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<p>The Cianjur region of West Java, Indonesia, experienced a moderate Mw 5.6 earthquake on November 21, 2022, with the epicenter located near the Cugenang sub-district at a depth of 10&#xa0;km. Despite its moderate size, this shallow quake caused significant damage and casualties. The event occurred approximately 15&#xa0;km north of the Cimandiri Fault Zone and is believed to have originated from an unidentified fault that was not previously mapped in Indonesian seismic hazard data. Ongoing studies are focused on identifying and mapping this fault system. For this analysis, we utilized data from the ITBCAN-2022 network, which recorded 442 aftershocks from November 22 to December 24, 2022. We then conducted a shear-wave splitting analysis to map the orientation of induced fractures generated by the aftershock sequence. Our findings show that the fast shear-wave polarized dominantly parallel to the W–E and SW–NE orientations. However, the orientations shift from WSW–ENE to SW–NE along the northern part of the suspected fault line, suggesting a predominantly stress-induced and structure-controlled contribution. The observations suggest a conjugate fault system caused the 2022 Mw 5.6 Cianjur earthquake. The anisotropy also aligns with off-fault deformation zones from the earthquake rupture. Highly anisotropic bodies within the fault zone indicate heavily fractured rocks where the rupture propagated. Consequently, a deeper analysis of this complex fault system is crucial for characterizing potential earthquake sources and for understanding rupture propagation and ground-shaking patterns.</p>

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Shear-wave anisotropy in the 2022 Mw 5.6 Cianjur earthquake area, Indonesia

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • Rexha Verdhora Ry,
  • Andri Dian Nugraha,
  • Faiz Muttaqy,
  • Z. Zulfakriza,
  • Kadek Hendrawan Palgunadi,
  • Dian Kusumawati,
  • Aditya Lesmana,
  • Ade Surya Putra,
  • Nanang T. Puspito,
  • F. Fatkhan

摘要

The Cianjur region of West Java, Indonesia, experienced a moderate Mw 5.6 earthquake on November 21, 2022, with the epicenter located near the Cugenang sub-district at a depth of 10 km. Despite its moderate size, this shallow quake caused significant damage and casualties. The event occurred approximately 15 km north of the Cimandiri Fault Zone and is believed to have originated from an unidentified fault that was not previously mapped in Indonesian seismic hazard data. Ongoing studies are focused on identifying and mapping this fault system. For this analysis, we utilized data from the ITBCAN-2022 network, which recorded 442 aftershocks from November 22 to December 24, 2022. We then conducted a shear-wave splitting analysis to map the orientation of induced fractures generated by the aftershock sequence. Our findings show that the fast shear-wave polarized dominantly parallel to the W–E and SW–NE orientations. However, the orientations shift from WSW–ENE to SW–NE along the northern part of the suspected fault line, suggesting a predominantly stress-induced and structure-controlled contribution. The observations suggest a conjugate fault system caused the 2022 Mw 5.6 Cianjur earthquake. The anisotropy also aligns with off-fault deformation zones from the earthquake rupture. Highly anisotropic bodies within the fault zone indicate heavily fractured rocks where the rupture propagated. Consequently, a deeper analysis of this complex fault system is crucial for characterizing potential earthquake sources and for understanding rupture propagation and ground-shaking patterns.