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The 28 March 2025 Mw 7.7 Myanmar earthquake: spatio-temporal rupture evolution and source characteristics.

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Title: The 28 March 2025 Mw 7.7 Myanmar earthquake: spatio-temporal rupture evolution and source characteristics.
Authors: Kumar, Ajay1 (AUTHOR), Chaudhuri, Dibyajyoti2 (AUTHOR), Banerjee, Rupak2 (AUTHOR), Mondal, Sankarshan2 (AUTHOR), Shamim, Sk.2 (AUTHOR), Yadav, Tarak2 (AUTHOR), Mitra, Supriyo2,3 (AUTHOR) supriyomitra@iiserkol.ac.in
Source: Journal of Earth System Science. Jun2026, Vol. 135 Issue 2, p1-16. 16p.
Subject Terms: *Earthquakes, *Geologic faults, *Earthquake hazard analysis, *Surface fault ruptures, *Earthquake zones, *Earthquake aftershocks
Geographic Terms: Myanmar
Abstract: The 28 March 2025 Mw 7.7 earthquake in Myanmar occurred along the N–S striking Sagaing Fault near Mandalay and ruptured a previously identified 'seismic gap'. This shallow, bilateral rupture spanned ∼ 400 km and lasted about 80 s. The rupture initially propagated northward at sub-shear speed and then transitioned to a super-shear southward rupture, which likely sustained the rupture on such a long fault. The mainshock was followed by a significant Mw 6.7 aftershock just 11 minutes later. Teleseismic-waveform-data analysis of the mainshock revealed three distinct sub-events, with the central one (10–40 s) contributing the most energy and dominating the radiation pattern. A frequency-dependent radiation is observed for the super-shear southern rupture, which ended in oblique–slip. The mainshock seismic moment is ∼ 6.26 × 10 20 N.m, and moment magnitude is 7.79. The average slip on the fault is ∼ 2 m, with stress-drop of ∼ 15 ± 5 bars. Source directivity analysis indicated stronger ground motion to the south, consistent with the super-shear rupture. The mainshock not only released the strain, accumulated over decades, on the Sagaing Fault, but potentially increased stress on the adjacent, fully-locked Rakhine-Bangladesh megathrust. This has major implications for seismic hazard in Bangladesh and northeast India. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 193197801
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PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: The 28 March 2025 Mw 7.7 Myanmar earthquake: spatio-temporal rupture evolution and source characteristics.
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  Data: <searchLink fieldCode="AR" term="%22Kumar%2C+Ajay%22">Kumar, Ajay</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chaudhuri%2C+Dibyajyoti%22">Chaudhuri, Dibyajyoti</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Banerjee%2C+Rupak%22">Banerjee, Rupak</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mondal%2C+Sankarshan%22">Mondal, Sankarshan</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shamim%2C+Sk%2E%22">Shamim, Sk.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yadav%2C+Tarak%22">Yadav, Tarak</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mitra%2C+Supriyo%22">Mitra, Supriyo</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<i> supriyomitra@iiserkol.ac.in</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Earth+System+Science%22">Journal of Earth System Science</searchLink>. Jun2026, Vol. 135 Issue 2, p1-16. 16p.
– Name: Subject
  Label: Subject Terms
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  Data: *<searchLink fieldCode="DE" term="%22Earthquakes%22">Earthquakes</searchLink><br />*<searchLink fieldCode="DE" term="%22Geologic+faults%22">Geologic faults</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquake+hazard+analysis%22">Earthquake hazard analysis</searchLink><br />*<searchLink fieldCode="DE" term="%22Surface+fault+ruptures%22">Surface fault ruptures</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquake+zones%22">Earthquake zones</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquake+aftershocks%22">Earthquake aftershocks</searchLink>
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  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Myanmar%22">Myanmar</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The 28 March 2025 Mw 7.7 earthquake in Myanmar occurred along the N–S striking Sagaing Fault near Mandalay and ruptured a previously identified 'seismic gap'. This shallow, bilateral rupture spanned ∼ 400 km and lasted about 80 s. The rupture initially propagated northward at sub-shear speed and then transitioned to a super-shear southward rupture, which likely sustained the rupture on such a long fault. The mainshock was followed by a significant Mw 6.7 aftershock just 11 minutes later. Teleseismic-waveform-data analysis of the mainshock revealed three distinct sub-events, with the central one (10–40 s) contributing the most energy and dominating the radiation pattern. A frequency-dependent radiation is observed for the super-shear southern rupture, which ended in oblique–slip. The mainshock seismic moment is ∼ 6.26 × 10 20 N.m, and moment magnitude is 7.79. The average slip on the fault is ∼ 2 m, with stress-drop of ∼ 15 ± 5 bars. Source directivity analysis indicated stronger ground motion to the south, consistent with the super-shear rupture. The mainshock not only released the strain, accumulated over decades, on the Sagaing Fault, but potentially increased stress on the adjacent, fully-locked Rakhine-Bangladesh megathrust. This has major implications for seismic hazard in Bangladesh and northeast India. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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        Value: 10.1007/s12040-026-02754-y
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      – Code: eng
        Text: English
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        PageCount: 16
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      – SubjectFull: Earthquakes
        Type: general
      – SubjectFull: Geologic faults
        Type: general
      – SubjectFull: Earthquake hazard analysis
        Type: general
      – SubjectFull: Surface fault ruptures
        Type: general
      – SubjectFull: Earthquake zones
        Type: general
      – SubjectFull: Earthquake aftershocks
        Type: general
      – SubjectFull: Myanmar
        Type: general
    Titles:
      – TitleFull: The 28 March 2025 Mw 7.7 Myanmar earthquake: spatio-temporal rupture evolution and source characteristics.
        Type: main
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          Name:
            NameFull: Kumar, Ajay
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            NameFull: Chaudhuri, Dibyajyoti
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            NameFull: Banerjee, Rupak
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            NameFull: Mondal, Sankarshan
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            NameFull: Shamim, Sk.
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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              Value: 02534126
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              Value: 135
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            – TitleFull: Journal of Earth System Science
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