The January 11, 2018, Mw 6.0 Bago-Yoma, Myanmar earthquake : a shallow thrust event within the deforming Bago-Yoma range
On January 11, 2018 (18:26 UTC), a Mw 6.0 earthquake occurred approximately 30 km west of the Sagaing Fault in the Bago-Yoma Range (BYR). Using a local broadband seismic network and regional seismic stations, we refine the locations and moment tensors of the earthquake sequence. We relocate 98 earth...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2021
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| Online Access: | https://hdl.handle.net/10356/152801 |
| _version_ | 1824455034001162240 |
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| author | Fadil, Wardah Lindsey, Eric Ostrom Wang, Yu Maung, Phyo Maung Luo, Heng Swe, Tint Lwin Tun, Pa Pa Wei, Shengji |
| author2 | Asian School of the Environment |
| author_facet | Asian School of the Environment Fadil, Wardah Lindsey, Eric Ostrom Wang, Yu Maung, Phyo Maung Luo, Heng Swe, Tint Lwin Tun, Pa Pa Wei, Shengji |
| author_sort | Fadil, Wardah |
| collection | NTU |
| description | On January 11, 2018 (18:26 UTC), a Mw 6.0 earthquake occurred approximately 30 km west of the Sagaing Fault in the Bago-Yoma Range (BYR). Using a local broadband seismic network and regional seismic stations, we refine the locations and moment tensors of the earthquake sequence. We relocate 98 earthquake epicenters and determine the focal mechanism and centroid depth of the mainshock and 20 aftershocks with Mw > 4. The relocated epicenters cluster in a NW-SE direction that is consistent with the strike of the mainshock fault plane solution and the slip distribution derived from ALOS-2 interferometric synthetic aperture radar observations. Most of the aftershocks have a pure thrust focal mechanism similar to the mainshock, except for four strike-slip aftershocks. The refined locations and moment tensors of the thrust events clearly delineate a fault dipping ∼40° to the southwest at a depth range of 3–7 km, indicating that the earthquake sequence ruptured a previously unmapped, active fault. We interpret the earthquake sequence to be associated with pre-existing faults within the BYR anticlinorium. This earthquake sequence and historical seismicity indicate that the upper crust of the BYR is highly stressed, resulting in ongoing distributed deformation between the oblique Rakhine megathrust and the dextral Sagaing Fault. The seismic hazard posed by these active faults has been increasing with the development of infrastructure such as dams within the BYR. Our study highlights the need for high-resolution earthquake source parameter and strong ground motion attenuation studies for further understanding of the neotectonics of Myanmar and its related seismic hazard. |
| first_indexed | 2025-02-19T03:31:47Z |
| format | Journal Article |
| id | ntu-10356/152801 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:31:47Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1528012021-10-02T20:10:54Z The January 11, 2018, Mw 6.0 Bago-Yoma, Myanmar earthquake : a shallow thrust event within the deforming Bago-Yoma range Fadil, Wardah Lindsey, Eric Ostrom Wang, Yu Maung, Phyo Maung Luo, Heng Swe, Tint Lwin Tun, Pa Pa Wei, Shengji Asian School of the Environment Earth Observatory of Singapore Science::Geology::Volcanoes and earthquakes Earthquake Myanmar On January 11, 2018 (18:26 UTC), a Mw 6.0 earthquake occurred approximately 30 km west of the Sagaing Fault in the Bago-Yoma Range (BYR). Using a local broadband seismic network and regional seismic stations, we refine the locations and moment tensors of the earthquake sequence. We relocate 98 earthquake epicenters and determine the focal mechanism and centroid depth of the mainshock and 20 aftershocks with Mw > 4. The relocated epicenters cluster in a NW-SE direction that is consistent with the strike of the mainshock fault plane solution and the slip distribution derived from ALOS-2 interferometric synthetic aperture radar observations. Most of the aftershocks have a pure thrust focal mechanism similar to the mainshock, except for four strike-slip aftershocks. The refined locations and moment tensors of the thrust events clearly delineate a fault dipping ∼40° to the southwest at a depth range of 3–7 km, indicating that the earthquake sequence ruptured a previously unmapped, active fault. We interpret the earthquake sequence to be associated with pre-existing faults within the BYR anticlinorium. This earthquake sequence and historical seismicity indicate that the upper crust of the BYR is highly stressed, resulting in ongoing distributed deformation between the oblique Rakhine megathrust and the dextral Sagaing Fault. The seismic hazard posed by these active faults has been increasing with the development of infrastructure such as dams within the BYR. Our study highlights the need for high-resolution earthquake source parameter and strong ground motion attenuation studies for further understanding of the neotectonics of Myanmar and its related seismic hazard. Ministry of Education (MOE) National Research Foundation (NRF) Published version This research study was supported by the Earth Observatory of Singapore via its funding from the National Research Foundation Singapore and the Singapore Ministry of Education under the Research Centres of Excellence initiative. 2021-10-01T08:19:23Z 2021-10-01T08:19:23Z 2021 Journal Article Fadil, W., Lindsey, E. O., Wang, Y., Maung, P. M., Luo, H., Swe, T. L., Tun, P. P. & Wei, S. (2021). The January 11, 2018, Mw 6.0 Bago-Yoma, Myanmar earthquake : a shallow thrust event within the deforming Bago-Yoma range. Journal of Geophysical Research: Solid Earth, 126(7), e2020JB021313-. https://dx.doi.org/10.1029/2020JB021313 2169-9313 https://hdl.handle.net/10356/152801 10.1029/2020JB021313 2-s2.0-85111501973 7 126 e2020JB021313 en Journal of Geophysical Research: Solid Earth 10.21979/N9/BQ11DP 10.21979/N9/QHJXU7 © 2021. The Authors.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. application/pdf |
| spellingShingle | Science::Geology::Volcanoes and earthquakes Earthquake Myanmar Fadil, Wardah Lindsey, Eric Ostrom Wang, Yu Maung, Phyo Maung Luo, Heng Swe, Tint Lwin Tun, Pa Pa Wei, Shengji The January 11, 2018, Mw 6.0 Bago-Yoma, Myanmar earthquake : a shallow thrust event within the deforming Bago-Yoma range |
| title | The January 11, 2018, Mw 6.0 Bago-Yoma, Myanmar earthquake : a shallow thrust event within the deforming Bago-Yoma range |
| title_full | The January 11, 2018, Mw 6.0 Bago-Yoma, Myanmar earthquake : a shallow thrust event within the deforming Bago-Yoma range |
| title_fullStr | The January 11, 2018, Mw 6.0 Bago-Yoma, Myanmar earthquake : a shallow thrust event within the deforming Bago-Yoma range |
| title_full_unstemmed | The January 11, 2018, Mw 6.0 Bago-Yoma, Myanmar earthquake : a shallow thrust event within the deforming Bago-Yoma range |
| title_short | The January 11, 2018, Mw 6.0 Bago-Yoma, Myanmar earthquake : a shallow thrust event within the deforming Bago-Yoma range |
| title_sort | january 11 2018 mw 6 0 bago yoma myanmar earthquake a shallow thrust event within the deforming bago yoma range |
| topic | Science::Geology::Volcanoes and earthquakes Earthquake Myanmar |
| url | https://hdl.handle.net/10356/152801 |
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