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All Journal Indonesian Journal of Geography JOURNAL ONLINE OF PHYSICS Jurnal Sisfokom (Sistem Informasi dan Komputer) Prosiding University Research Colloquium Indonesian Journal of Environment and Disaster
Koesuma, Sorja
Department of Physics, Sebelas Maret University
Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Environmental Science Law, Crime, Criminology & Criminal Justice Medicine & Pharmacology Physics

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Journal : JOURNAL ONLINE OF PHYSICS

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BAHAYA GEMPA BUMI BERDASARKAN KONDISI GEOLOGI LOKAL DALAM UPAYA MITIGASI BENCANA DI KAPANEWON PLERET, KABUPATEN BANTUL Triyono, Agus; Paripurno, Eko Teguh; Nugroho, Arif Rianto; Koesuma, Sorja; Maharani, Yohana Noradika
JOURNAL ONLINE OF PHYSICS Vol. 10 No. 3 (2025): JOP (Journal Online of Physics) Vol 10 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v10i3.44703

Abstract

Kapanewon Pleret merupakan salah satu wilayah dengan tingkat kerusakan tertinggi saat gempa bumi Bantul 27 Mei 2006. Namun hingga saat ini, belum terdapat kajian yang secara khusus memetakan karakteristik geologi lokal dan kerentanan seismik di wilayah ini. Penelitian ini bertujuan untuk mengevaluasi potensi bahaya gempa bumi di Kapanewon Pleret, Kabupaten Bantul, berdasarkan karakteristik geologi lokal yang diperoleh melalui metode Horizontal to Vertical Spectral Ratio (HVSR). Data mikrotremor dari 70 titik diolah untuk memperoleh parameter frekuensi dominan (fₒ), faktor amplifikasi (Aₒ), indeks kerentanan seismik (Kg), percepatan tanah maksimum (PGA), dan Ground Shear Strain (GSS). Hasil penelitian menunjukkan bahwa nilai fₒ berkisar antara 0,62–12,17 Hz, Aₒ antara 0,89–6,41, dan Kg dalam rentang 0,18–26,02. Nilai PGA berada pada kisaran 0,08 hingga >0,79 g, sementara GSS tercatat antara 1,06 × 10⁻⁴ hingga 1,42 × 10⁻². Zona dengan nilai fₒ rendah, Aₒ tinggi, serta Kg dan GSS tinggi banyak ditemukan pada wilayah yang tersusun atas endapan Merapi muda, yang menunjukkan tingkat kerentanan seismik yang signifikan. Temuan ini menegaskan pentingnya karakterisasi geologi lokal sebagai dasar perencanaan mitigasi bencana gempa bumi.
IMPACT OF SOLAR RADIATION MODIFICATION ON TEMPERATURE CHANGES FROM SINABUNG ERUPTION IN KARO REGENCY Koesuma, Sorja; Sakhina, Friska Ayu; Gernowo, Rahmat
JOURNAL ONLINE OF PHYSICS Vol. 11 No. 1 (2025): JOP (Journal Online of Physics) Vol 11 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v11i1.47783

Abstract

This study combines reanalysis of observational data and climate modelling to examine temperature changes due to the eruption of Mount Sinabung and future temperature projections. Observation data were taken from ERA5 to identify local temperature changes following the Sinabung eruption in February 2018, while simulations from the Geoengineering Model Intercomparison Project (GeoMIP) were used to observe temperature responses under the Solar Radiation Modification (SRM) scenario. Temperature projections were conducted for the period 2026 – 2099 using the CESM-WACCM, CNRM-ESM2-1, and MPI-ESM1-2-LR models under the G6Solar, G6Sulfur, SSP2-4.5, and SSP5-8.5 scenarios. The results show that GeoMIP temperatures are lower than ERA5 after bias correction. SRM was found to effectively decrease temperature at the summit of Sinabung and Karo Regency, approaching low emission scenarios (SSP2-4.5), with increases of 1,90℃ and 1,05℃ under G6Solar, and 1,02℃ and 0,96℃ under G6Sulfur. Conversely, in the high emission scenarios (SSP5-8.5), temperatures increased to 2,13℃ and 2,1℃.
Co-Authors Abdullah, Azar Rafliardi Agus Triyono Agusta Praba Ristadi Pinem Ananta, Aria Arga Ari Handono Ramelan Bambang Sunardi, Bambang Budi Legowo Catur Edi Widodo Darsono Darsono Doddy Sutarno eka rahmawati Eko Teguh Paripurno Fajrin, Viola Harjana Harjana Imam Arifin Iwan Yahya Krismonanto, Wisnu Mariany, Aria Nabila, Dhia Azmi Nugroho, Arif Rianto Nursodik, Fajar Pratiwi, Rizki Amalia Purnama, Anton Roy Rahmat Gernowo Sakhina, Friska Ayu Salfas, Muhammad Silvanto, Tri Susanto, Andika Dwi Cipta Syahrizal, Fadli Yohana Noradika Maharani