{"title":"剪切波分裂揭示的缅甸和泰国地下各向异性双层模型","authors":"Kasemsak Saetang","doi":"10.4401/ag-8769","DOIUrl":null,"url":null,"abstract":"The first model of two layers is presented to study the anisotropy pattern beneath Myanmar and Thailand using shear-wave splitting. Teleseismic activity recorded by 15 permanent broadband stations was analysed to investigate the anisotropy and to understand the flow direction in the mantle. The flow direction and speed were observed in the forms of fast polarisation direction (𝜙) and delay time (𝛿𝑡) between fast and slow components. The measurements showed that a two-layer model beneath stations better explicates the splitting observations than a single-layer model. The upper and lower layers were interpreted as lithosphere and asthenosphere in similar patterns and compared with GPS (Global Positioning System) velocity fields and strain rate fields. Two groups of 𝜙 can be classified and matched with West-Burma Terrane (WBT) and Shan-Thai Terrane (STT). The 𝜙 represents that West-Burma Terrane moves in a northward direction, Shan-Thai Terrane and Indo-China Terrane (ICT) move in a south-eastern direction, and West-Burma Terrane has less anisotropy of 𝜙 than Shan-Thai Terrane.","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":null,"pages":null},"PeriodicalIF":16.4000,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Two-layer model of anisotropy beneath Myanmar and Thailand revealed by shear-wave splitting\",\"authors\":\"Kasemsak Saetang\",\"doi\":\"10.4401/ag-8769\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The first model of two layers is presented to study the anisotropy pattern beneath Myanmar and Thailand using shear-wave splitting. Teleseismic activity recorded by 15 permanent broadband stations was analysed to investigate the anisotropy and to understand the flow direction in the mantle. The flow direction and speed were observed in the forms of fast polarisation direction (𝜙) and delay time (𝛿𝑡) between fast and slow components. The measurements showed that a two-layer model beneath stations better explicates the splitting observations than a single-layer model. The upper and lower layers were interpreted as lithosphere and asthenosphere in similar patterns and compared with GPS (Global Positioning System) velocity fields and strain rate fields. Two groups of 𝜙 can be classified and matched with West-Burma Terrane (WBT) and Shan-Thai Terrane (STT). The 𝜙 represents that West-Burma Terrane moves in a northward direction, Shan-Thai Terrane and Indo-China Terrane (ICT) move in a south-eastern direction, and West-Burma Terrane has less anisotropy of 𝜙 than Shan-Thai Terrane.\",\"PeriodicalId\":1,\"journal\":{\"name\":\"Accounts of Chemical Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":16.4000,\"publicationDate\":\"2022-12-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Accounts of Chemical Research\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.4401/ag-8769\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.4401/ag-8769","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Two-layer model of anisotropy beneath Myanmar and Thailand revealed by shear-wave splitting
The first model of two layers is presented to study the anisotropy pattern beneath Myanmar and Thailand using shear-wave splitting. Teleseismic activity recorded by 15 permanent broadband stations was analysed to investigate the anisotropy and to understand the flow direction in the mantle. The flow direction and speed were observed in the forms of fast polarisation direction (𝜙) and delay time (𝛿𝑡) between fast and slow components. The measurements showed that a two-layer model beneath stations better explicates the splitting observations than a single-layer model. The upper and lower layers were interpreted as lithosphere and asthenosphere in similar patterns and compared with GPS (Global Positioning System) velocity fields and strain rate fields. Two groups of 𝜙 can be classified and matched with West-Burma Terrane (WBT) and Shan-Thai Terrane (STT). The 𝜙 represents that West-Burma Terrane moves in a northward direction, Shan-Thai Terrane and Indo-China Terrane (ICT) move in a south-eastern direction, and West-Burma Terrane has less anisotropy of 𝜙 than Shan-Thai Terrane.
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.
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