The paper deals with the modelling of seismo-electromagnetics disturbance on the crustal earth by use of threedimensional (3D) finite-difference time-domain (FDTD) method. The model is built up by discretizing the frontier geographical region between Java Island and Sumatra Island in a cylindrical coordinate system-based 3D object. The proposed method is applied to compute and analyze electromagnetics (EM) fields of the observed very low frequency (VLF) wave used for the investigation. Boundary condition of uniaxial perfectly matched layer (UPML) are applied surrounding the area of computation for truncating the object of simulation. The investigation are focused on the propagation time of observed VLF wave and its amplitude variation between the observation point and disturbance pulse. The result shows that the propagation time is significantly affected by the distance of observation point and the permittivity of propagation medium. Meanwhile, the addition pulse associated with the earthquake influences the amplitude of observed VLF wave instead of its frequency.

Bahasa Abstract

Metode FDTD 3D untuk Pemodelan Gangguan Seismo-elektromagnetik pada Kerak Bumi. Penelitian ini bertujuan untuk memodelkan fenomena seismo-electromagnetics dengan metode finite-difference time-domain (FDTD) tiga dimensi (3D). Pemodelan dibangun dengan mendiskretisasi peta geografis pada perbatasan antara Pulau Jawa dan Pulau Sumatra dalam bentuk 3D berbasis koordinat silinder. Metode yang diusulkan digunakan untuk menghitung dan menganalisis medan elektromagnetik (EM) pada pengamatan gelombang frekuensi Very Low Frequency (VLF) yang digunakan dalam investigasi. Kondisi batas Uniaxial Perfectly Matched Layer (UPML) digunakan pada sekeliling area komputasi untuk membatasi objek simulasi. Investigasi difokuskan pada pengamatan waktu propagasi dan variasi amplitudo gelombang antara titik pengamatan dan sumber gangguan. Hasil penelitian menunjukkan bahwa waktu propagasi sangat dipengaruhi oleh jarak titik pengamatan dan permitivitas dari medium propagasi. Adapun penambahan gelombang pulsa yang diasosiasikan sebagai gempa bumi berpengaruh hanya terhadap amplitudo gelombang VLF yang diamati dan bukan terhadap frekuensinya.


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