Crustal thicknesses in Uruguay from joint inversion of receiver functions and surface wave dispersion

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-31 DOI:10.1016/j.jsames.2024.105062

Martín Rodríguez Kacevas , Marcelo Assumpção , Leda Sánchez Bettucci , Meijian An , Mei Feng

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Abstract

The development of a seismic network in Uruguay in recent years has enabled studies of crustal structure in a region with few seismological studies of this type. In this work, we update the crustal thicknesses and Vp/Vs ratios calculated by H-k stack and present S-wave velocity models based on joint inversion of receiver functions and Rayleigh wave group velocity dispersion curves.

Some interesting results are the presence of a lower crust with a high S-wave velocity of 4.1 km/s below one of the stations located on the Río de la Plata Craton and the existence of a transitional Moho in Uruguay's northernmost station on the Paraná Basin, perhaps suggesting the presence of localized underplated material. A relatively thick crust, 41.8 km, compared to surrounding stations, was found beneath the Sierra Ballena Shear Zone in the Dom Feliciano Belt. We confirm the decrease in crustal thickness when approaching the oceanic coast, reaching a Moho depth of 36.3 km in SE Uruguay. Finally, the calculated Poisson's ratio allows inferring a crust of felsic to intermediate composition beneath most of Uruguay.

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根据接收器函数和面波频散联合反演得出的乌拉圭地壳厚度

近年来，乌拉圭地震台网的发展使我们能够在一个很少开展此类地震研究的地区开展地壳结构研究。在这项工作中，我们更新了用 H-k 叠加法计算的地壳厚度和 Vp/Vs 比值，并根据接收函数和瑞利波群速度频散曲线的联合反演，提出了 S 波速度模型。一些有趣的结果是，在位于拉普拉塔河克拉通的一个站点下方存在一个 S 波速度高达 4.1 千米/秒的下地壳，而在乌拉圭巴拉那盆地最北端的站点存在一个过渡莫霍面，这或许表明存在局部的下沉物质。在 Dom Feliciano 地带的 Sierra Ballena 剪切带下发现了相对较厚的地壳，与周围站点相比为 41.8 千米。我们证实，当接近大洋海岸时，地壳厚度会减小，在乌拉圭东南部的莫霍深度为 36.3 千米。最后，根据计算得出的泊松比，可以推断乌拉圭大部分地区的地壳成分为长岩至中岩。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.