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Journal : Journal of Multidisciplinary Applied Natural Science

Subsurface Identification Using Horizontal to Vertical Spectral Ratio and Inverse Velocity Modelling in Suoh Pull-apart Basin, Indonesia Mulyasari, Rahmi; Sarkowi, Muh; Haerudin, Nandi; Utama, Hari Wiki; Widiatama, Angga Jati; Darmawan, I Gede Boy; Kurniawan, Andri; Husni, Yayan Mi’rojul; Hesti, Hesti; Fatmawati, Nofita; Marlina, Serli
Journal of Multidisciplinary Applied Natural Science Articles in Press
Publisher : Pandawa Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47352/jmans.2774-3047.366

Abstract

Suoh is a pull-apart basin located along the Semangko segment of the Sumatra Fault Zone and filled by thick fluvio-volcanic and alluvial deposits that strongly amplify seismic waves and increase surface damage during earthquakes. This study aims to perform seismic micro-zonation of Suoh using the horizontal-to-vertical spectral ratio (HVSR) method combined with shallow shear-wave velocity (Vs) inversion to support hazard assessment and land-use planning in the Suoh aspiring geopark. Single station microtremor measurements were acquired at 30 sites and processed with Geopsy to obtain dominant frequency (f0), amplification factor (A0), and seismic vulnerability index (Kg). The HVSR curves were further inverted using the Dinver module to retrieve 1D Vs profiles, with initial models constrained by the global CRUST1.0 model and local geology. The results indicate strong lateral variability in site conditions, with low f0 and high A0 values concentrated in the central–western basin, producing high Kg and reflecting thick-soft sediments overlying deep engineering bedrock (Vs ≥ 800 m/s) at depths exceeding 80–100 m. These high-vulnerability zones spatially coincide with shallow seismicity associated with the Semangko Fault. Based on Kg, the study delineates low, moderate, and high seismic vulnerability zones, highlighting areas where seismic amplification and resonance effects are most pronounced. The combination of HVSR parameters with 2D Vs imaging provides a practical framework for identifying high-risk zones and guiding risk-informed land-use planning in tectono-volcanic basins such as Suoh.
Co-Authors A.A. Ketut Agung Cahyawan W Afrella Dewita, Cindy Afriani, Depta Aisyah Gustia, Bening ANDRI KURNIAWAN Anggraini, Vivi Anna Ayu Herawati Annisa Annisa Asdi Wirman Attala Maulidda Aulia, Hasnatul Aurella, My Zhura Ayu Herawati, Anna Ayu Nofika, Revina azilawati, nurul batubara, lailatussipah Berliana Zaira, Nabilla Chandra Chandra Dadan Suryana Darmawan, I Gede Boy Desmaneli, Willia Desrianti, Vivi Diana Diana Elmasari, Resti Elva Reza Engfita wahyuni, Monica Epin, Epin Fadgita, Fadgita Farida Mayar Febryan Putera, Rafhi Gusnita, Elvira Gusti Ayu, Susi Hafifah, Siti Hamdani, Miftahul Khairina Handayani, Rani Hartinah Hartinah Henifo Oktari Hesti Hesti hilda ningsih, nurul Hulliyah, Revinka Husni, Yayan Mi’rojul Imam Muthie Indra Yeni Indriani , Faradila Isa Hidayati Ismah, Zakiatul Jamal Jamal Juita, Ratna Fitri Julia Citra Afriza Khairunnisa, Mitra KK, Indra Frana Jaya Lathifah Afra Amani Latifah, Rahmy Mailona, Welli Mardiah, Nada Afviva Melia Eka Daryati Mila Wirnasari Muh Sarkowi Mulyasari, Rahmi Nabilla Berliana Zaira Nadia Yulisyafira Nandi Haerudin Nenny Mahyuddin Ninda Trinovia Nofita Fatmawati Novita, Ria Nufus, Anyla Hayatun Nur Hazizah Nurhafizah Nurhafizah Nurhazizah, Nurhazizah NURUL ANNISA Nurul Arifah NURUL ARIFAH Nur’aini Malik Pratama, Riza Aulia PUJI LESTARI Puji Lestary Qalbi, Zahratul Rafhi Febryan Putera Rahmah, shofiathur Rahmayanti, Putri Rahmi, Nicky Zonita Ramadhani, Ayu Ratih Elia Nova Restu Asriya, Fitri Revina Ayu Nofika Rina Wulandari Rismareni Pransiska Ruspa, Yona Aldi Safitri, Mella Mimi Safyana, Suci Indra Sari, Minda Sari, Resti Elma Saridewi, Saridewi Seftiana, Selly Shinta Shinta Sopia, Sopia Sri Cahaya Sihombing Sri Hartati Suhada, Nadia Sujana, Mutiara Syahrul Ismet Warrizqi, Iftitahurrahmi Welli Mailona Wetra, Wati Widiatama, Angga Jati Widiawati Widiawati, Widiawati Wulandary, Zyiva Yaswinda Yaswinda Yesni Yenti Yulianti, Resma Yulisyafira, Nadia Yunianti, Fifi Yunita, Arni Zahratul Qalbi Zulhijrawanti Zulminiati Zulminiati Zyaqiah Almuna Wara Zyiva Wulandary