<p>This study investigates the three-dimensional seismogenic structures associated with the 2025 M6.4 Dapu earthquake in western Taiwan and compares these results with the relocated instrumental earthquake catalog. Utilizing a deep-learning-empowered earthquake cataloging method, 6,805 seismic events were identified from January 20 to 31, 2025, achieving a completeness magnitude (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44195_2025_93_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="24" /> </InlineMediaObject> <EquationSource Format="TEX">$M_{c}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>M</mi> <mi>c</mi> </msub> </math></EquationSource> </InlineEquation>) of 0.4. Notably, the M6.4 earthquake sequence involved the reactivation of a potentially existing fault system, characterized by an east-dipping plane at <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44195_2025_93_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="25" /> </InlineMediaObject> <EquationSource Format="TEX">$27^\circ$</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mn>27</mn> <mo>∘</mo> </msup> </math></EquationSource> </InlineEquation> between 5 and 10 km in depth and a west-dipping plane at <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44195_2025_93_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="25" /> </InlineMediaObject> <EquationSource Format="TEX">$37^\circ$</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mn>37</mn> <mo>∘</mo> </msup> </math></EquationSource> </InlineEquation> between 10 and 15 km depth. The distribution of aftershocks and triggered seismicity reveals a complex pattern of strain accumulation that influences nearby active faults. These findings underscore the necessity of continuous and detailed monitoring to better understand and potentially mitigate future seismic hazards in this region.</p>

Fast report: seismogenic structure of the 2025 M6.4 dapu earthquake sequence in western Taiwan revealed by a deep-learning-empowered earthquake catalog

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2025年3月28日

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Wu-Yu Liao,
En-Jui Lee,
Ruey-Juin Rau,
Da-Yi Chen,
Strong Wen,
Kuo-En Ching,
Wen-Tzong Liang

摘要

This study investigates the three-dimensional seismogenic structures associated with the 2025 M6.4 Dapu earthquake in western Taiwan and compares these results with the relocated instrumental earthquake catalog. Utilizing a deep-learning-empowered earthquake cataloging method, 6,805 seismic events were identified from January 20 to 31, 2025, achieving a completeness magnitude ( $M_{c}$ $M_{c}$ ) of 0.4. Notably, the M6.4 earthquake sequence involved the reactivation of a potentially existing fault system, characterized by an east-dipping plane at $27^\circ$ $27^{\circ}$ between 5 and 10 km in depth and a west-dipping plane at $37^\circ$ $37^{\circ}$ between 10 and 15 km depth. The distribution of aftershocks and triggered seismicity reveals a complex pattern of strain accumulation that influences nearby active faults. These findings underscore the necessity of continuous and detailed monitoring to better understand and potentially mitigate future seismic hazards in this region.