SPECTRUM AND TIME-FREQUENCY ANALYSIS TO CHARACTERIZE MICROTREMOR DATA IN SEPAKU SUB-DISTRICT, EAST KALIMANTAN

Rahmania Rahmania; Diantika Diantika; Rasmid Rasmid; Meidi  Arisalwadi; Febrian Dedi  Sastrawan

doi:10.29303/ipr.v7i2.282

SPECTRUM AND TIME-FREQUENCY ANALYSIS TO CHARACTERIZE MICROTREMOR DATA IN SEPAKU SUB-DISTRICT, EAST KALIMANTAN

Authors

Rahmania Rahmania , Diantika Diantika , Rasmid Rasmid , Meidi Arisalwadi , Febrian Dedi Sastrawan

DOI:

10.29303/ipr.v7i2.282

Published:

2024-03-06

Issue:

Vol. 7 No. 2 (2024)

Keywords:

Spectrum analysis, Time-frequency analysis, Microtremor

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Rahmania, R., Diantika, D., Rasmid, R., Arisalwadi, M. ., & Sastrawan, F. D. . (2024). SPECTRUM AND TIME-FREQUENCY ANALYSIS TO CHARACTERIZE MICROTREMOR DATA IN SEPAKU SUB-DISTRICT, EAST KALIMANTAN . Indonesian Physical Review, 7(2), 220–230. https://doi.org/10.29303/ipr.v7i2.282

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Abstract

Microtremor analysis has been done in the Sepaku Sub-District as a part of the New Capital City of Indonesia. This study aims to determine the characteristics of microtremors in the Sepaku Sub-District using Spectrum Analysis and Time-Frequency Analysis (TFA). Data in this study were taken using a seismometer on the 18 measurement points. The data were processed using default analysis from Geopsy software. Spectrum analysis and TFA used Fourier Transform to change time domain data into the frequency domain. Both analysis ways result in the characteristic microtremor data in the research area. The spectrum analysis data obtained shows two frequency ranges with maximum peaks: middle-frequency (5-8.8 Hz) and high-frequency (11.5-17.6 Hz). Afterward, the TFA shows similar results, where the characteristics of microtremor data are divided into two zones. The maximum peak occurs at the middle-frequency range of 5-10 Hz, and the high frequency ranges above 10 Hz

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SPECTRUM AND TIME-FREQUENCY ANALYSIS TO CHARACTERIZE MICROTREMOR DATA IN SEPAKU SUB-DISTRICT, EAST KALIMANTAN

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