheric velocity models exhibit similar structures typically associated with the first-order tectonic features, with dissimilarities due to different data and methods used in model generation. The quantification of model structural similarity can help in interpreting the geophysical properties of Earth’s interior and establishing unified models crucial in natural hazard assessment and resource exploration. Here we employ the complex wavelet structural similarity index measure (CW-SSIM) active in computer image processing to analyze the structural similarity of four lithospheric velocity models of Chinese mainland published in the past decade. We take advantage of this method in its multiscale definition and insensitivity to slight geometrical distortion like translation and scaling, which is particularly crucial in the structural similarity analysis of velocity models accounting for uncertainty and resolution. Our results show that the CW-SSIM values vary in different model pairs, horizontal locations, and depths. While variations in the inter-model CW-SSIM are partly owing to different databases in the model generation, the difference of tomography methods may significantly impact the similar structural features of models, such as the low similarities between the full-wave based FWEA18 and other three models in northeastern China. We finally suggest potential solutions for the next generation of tomographic modeling in different areas according to corresponding structural similarities of existing models.
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中国大陆岩石圈速度模型的结构相似性
现有岩石圈速度模型表现出类似的结构,通常与一阶构造特征有关,但由于生成模型时使用的数据和方法不同而存在差异。模型结构相似性的量化有助于解释地球内部的地球物理特性,并建立对自然灾害评估和资源勘探至关重要的统一模型。在此,我们采用计算机图像处理中常用的复小波结构相似性指数(CW-SSIM)来分析近十年来发表的四个中国大陆岩石圈速度模型的结构相似性。我们利用了该方法的多尺度定义以及对平移和缩放等轻微几何失真的不敏感性,这在考虑不确定性和分辨率的速度模型结构相似性分析中尤为关键。我们的研究结果表明,CW-SSIM 值在不同的模型对、水平位置和深度都存在差异。虽然模型间 CW-SSIM 值的差异部分是由于模型生成过程中数据库的不同造成的,但层析成像方法的不同可能会对模型的相似结构特征产生重大影响,例如基于全波的 FWEA18 与中国东北地区其他三个模型之间的相似度较低。最后,我们根据现有模型的相应结构相似性,提出了不同地区下一代层析成像模型的潜在解决方案。
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来源期刊
Earthquake Science
Earthquake Science GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.10
自引率
8.30%
发文量
42
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.
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