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Seismogram Analysis of Indonesian Ea

時間:2023-04-27 16:20:30 天文地理論文 我要投稿
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Seismogram Analysis of Indonesian Earthquakes at DAV Observation Station

The S-wave velocity across the earth structure under Indonesia for Indonesia earthquakes has been investigated through seismogram analysis, simultaneously in the time domain and three Cartesian components. The data were recorded at DAV observational station, the Philippines. The main data set is the seismogram comparison between the measured and synthetic seismogram, instead of travel time data, as commonly used in other seismological research. The synthetic seismogram is calculated using the GEMINI method, which is equivalent to Mode Summation.The above seismogram comparison shows that the global earth mantle of PREMAN gives a deviating synthetic seismogram and has earlier arrival times than those of the measurement. The gradient of βh in the upper mantle layers is altered into a positive, rather than negative slope as stated in the PREMAN model, and negative corrections are imposed to the zero order of the polynomial's coefficients in all earth mantle layers. The excellent fitting, as well as travel time or waveform, is obtained from the surface waves of Love and Rayleigh, surface wave to the S and SS mantle waves as well as the core reflected waves.This result expresses that part of the earth mantle, due to a collision between India and Asia tectonic released zones, has a negative anomaly in S-wave velocity and vertical anisotropy in all of the earth mantle layers.

作 者: Bagus Jaya Santosa   作者單位: Prodi Geofisika, FMIPA, ITS, Surabaya 60111, Indonesia  刊 名: 中國地震研究(英文版)  英文刊名: EARTHQUAKE RESEARCH IN CHINA  年,卷(期): 2009 23(2)  分類號: P3  關(guān)鍵詞: Seismogram analysis   Vertical anisotropy   Negative velocity anomaly  

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