AMPLIFICATION OF SEISMIC WAVES IN ALLUVIUM DEPOSITS

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RIAHI M.A.; MAHDAVI ZAFARGHANDI A.R.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: Journal of the Earth and Space Physics Year:2001 | Volume:27 | Issue:2 Page(s): 7-14

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Title

AMPLIFICATION OF SEISMIC WAVES IN ALLUVIUM DEPOSITS

Author(s)

RIAHI M.A. | MAHDAVI ZAFARGHANDI A.R. | Issue Writer Certificate

Keywords

AMPLIFICATION FACTORQ4

ALLUVIUM DEPOSITSQ4

NAKAMURA'S METHODQ4

REFERENCE STATION METHODQ4

Abstract

In the present study seismic data was carried out at Bibi -Shahr Banoo mountainous area located in Shar-e-Ray south-east of Tehran to estimate amplification of seismic waves. For this purpose microtremors and explosion generated waves were acquired. The layout of three recording stations was arranged along a profile. Microtremors were recorded after midnight with time interval of 30 minutes; record length for each interval was 2 minutes. Explosion charges were about 120 kg of dynamite, and 850 kg of amfo. Three Protable Data Acquisition System (PDAS 100) recording stations along a profile with interval of 50 to 150 meters were deployed to record the seismic waves. Data was processed using Digital Signal Processing (DSP) software. Then the classical Spectrum ratio and Nakamura"s ratio methods have been evaluated. It should be noted that, all obtained results are reliable in frequency range of 0 to 10 Hertz. The obtained results were classified in four stages as follows: Microtremors: obtained AMPLIFICATION FACTOR, in average, from two recording stations using Nakamura's ratio method shows greater values than that of obtained from classic REFERENCE STATION METHOD. The obtained results for the used methods are summerised as the following; Explosion: The above result was obtained the same, while explosion was used as a source. NAKAMURA'S METHOD: In comparison between microtremors and explosion generated waves, the NAKAMURA'S METHOD, in average resulted greater AMPLIFICATION FACTOR while explosion was used as a source. Classic REFERENCE STATION METHOD: In comparison between microtremors and explosion, classic REFERENCE STATION METHOD, in average resulted greater AMPLIFICATION FACTOR while explosion was used as a source.

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APA: Copy

RIAHI, M.A., & MAHDAVI ZAFARGHANDI, A.R.. (2001). AMPLIFICATION OF SEISMIC WAVES IN ALLUVIUM DEPOSITS. JOURNAL OF THE EARTH AND SPACE PHYSICS, 27(2), 7-14. SID. https://sid.ir/paper/80675/en

Vancouver: Copy

RIAHI M.A., MAHDAVI ZAFARGHANDI A.R.. AMPLIFICATION OF SEISMIC WAVES IN ALLUVIUM DEPOSITS. JOURNAL OF THE EARTH AND SPACE PHYSICS[Internet]. 2001;27(2):7-14. Available from: https://sid.ir/paper/80675/en

IEEE: Copy

M.A. RIAHI, and A.R. MAHDAVI ZAFARGHANDI, “AMPLIFICATION OF SEISMIC WAVES IN ALLUVIUM DEPOSITS,” JOURNAL OF THE EARTH AND SPACE PHYSICS, vol. 27, no. 2, pp. 7–14, 2001, [Online]. Available: https://sid.ir/paper/80675/en

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