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All Journal Jurnal Matematika & Sains Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences JURNAL METEOROLOGI DAN GEOFISIKA Jurnal Geofisika Journal of Engineering and Technological Sciences
Sri Widiyantoro
Global Geophysics Research Division, Faculty Of Mining And Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, Jawa Barat 40132, Indonesia
Aerospace Engineering Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Mathematics Physics

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Journal : Jurnal Matematika

 1 
Tomografi Waktu Tempuh Gelombang S dan Struktur 3-D Zona Penunjaman di Bawah Busur Sunda Sri Widiyantoro; Nanang T. Puspito
Jurnal Matematika & Sains Vol 3, No 2 (1998)
Publisher : Institut Teknologi Bandung

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Tomographic imaging by using S-wave traveltime data to deliniate the three-dimensional subduction zone structure below the Sunda arc has been successfully conducted. Most of the resulting S-wave velocity model is in good agreement with the results of previous tomographic studies using P-wave traveltime data. The obtained tomographic images show that the lithospheric slab penetrates into the lower mantle beneath the Sunda arc, but there is an indication that the deep slab is detached from the seismogenic slab underneath Sumatra and the slab in the upper mantle is necking beneath Java.
Analisis Hubungan Frekuensi-Magnitudo Gempa Bumi di Bali dan Sekitarnya Wandono Wandono; Sri Widiyantoro; Gunawan Ibrahim; Edy Soewono
Jurnal Matematika & Sains Vol 9, No 3 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

We mapped the 3-D b-value variation in Bali and its vicinity through analyzing the frequency-magnitude relation. A high b-value anomaly is observed beneath the Lombok volcanic arc at 90-180 km depth interval. It is related to the zone of partial melting of basaltic magma on the subducted slab of Indian oceanic plate beneath the Eurasian plate in Nusa Tenggara Barat. This analysis supports the hypothesis about the existence of melting point on the slab.
Perbandingan Hasil Atenuasi Tomografi 3D Menggunakan Metoda Spectral Fitting & Spectral Ratio Dalam Usaha Pemetaan Bawah Permukaan (Studi Kasus Gunung Guntur) Awali Priyono; Gede Suantika; Sri Widiyantoro
Jurnal Matematika & Sains Vol 15, No 3 (2010)
Publisher : Institut Teknologi Bandung

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Spectral fitting and spectral ratio methods are tested to estimate the Q value or attenuation in the effort on imaging the subsurface structure using three-dimensional tomographic inversion techniques. In this study, we used microearthquakes data around Mount Guntur that was collected from 1995 until 2007 that consist of 4800 seismograms. Analyses using the spectral fitting and spectral ratio methods generally depict the same anomalous areas. Studies using P and S waves indicate that the area of high attenuation corresponds to the area of low velocity that extending from mount Guntur to Kamojang caldera. In terms of the image quality, it can be seen that the attenuation derived using the spectral ratio of S wave has the same pattern with the one derived using P wave. This is due to the attenuation of S wave, which was derived directly from the P-wave. The Q value in the spectral ratio method depends on the width of the frequency window taken and the effect of noise in the determination the slope of the linear relationship between the natural logarithm of spectral ratio with frequency. The result of the spectral fitting analysis shows that the pattern of S wave attenuation image is different from the pattern inferred from the P wave data, because each attenuation image has been determined separately and does not depend on each other. Since the sensitivity of the values of Qp and Qs are important in fluid rock identification, the determination of Qs should not depend directly on Qp. With the various reasons above and more influential factor in estimating the value of Q using spectral ratio, the spectral fitting method is more recommendable to be employed to determine the value of Q.
Co-Authors A. Afnimar A. Ardianto A. D. Nugraha A. Riyanto Adhatus Solichah Ahmadiyah, Adhatus Solichah Andri Dian Nugraha Ardjuna, Arii Arii Ardjuna Auly, Muhammad Fariq Riesky Awali Priyono Awan Gunawan B. S. Prabowo Bambang Sunardi Bayu Pranata, Bayu Daryono, Mudrik Rahmawan David P. Sahara Dicky Ahmad Zaky Dwa Desa Warnana Edy Santoso Edy Soewono Fadhilah, Fildzah Zaniati Gede Suantika Gede Suantika Gede Suantika Gunawan Ibrahim Gunawan Ibrahim Gunawan, Mohamad Taufik Guntur Pasau H. Afif Habibah, Nur Fani Hendro Nugroho Hiroaki Yamanaka I Nyoman Sukanta irwan meilano Jimmi Nugraha M. Muzli Masturyono Masturyono Masyhur Irsyam Moehammad Awaluddin Mohamad Ridwan Mohamad Ridwan Nanang T. Puspito Nanang T. Puspito Octantyo, Ardian Yudhi Oktavia, Nur Hidayati Palgunadi, Kadek Hendrawan Pepen Supendi Permana, Dadang Persada, Yoga Dharma Pupung Susilanto Rahman, Aditya Setyo Rahmatullah, Fajri Syukur Ramdhan, Mohammad  Rexha Verdhora Ry Ry, Rexha Verdhora Ry, Rexha Verdhora Saputra, Ryandika Sativa, Oriza Septyana, Tepy Shengji Wei Simanjuntak, Andrean Vesalius Hasiholan Sirait, Anne Meylani Magdalena Sorja Koesuma Suhardja, Sandy Kurniawan Sujabar, Sujabar Sulastri Sulastri Supendi, Pepen Supriyanto Rohadi Suryanto, Wiwit Syaifuddin, Firman Tepy Septyana Thomas Hardy Triahandini, Agnis Triyono, Rahmat Wallansha, Robby Wandono Wandono Wiko Setyonegoro Y.M. Husni Yoichi Fukuda Z. Zulfakriza Zulfakriza, Zulfakriza