- PII
- S30345065S2686739725080175-1
- DOI
- 10.7868/S3034506525080175
- Publication type
- Article
- Status
- Published
- Authors
- Volume/ Edition
- Volume 523 / Issue number 2
- Pages
- 322-330
- Abstract
- The paper presents a model of the rupture surface of the Mw 7.7 earthquake that occurred in Myanmar on March 28, 2025. The model is based on the solution of the problem of stresses and strain state of a spherical radially stratified planet due to displacement on a rectangular section located within it (F. Pollitz, USGS) and displacement data obtained during the earthquake and within six following days, derived from Sentinel-1A satellite imagery (March 22, 2025, and April 3, 2025) using the offset tracking method. A regularization condition was applied, favoring slip directions close to pure right-lateral strike-slip. The results show that the main displacements on the fault occurred within the upper 5 km of the Earth's crust and ranged from 5.0 to 6.7 meters, while at greater depths the displacements were significantly smaller. An exception was a small segment of the fault located between 21.28° and 21.56°N, where the displacement at the upper level was estimated at 4.5 meters. Possible causes for the slight displacement deficit are explained in the study by the peculiarities of the aftershock process development. The constructed rupture surface model does not show significant variations in slip magnitude along the fault or the presence of local thrust or normal faulting components. GPS data collected since the early 2000s also indicate uniform elastic strain accumulation along the fault at an average rate of 20 mm/year, suggesting that the fault was locked over its entire length. The obtained results refine the rapid-response model presented on the US Geological Survey website by accounting for the Earth's sphericity and radial layering, as well as by applying the regularization condition for slip direction alignment with right-lateral strike-slip motion.
- Keywords
- землетрясение Мьянма 28.03.2025 г. спутниковая радарная интерферометрия модель поверхности сейсмического разрыва
- Date of publication
- 05.05.2025
- Year of publication
- 2025
- Number of purchasers
- 0
- Views
- 25
References
- 1. Xiong X., Shan B., Zhou Y.M., Wei S.J., Li Y.D., Wang R.J., Zheng Y. Coulomb stress transfer and accumulation on the Sagaing Fault, Myanmar, over the past 110 years and its implications for seismic hazard // Geophys. Res. Lett. 2017. V. 44. P. 4781–4789. https://doi.org/10.1002/2017GL072770
- 2. Okada Y. Surface deformation due to shear and tensile faults in a half-space // Bull. Seismol. Soc. Am. 1985. V. 75. № 2. P. 1135–1154.
- 3. Pollitz F.F. Coseismic deformation from earthquake faulting on a layered spherical Earth // Geophys. J. Int. 1996. V. 125. P. 1–14.
- 4. Genrich J.F., Bock Y., McCaffrey R., Prawirodirdjo L., Stevens C.W., Puntodewo S.S.O., Subarya C., Wdowinski S. Distribution of slip at the northern Sumatran fault system // J. Geophys. Res.: Solid Earth. 2000. V. 105. № B12. P. 28327–28341. http://dx.doi.org/10.1029/2000JB900158
- 5. Maurin T., Masson F., Rangin C., Min U.T., Collard P. First global positioning system results in northern Myanmar: constant and localized slip rate along the Sagaing Fault // Geology. 2010. V. 38. № 7. P. 591–594. http://dx.doi.org/10.1130/G30872.1
- 6. Сануджам М., Кумар А., Рой С., Каял Д.Р., Арефьев С.С. Геодинамика Индо-Бирманского хребта: сейсмологические данные // Геофизические исследования. 2009. Т. 10. № 4. С. 5–16.
- 7. Curray J.R. Tectonics of the Andaman Sea region // J. Asian Earth Sci. 2005. V. 25. № 1. P. 187–232. https://doi.org/10.1016/j.jseaes.2004.09.001
- 8. DeMets C., Gordon R.G., Argus D.F. Geologically current plate motions // Geophys. J. Int. 2010. V. 181. № 1. P. 1–80. https://doi.org/10.1111/j.1365–246X.2009.04491.x
- 9. Lindsey E.O., Wang Y., Aung L.T., Chong J.H., Qiu Q., Mallick R. et al. Active subduction and strain partitioning in western Myanmar revealed by a dense survey GNSS network // Earth Planet. Sci. Lett. 2023. V. 622. 118384. https://doi.org/10.1016/j.epsl.2023.118384
- 10. Sloan R.A., Elliott J.R., Searle M.P., Morley C.K. Active tectonics of Myanmar and the Andaman Sea / In: Myanmar: Geology, Resources and Tectonics. Eds. A.J. Barber, Khin Zaw, M.J. Crow // Geological Society, Memoirs. London, 2017. V. 48. P. 19–52. https://doi.org/10.1144/M48.2
- 11. Taylor M., Yin A. Active structures of the Himalayan-Tibetan orogen and their relationships to earthquake distribution, contemporary strain field, and Cenozoic volcanism // Geosphere. 2009. V. 5. № 3. P. 199–214. https://doi.org/10.1130/GES00217.1
- 12. Wang Y., Sieh K., Soe Thura Tun, Lai Kuang-Yin, Than Myint. Active tectonics and earthquake potential of the Myanmar region // J. Geophys. Res.: Solid Earth. 2014. V. 119. P. 3767–3822. http://dx.doi.org/10.1002/2013JB010762
- 13. Vigny C., Socquet A., Rangin C., Chamot-Rooke N., Pubellier M., Bouin M.N., Becker M. Present-day crustal deformation around Sagaing fault, Myanmar // J. Geophys. Res.: Solid Earth. 2003. V. 108. № B11. https://doi.org/10.1029/2002JB001999
- 14. Tin T.Z.H., Nishimura T., Hashimoto M., Lindsey E.O., Aung L.T., Min S.M., Thant M. Present-day crustal deformation and slip rate along the southern Sagaing fault in Myanmar by GNSS observation // J. Asian Earth Sci. 2022. V. 228. № 11. 105125. http://dx.doi.org/10.1016/j.jseaes.2022.105125
- 15. Михайлов В.О., Киселева Е.А., Тимошкина Е.П., Смирнов В.Б., Пономарев А.В., Дмитриев П.Н., Карташов И.М., Хайретдинов С.А., Арора К., Чадда Р., Шринагеш Д. Совместная интерпретация наземных и спутниковых данных для землетрясения Горха, Непал, 25.04.2015 // Современные проблемы дистанционного зондирования Земли из космоса. 2018. Т. 15. № 4. С. 119–127. http://dx.doi.org/10.21046/2070-7401-2018-15-4-119-127
- 16. Diament M., Mikhailov V., Timoshkina E. Joint inversion of GPS and high-resolution GRACE gravity data for the 2012 Wharton basin earthquakes // J. Geodynamics. 2020. V. 136. № B1. 101722. doi.org/10.1016/j.jog.2020.101722
