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<p>Soil liquefaction is a common feature triggered by coseismic shaking. Thus, analysis of ancient earthquake-induced liquefaction can uncover the timing and frequency of paleoseismicity. However, its potential remains an under-explored component in constraining paleoseismic events. One key issue is to accurately date the timing of paleoliquefied events and to correlate coeval liquefaction features with paleoseismic events. This study demonstrates the application of optically stimulated luminescence (OSL) dating to constrain the ages of coseismic liquefaction features generated by the 2021 Maduo earthquake and previous paleoearthquakes along the Jiangcuo fault. Assuming that the OSL signals in the sand blow sediments are fully reset at the top indicates that the paleoliquefaction events ruptured the paleosurface. Furthermore, the OSL age of the paleosurface, which is covered by the liquefied materials, provides an estimate for the real age of the paleoearthquake. At the Erlongwa site, we identified three distinct liquefied events. OSL dating directly constrains the most recent 2021 Maduo earthquake and two paleoearthquakes, which occurred at around 5 ka, and around 12–13 ka, respectively. Our results highlight the great potential of OSL dating of paleoliquefaction features to elucidate paleoseismic records in settings, i.e., blind faults buried within alluvium and shallow lacustrine sediments, where liquefaction evidence may be primary, or even exclusive.</p>

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Paleoseismic investigation using optically stimulated luminescence dating of soil liquefication: Insights from the 2021 Maduo Mw7.4 earthquake

  • 期刊论文

  • 发表日期：

    2026年2月10日

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  • Guiming Hu,
  • Jing Liu-Zeng,
  • Yanxiu Shao,
  • Chengguo Yan,
  • Longfei Han,
  • Wenqian Yao,
  • Yunpeng Gao,
  • Wenxin Wang,
  • Yueren Xu,
  • Shilong Wang

摘要

Soil liquefaction is a common feature triggered by coseismic shaking. Thus, analysis of ancient earthquake-induced liquefaction can uncover the timing and frequency of paleoseismicity. However, its potential remains an under-explored component in constraining paleoseismic events. One key issue is to accurately date the timing of paleoliquefied events and to correlate coeval liquefaction features with paleoseismic events. This study demonstrates the application of optically stimulated luminescence (OSL) dating to constrain the ages of coseismic liquefaction features generated by the 2021 Maduo earthquake and previous paleoearthquakes along the Jiangcuo fault. Assuming that the OSL signals in the sand blow sediments are fully reset at the top indicates that the paleoliquefaction events ruptured the paleosurface. Furthermore, the OSL age of the paleosurface, which is covered by the liquefied materials, provides an estimate for the real age of the paleoearthquake. At the Erlongwa site, we identified three distinct liquefied events. OSL dating directly constrains the most recent 2021 Maduo earthquake and two paleoearthquakes, which occurred at around 5 ka, and around 12–13 ka, respectively. Our results highlight the great potential of OSL dating of paleoliquefaction features to elucidate paleoseismic records in settings, i.e., blind faults buried within alluvium and shallow lacustrine sediments, where liquefaction evidence may be primary, or even exclusive.