Response spectra analysis of the modal summation technique verified by observed seismometer and accelerometer waveform data of the M6.5 Pidie Jaya Earthquake

7th AIC‐ICMR on Sciences and Engineering 2017

自然科学;工业技术

Irwandi^1,3 ; Rusydy, Ibnu^2,3 ; Muksin, Umar^1,3 ; Rudyanto, Ariska^4 ; Daryono^4

Physics Department, Syiah Kuala University, Banda Aceh, Indonesia^1

Geology Department, Syiah Kuala University, Banda Aceh, Indonesia^2

Tsunami and Disaster Mitigation Research Center, Syiah Kuala University, Banda Aceh, Indonesia^3

Indonesian Agency for Meteorology, Climatology and Geophysics, Indonesia^4

关键词: Amplification effects;    Complete calculation;    Emission spectrums;    Good correlations;    Modal summation techniques;    Sedimentary basin;    Spectral Estimation;    Structural modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/352/1/012026/pdf
DOI  :  10.1088/1757-899X/352/1/012026

来源: IOP

【 摘 要 】

Wave vibration confined in the boundary will produce stationary wave solution in discrete states called modes. There are many physics applications related to modal solutions such as air column resonance, string vibration, and emission spectrum of the atomic Hydrogen. Naturally, energy is distributed in several modes so that the complete calculation is obtained from the sum of the whole modes called modal summation. The modal summation technique was applied to simulate the surface wave propagation above crustal structure of the earth. The method is computational because it uses 1D structural model which is not necessary to calculate the overall wave propagation. The simulation results of the magnitude 6.5 Pidie Jaya earthquake show the response spectral of the Summation Technique has a good correlation to the observed seismometer and accelerometer waveform data, especially at the KCSI (Kotacane) station. On the other hand, at the LASI (Langsa) station shows the modal simulation result of response is relatively lower than observation. The lower value of the reaction spectral estimation is obtained because the station is located in the thick sedimentary basin causing the amplification effect. This is the limitation of modal summation technique, and therefore it should be combined with different finite simulation on the 2D local structural model of the basin.