Struktur Kecepatan S antara Gempa C081499A, Sumatera Selatan Stasiun Observasi RER  

Oleh:

Santosa, Bagus Jaya

Jenis: Article from Journal - ilmiah nasional - terakreditasi DIKTI
Dalam koleksi: Makara Seri Sains vol. 9 no. 2 (2005), page 52-55.
Topik: Seismogram Analysis; S Velocity Model; Indian Ocean

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: MM65.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

The research investigated the S speed of earth structure under Indian Ocean using seismogram fitting, due to the C08 1499A earthquake, South Sumatra and recorded in the observation station RER at Reunion Island, France. The observed seismogram is compared to its synthetic in time domain and three cartension components simultaneously. Synthetic seismogram is calculated with the GEMINI program, the initial inputs are the global earth models of Ocean and PREMAN. Prior to seismogram comparison, a low-pass filter with corner frequency of 20 mHz is imposed. The result of analysis shows a very strong deviation at the arrival time, oscillation amount and amplitude height of Love and Rayleigh surface waves and S body wave. To overcome the found discrepancies a correction to the earth structure is needed covering the earth crust thickness, speed gradient of f3~ and zero-order coefficient for the ~3b and ~ in upper mantle, and a little change in S speed in earth layers down to a depth of 400 km. Seismogram fitting is better obtained at waveform of the wave phase, either the travel time or oscillation number of S wave and Love surface wave. The results shows that the Indian Ocean has correction to the S speed structure, which is positive to standard earth model. This result differs from other seismology research.

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