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<p>A systematic evaluation of Earthquake Environmental Effects (EEEs) was conducted for the 24 March 2011 Tarlay earthquake (Mw 6.8) in eastern Myanmar using the Environmental Seismic Intensity (ESI-07) scale. The earthquake produced various ground effects, including a surface rupture extending approximately 30&#xa0;km, widespread liquefaction, landslides, and large ground fissures. These ground effects were mapped and analyzed to determine ESI-07 intensity values based on their dimensions and spatial distribution. The maximum ESI-07 intensity in the mesoseismal area was assessed as IX–X. To evaluate the effectiveness of the ESI-07 scale, the derived intensities were compared with those from the Modified Mercalli Intensity (MMI) scale. The ESI-07 values were higher by two to three degrees than the MMI values, reflecting the sensitivity of the ESI-07 scale to earthquake environmental effects rather than structural damage. This underscores the value of the ESI-07 scale in enhancing seismic intensity assessments, particularly for intraplate earthquakes in regions where building-related damage records are sparse or inconsistent due to heterogeneous building code practices or highly vegetated, rugged terrain like that of Myanmar. The application of the ESI-07 scale to the 2011 Tarlay earthquake (Mw 6.8) illustrates its potential for assessing other recent and historical seismic events across Myanmar and other intraplate regions in South Asia, contributing to improved seismic intensity estimation and hazard analysis.</p>

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Macroseismic intensity estimation based on earthquake environmental effects (EEEs) for the 2011 Tarlay earthquake, Myanmar: a case study from intraplate tectonic setting

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Sambit Prasanajit Naik,
  • Vinay Singh Chufal,
  • Saw Ngwe Khaing,
  • Myo Thant,
  • Soe Thura Tun,
  • Uday Bhan

摘要

A systematic evaluation of Earthquake Environmental Effects (EEEs) was conducted for the 24 March 2011 Tarlay earthquake (Mw 6.8) in eastern Myanmar using the Environmental Seismic Intensity (ESI-07) scale. The earthquake produced various ground effects, including a surface rupture extending approximately 30 km, widespread liquefaction, landslides, and large ground fissures. These ground effects were mapped and analyzed to determine ESI-07 intensity values based on their dimensions and spatial distribution. The maximum ESI-07 intensity in the mesoseismal area was assessed as IX–X. To evaluate the effectiveness of the ESI-07 scale, the derived intensities were compared with those from the Modified Mercalli Intensity (MMI) scale. The ESI-07 values were higher by two to three degrees than the MMI values, reflecting the sensitivity of the ESI-07 scale to earthquake environmental effects rather than structural damage. This underscores the value of the ESI-07 scale in enhancing seismic intensity assessments, particularly for intraplate earthquakes in regions where building-related damage records are sparse or inconsistent due to heterogeneous building code practices or highly vegetated, rugged terrain like that of Myanmar. The application of the ESI-07 scale to the 2011 Tarlay earthquake (Mw 6.8) illustrates its potential for assessing other recent and historical seismic events across Myanmar and other intraplate regions in South Asia, contributing to improved seismic intensity estimation and hazard analysis.