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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
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Articles 3 Documents
 1 
Search results for , issue " Vol 1, No 2 (1996)" : 3 Documents clear
A Short Note on : Basic Behavior of the Mount Gamalamas Eruption Lilik Hendrajaya; Surono Surono; Gunawan Handayani
Jurnal Matematika & Sains Vol 1, No 2 (1996)
Publisher : Institut Teknologi Bandung

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Abstract

Hypothesis that the tectonic force release through earthquake will trigger eruption of near by volcano when its magma pocket is full of magma, is put forward. It is mechanically reasonable due to the fact that both magma and the pocket are inside the earth crust which suffers compression stress resulted from the pushing force of oceanic crust in the subduction zone. Observation is conducted at Mount Gamalama in the island of Ternate west of the Halmahera Island, North Molluca. It is expected to have strong pushing force condition. The result shows that the triggering phenomenon is present. The other important results are the understanding of process to produce repeated volcanic eruptions and the knowledge of eruption mechanism.
Teorema Pembatasan Dimensi Dua Hendra Gunawan
Jurnal Matematika & Sains Vol 1, No 2 (1996)
Publisher : Institut Teknologi Bandung

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Abstract

In this paper we prove the two-dimensional restriction theorem using the Babenko-Hausdorff-Young and the Hardy-Littlewood-Sobolev inequalities.
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.

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