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All Journal Bulletin of Scientific Contribution : Geology Phi : Jurnal Pendidikan Fisika dan Terapan Prosiding Penelitian dan Pengabdian kepada Masyarakat Chimica et Natura Acta Jurnal Geofisika PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Mia Uswatun Hasanah
Laboratorium Geofisika, Departemen Geofisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Padjadjaran
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Physics Social Sciences Other

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Karakteristik Atenuasi Gelombang Seismik di Daerah Ternate, Maluku Utara dengan menggunakan Analisis Gelombang Coda Satriani, Fatima Marjan Keshia; Anggono, Titi; Hasanah, Mia Uswatun
Jurnal Geofisika Vol 23 No 1 (2025): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v23i1.660

Abstract

The convergence of the Philippine Plate, the Eurasian Plate, the Australian Plate, and the double subduction between the Molucca Sea Plate, the Sangihe Through, and the Halmahera Through have created a complex tectonic setting in North Maluku. Due to intense tectonic activity, this region frequently experiences the possibility of tectonic events like earthquakes. In the attenuation seismology approach, seismic waves propagating below the surface are measured for amplitude amplification and attenuation. Seismic wave attenuation propagating in this region is described using the coda attenuation method on coda seismic waves. In order to determine the degree of tectonic activity in the Ternate region, 129 earthquake data points from four sites in North Maluku that were less than 40 kilometers deep were processed. Stations SP01 and SP02 are situated on Ternate Island, whereas stations BB06 and SP28 are situated on Hiri Island. A sampling frequency of 2 – 10 Hz and a window length of 20 – 120 s were used to get values of the coda (Q0), η, Qc, and attenuation (Qc-1). Twi times the S-wave’s arrival time is assumed for the coda wave. The coda variation values (Q0) were recorded as follows: an average of 112. 167 for station SP01, 91.071 for station SP02, 116.089 for station SP28, and 112.843 for station BB06. The value increases and decreases within the 20 – 40 s range. The values of attenuation and (Q0) are inversely related. The Q0 and Qc values obtained are low due to the high damping value in the Ternate area. The high damping (Qc-1), high eta (η) value (>1), and low Q0 value (<200) are thought to be signs of strong tectonic activity in the Ternate, Halmahera, North Maluku region.
ANALISIS PERSEBARAN SEISMISITAS DAN MEKANISME FOKAL DI WILAYAH TIMUR PULAU JAWA Winusda, Sinta Caenur; Zahrani, Deanne Ardelia; Hasanah, Mia Uswatun
Bulletin of Scientific Contribution Vol 24, No 1 (2026): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v24i1.68682

Abstract

Pulau Jawa merupakan wilayah dengan aktivitas seismotektonik kompleks akibat interaksi antara subduksi Lempeng Indo-Australia dan Lempeng Sunda serta keberadaan sejumlah sesar aktif di daratan. Penelitian ini bertujuan untuk menganalisis persebaran seismisitas dan mekanisme fokal gempa bumi di kawasan Jawa Timur sebagai kajian awal untuk memahami pola tektonik regional. Data yang digunakan meliputi katalog ISC-EHB (1964–2021), BMKG (2009–2021), serta data moment tensor dari GCMT (1976–2022). Setelah proses penyaringan dan penggabungan, sebanyak 13.782 kejadian gempa dianalisis berdasarkan distribusi spasial, kedalaman, serta penampang vertikal per interval 1° bujur. Hasilnya menunjukkan pola seismisitas yang mengikuti geometri subduksi Indo-Australia, membentuk zona Wadati–Benioff dengan kemiringan slab curam ke arah utara–timur laut hingga kedalaman ~600 km. Variasi seismisitas antar lintasan mengindikasikan adanya kemungkinan slab tear dan zona seismic gap pada segmen tengah. Mekanisme fokal memperlihatkan dominasi thrust fault di zona megathrust, sementara wilayah daratan didominasi sesar strike-slip dan oblique-slip yang berkaitan dengan Sesar Kendeng Timur, Probolinggo, dan Blitar. Temuan ini mengonfirmasi bahwa deformasi tektonik di Jawa Timur dipengaruhi oleh kombinasi proses subduksi dan aktivitas sesar lokal, yang penting untuk pemodelan bahaya seismik dan mitigasi bencana gempa bumi di wilayah ini.
Co-Authors Abie Besman Andri Dian Nugraha Anggie Susilawati Ardhi, Nanang Dwi Budianto, Muhammad Abdillah Budy Santoso Dini Fitriani Eleonora Agustine Ferani, Selly Hilman Suwarga Iriyanti, Mimin Kartika Hajar Kirana Ladaya A. Rakhmawati Meilanny Budiarti Santoso Meilanny Budiarti Santoso, Meilanny Budiarti Mimin Iriyanti Muhammad Rahmat Sule Nanang Dwi Ardhi Pranatikta, Krishna Agra Satriani, Fatima Marjan Keshia Selly Ferani Shafaria, Mileani Subagio subagio Titi Anggono Winusda, Sinta Caenur Zahrani, Deanne Ardelia