gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2025-16-1-0803lezdxigtcrust-1990Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSПРЯМАЯ ИНВЕРСИЯ ДИСПЕРСИИ ГРУППОВОЙ СКОРОСТИ ВОЛН РЭЛЕЯ ДЛЯ ТРЕХМЕРНОЙ СТРУКТУРЫ СКОРОСТИ КОРОВЫХ СДВИГОВЫХ ВОЛН В ТАИЛАНДЕ, МЬЯНМЕ И МАЛАЙЗИИDIRECT INVERSION OF RAYLEIGH WAVE GROUP VELOCITY DISPERSION FOR 3D CRUSTAL SHEAR WAVE VELOCITY STRUCTURE IN THAILAND, MYANMAR, AND MALAYSIAСаетанК.SaetangK.

Провинция Накхон Си Тхаммарат, 80280, Таиланд

Nakhon Si Thammarat Province, 80280, Thailand

СрисаватВ.SrisawatW.

Провинция Накхон Си Тхаммарат, 80000, Таиланд

Nakhon Si Thammarat Province, 80000, Thailand

Университет Накхон Си Тхаммарат РаджабхатТаиландNakhon Si Thammarat Rajabhat UniversityThailandМуниципальная школа Ват ТхапхоТаиландWatthapho Municipal SchoolThailand202519022025161803803Copyright © Саетан К., Срисават В., 20252025Саетан К., Срисават В.Saetang K., Srisawat W.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/1990

Данная работа представляет собой комплексное исследование строения земной коры в Таиланде, Мьянме и Малайзии с использованием данных о дисперсии волн Рэлея, зарегистрированных сетью из 49 станций. Метод прямой инверсии был применен при разработке трехмерной модели земной коры в высоком разрешении для расчета скорости сдвиговых волн, в обход традиционного промежуточного этапа картирования групповых скоростей. Метод быстрого марша использовался для расчета времени пробега и траекторий поверхностных волн, обеспечивающих точное отображение комплексного характера распространения волн в неоднородной структуре Земли. Полученная трехмерная модель скорости с параметрами 120 (долгота) × 112 (широта) × 9 (глубина) и общим числом опорных точек 120960 выявляет значительную латеральную неоднородность, коррелирующую с главными тектоническими структурами, такими как Западно-Бирманский блок, Шан-Тайский террейн, Индокитайский террейн, а также разлом Сагаинг. Интеграция полученных результатов с уже имеющимися геологическими и геофизическими данными предоставляет возможность критического осмысления тектонической эволюции и коровой динамики этого сейсмически активного региона, углубляя понимание взаимосвязи между тектоническими процессами и строением земной коры в Юго-Восточной Азии.

This study presents a comprehensive investigation of the crustal structure in Thailand, Myanmar, and Malaysia using Rayleigh wave dispersion data from a dense network of 49 seismic stations. A direct inversion approach is employed to derive a high-resolution, 3D shear wave velocity model of the crust, circumventing the traditional intermediate step of constructing group velocity maps. The Fast Marching Method is utilized to compute surface wave travel times and ray paths, ensuring an accurate representation of the complex wave propagation patterns within the heterogeneous Earth structure. The resulting 3D velocity model, with dimensions of 120 (longitude) × 112 (latitude) × 9 (depth) and a total of 120960 grid points, reveals significant lateral heterogeneity that correlates with major tectonic features such as the West Burma terrane, Shan-Thai terrane, Indo-China terrane, and the Sagaing fault. The integration of these findings with existing geological and geophysical knowledge provides critical insights into the tectonic evolution and crustal dynamics of this seismically active region, furthering our understanding of the complex interplay between tectonic processes and crustal architecture in Southeast Asia.

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The authors declare that there are no conflicts of interest present.