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Nanang T. Puspito
Jurusan Geofisika & Meteorologi FMIPA ITB
Mathematics

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Struktur Kecepatan Gelombang Gempa dan Koreksi Stasiun Seismologi di Indonesia Nanang T. Puspito
Jurnal Matematika & Sains Vol 1, No 2 (1996)
Publisher : Institut Teknologi Bandung

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Abstract

We have determined the spherically-layered model for P-wave velocity structure and station corrections for seismographic stations in the Indonesian region and its surrounding. The P-wave velocity structure has been developed down to a depth of 700 km while the station corrections have been determined for 35 seismographic stations located in the study region. We inverted the P-wave travel-times data by using the so called "damped least-squares inversion method"1,7). The modeling space is divided into 15 homogeneously layers with the initial velocity model based on the modification from Jeffrey-Bullen6). We employed 13,115 P-wave travel-times data from 459 earthquakes occurring in the period of 1984 to 1988. The data were taken from the bulletin of International Seismological Center (ISC) London. We performed the inversion for 10 iterations. The solutions can be considered to have achieved convergence after the 6-th iteration. The average travel-time residuals were reduced from 0.40 sec to 0.08 sec. The obtained velocity structure model faster than the initial model of Jeffrey-Bullen. The obtained station corrections for seismographic stations in Sumatra and Java show negative values. In the Philippine Islands, Banda Sea, Northern Australia, and Malay Peninsula the obtained station corrections show positive values.
Perhitungan Respons Elektromagnetik Lapisan Tipis Heterogen Menggunakan Metoda Persamaan Integral Hendra Grandis; Nanang T. Puspito
Jurnal Matematika & Sains Vol 3, No 1 (1998)
Publisher : Institut Teknologi Bandung

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The computation of electromagnetic response of a 3-D model which represents subsurface electric conductivity distribution is done by resolving the Maxwells equations using the integral equation method. In order to simplify the problem, it is assumed that the 3-D inhomogeneity is confined in a thin layer embedded in a horizontally stratified (1-D) medium. The algorithm is applied to compute the response of two simple models containing either resistive and conductive inhomogeneity. The apparent resistivity, phase and magnetic transfer function give general features of the models.
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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Abstract

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.
Co-Authors Hendra Grandis Sri Widiyantoro