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All Journal IJOG : Indonesian Journal on Geoscience Physics Student Journal
Yasa Suparman
Pusat Vulkanologi dan Mitigasi Bencana Geologi, Badan Geologi, Jln. Diponegoro 57 Bandung
Earth & Planetary Sciences Physics

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PENDUGAAN POSISI DAPUR MAGMA GUNUNGAPI INELIKA, FLORES, NUSA TENGGARA TIMUR BERDASARKAN SURVEI MAGNETIK Fidyaningrum, Sasmita; Susilo, Adi; Suparman, Yasa
Physics Student Journal Vol 1, No 1 (2013)
Publisher : Department of Physics - Faculty of Science

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Abstract

Gunungapi Inelika, Flores, Nusa Tenggara Timur merupakan salah satu gunungapi muda berumur kuarter yang digolongkan aktif dan merupakan gunungapi tipe A. Gunungapi Inelika menampakkan kerucut gunungapi strato. Pada bagian selatan gunungapi ini, terdapat sumber air panas yang merupakan indikasi adanya potensi sumber panas bumi dimana kemungkinan dapat diindikasi kondisi dapur magma di bawah permukaan. Metode magnetik merupakan salah satu metode yang memberikan gambaran tentang sebaran kemagnetan di permukaan bumi. Data yang digunakan merupakan data magnetik sekunder tahun 2010 dimana setelah dilakukan berbagai koreksi antara lain koreksi diurnal dan koreksi IGRF, diketahui nilai anomali magnetik total gunungapi Inelika adalah -537,9 hingga 189,9 nT. Interpretasi secara kualitatif dilakukan untuk mengetahui pola kontur anomali magnetik pada daerah pengukuran. Untuk mempermudah dalam penginterpretasiannya dilakukan pengolahan data yang dikenal dengan pengangkatan (Upward Continuation) dan pengkutuban (Reduce to pole). Interpretasi kuantitatif dilakukan dengan membuat model hasil slicing (sayatan) pada kontur anomali magnetik untuk mengetahui kondisi bawah permukaan. Dengan model bawah permukaan ini dapat diindetifikasi bahwa terdapat dapur magma di daerah barat daya.
Mechanism of High Frequency Shallow Earthquake Source in Mount Soputan, North Sulawesi Suparman, Yasa; Kriswati, E.; Pamitro, Y. E.
Indonesian Journal on Geoscience Vol 6, No 3 (2011)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1662.237 KB) | DOI: 10.17014/ijog.v6i3.122

Abstract

DOI: 10.17014/ijog.v6i3.122Moment tensor analysis had been conducted to understand the source mechanism of earthquakes in Soputan Volcano during October - November 2010 period. The record shows shallow earthquakes with frequency about 5 - 9 Hz. Polarity distribution of P-wave first onset indicates that the recorded earthquakes are predominated by earthquakes where almost at all stations have the same direction of P-wave first motions, and earthquakes with upward first motions.In this article, the source mechanism is described as the second derivative of moment tensor, approached with first motion amplitude inversion of P-wave at some seismic stations. The result of moment tensor decomposition are predominated by earthquakes with big percentage in ISO and CLVD component. Focal mechanism shows that the recorded earthquakes have the same strike in northeast-southwest direction with dip about 400 - 600. The sources of the high frequency shallow earthquakes are in the form of tensile-shear cracks or a combination between crack and tensile faulting.
Co-Authors Adi Susilo E. Kriswati Sasmita Fidyaningrum Y. E. Pamitro