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All Journal Bulletin of Scientific Contribution : Geology Phi : Jurnal Pendidikan Fisika dan Terapan
Zahrani, Deanne Ardelia
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science Physics Other

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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.
Integrated Seismotectonic Analysis of the West–Central Java Subduction System Based on Seismicity, Focal Mechanisms, and Seismic Tomography Zahrani, Deanne Ardelia; Winusda, Sinta Caenur; Hasanah, Mia Uswatun
Jurnal Phi: Kurnal Pendidikan Fisika & Terapan Vol 13 No 1 (2027)
Publisher : Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/p-jpft.v13i1.35410

Abstract

Java Island lies along the convergent boundary between Indo-Australian and Eurasian plates, making it one of the most seismically active regions in Indonesia. Numerous studies have investigated seismicity, focal mechanisms, and seismic tomography beneath West and Central Java. However, these datasets are commonly interpreted separately, and integrated assessments of slab geometry and deformation variations along subduction zone remain limited. This study combines data from ISC-EHB (1964–2022), BMKG (2009–2020), and Global CMT (1976–2022) catalogs, together with records of damaging earthquakes and tsunamis. A total of 7,746 earthquakes were analyzed and integrated with a published seismic tomography model based on the AK135 velocity model through spatial mapping and vertical cross-sections constructed at 1° longitude intervals. The results show a continuous subduction system extending beneath southern Java from west to east. Shallow earthquakes (<100 km) are concentrated near megathrust interface, intermediate-depth events (100–300 km) delineate Wadati–Benioff zone, and deep earthquakes (>300 km) indicate continued slab descent into the upper mantle. Cross-sectional analysis reveals along-strike variations in slab geometry, with relatively shallow slab configurations in the western segment and steeper geometries toward the central segment. Tomographic images show high-velocity anomalies associated with the subducting slab and low-velocity anomalies interpreted as mantle wedge regions. Focal mechanism solutions are dominated by thrust faulting at shallow depths, whereas normal and strike-slip faulting become more common at intermediate depths. These observations provide additional constraints on the relationship between slab geometry, deformation processes, fault activity, and seismic hazards in West and Central Java.
Co-Authors Mia Uswatun Hasanah Winusda, Sinta Caenur