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Crustal and Upper Mantle Structure of the Thailand–Myanmar–Malaysia Region Revealed by Rayleigh Wave Phase Velocity Using Ambient Seismic Noise.

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Title: Crustal and Upper Mantle Structure of the Thailand–Myanmar–Malaysia Region Revealed by Rayleigh Wave Phase Velocity Using Ambient Seismic Noise.
Authors: Saetang, Kasemsak1 (AUTHOR) light2529@gmail.com, Srisawat, Wilaiwan2 (AUTHOR), Mishra, Pramita (AUTHOR) pmishra@wiley.com
Source: International Journal of Geophysics. 8/26/2025, Vol. 2025, p1-17. 17p.
Subjects: Rayleigh waves, Geodynamics, Earth's mantle, Southeast Asians, Group velocity, Neotectonics, Structural geology
Geographic Terms: Myanmar, Thailand, Southeast Asia
Abstract: The Thailand–Myanmar–Malaysia region is characterized by a complex tectonic setting and significant seismic hazard, necessitating a detailed understanding of its crustal and upper mantle structure. This study addresses knowledge gaps in the region's deep lithospheric structure, aiming to elucidate its tectonic evolution and geodynamics. We present high‐resolution Rayleigh wave phase velocity maps for the region, derived from ambient noise tomography using continuous seismic data from a dense network of 99 broadband stations. Through the analysis of empirical Green's functions at periods of 10–100 s, we investigate structures ranging from the middle crust to the upper mantle. The phase velocity maps at periods reveal distinct velocity variations that correlate with major tectonic features, such as the Sagaing Fault, the Shan‐Thai Terrane, and the Khorat Plateau. Low‐velocity anomalies are observed in the West Burma Terrane and the Khorat Plateau, while high‐velocity anomalies characterize the Shan‐Thai Terrane, Peninsular Thailand, and Peninsular Malaysia. At shorter periods (10–15 s), we observe a clear demarcation between high velocities in the Shan‐Thai Terrane and low velocities in the Indo‐China Terrane, reflecting significant differences in shallow crustal structure and composition. At longer periods, the phase velocity maps provide evidence for a cold, stable lithospheric mantle beneath the Shan‐Thai Terrane and Peninsular Malaysia, and thin, hot lithosphere or upwelling asthenosphere beneath central Myanmar and the Gulf of Thailand. These findings offer new insights into the region's crustal composition, thickness, and tectonic boundaries, contributing to our understanding of Southeast Asia's complex geodynamics and tectonic structure. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Geophysics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Crustal and Upper Mantle Structure of the Thailand–Myanmar–Malaysia Region Revealed by Rayleigh Wave Phase Velocity Using Ambient Seismic Noise.
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  Data: <searchLink fieldCode="AR" term="%22Saetang%2C+Kasemsak%22">Saetang, Kasemsak</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> light2529@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Srisawat%2C+Wilaiwan%22">Srisawat, Wilaiwan</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mishra%2C+Pramita%22">Mishra, Pramita</searchLink> (AUTHOR)<i> pmishra@wiley.com</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Geophysics%22">International Journal of Geophysics</searchLink>. 8/26/2025, Vol. 2025, p1-17. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Myanmar%22">Myanmar</searchLink><br /><searchLink fieldCode="DE" term="%22Thailand%22">Thailand</searchLink><br /><searchLink fieldCode="DE" term="%22Southeast+Asia%22">Southeast Asia</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The Thailand–Myanmar–Malaysia region is characterized by a complex tectonic setting and significant seismic hazard, necessitating a detailed understanding of its crustal and upper mantle structure. This study addresses knowledge gaps in the region's deep lithospheric structure, aiming to elucidate its tectonic evolution and geodynamics. We present high‐resolution Rayleigh wave phase velocity maps for the region, derived from ambient noise tomography using continuous seismic data from a dense network of 99 broadband stations. Through the analysis of empirical Green's functions at periods of 10–100 s, we investigate structures ranging from the middle crust to the upper mantle. The phase velocity maps at periods reveal distinct velocity variations that correlate with major tectonic features, such as the Sagaing Fault, the Shan‐Thai Terrane, and the Khorat Plateau. Low‐velocity anomalies are observed in the West Burma Terrane and the Khorat Plateau, while high‐velocity anomalies characterize the Shan‐Thai Terrane, Peninsular Thailand, and Peninsular Malaysia. At shorter periods (10–15 s), we observe a clear demarcation between high velocities in the Shan‐Thai Terrane and low velocities in the Indo‐China Terrane, reflecting significant differences in shallow crustal structure and composition. At longer periods, the phase velocity maps provide evidence for a cold, stable lithospheric mantle beneath the Shan‐Thai Terrane and Peninsular Malaysia, and thin, hot lithosphere or upwelling asthenosphere beneath central Myanmar and the Gulf of Thailand. These findings offer new insights into the region's crustal composition, thickness, and tectonic boundaries, contributing to our understanding of Southeast Asia's complex geodynamics and tectonic structure. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Geophysics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1155/ijge/6463164
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 17
        StartPage: 1
    Subjects:
      – SubjectFull: Rayleigh waves
        Type: general
      – SubjectFull: Geodynamics
        Type: general
      – SubjectFull: Earth's mantle
        Type: general
      – SubjectFull: Southeast Asians
        Type: general
      – SubjectFull: Group velocity
        Type: general
      – SubjectFull: Neotectonics
        Type: general
      – SubjectFull: Structural geology
        Type: general
      – SubjectFull: Myanmar
        Type: general
      – SubjectFull: Thailand
        Type: general
      – SubjectFull: Southeast Asia
        Type: general
    Titles:
      – TitleFull: Crustal and Upper Mantle Structure of the Thailand–Myanmar–Malaysia Region Revealed by Rayleigh Wave Phase Velocity Using Ambient Seismic Noise.
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            NameFull: Saetang, Kasemsak
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            NameFull: Srisawat, Wilaiwan
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            NameFull: Mishra, Pramita
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            – D: 26
              M: 08
              Text: 8/26/2025
              Type: published
              Y: 2025
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              Value: 2025
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