Abstrak

Baca Juga : IDENTIFIKASI SESAR SUMATRA SEGMEN ACEH BERDASARKAN METODE GRAVITASI 2D (Mutia Farza, 2015) ,

Baca Juga : IDENTIFIKASI STRUKTUR SESAR SUMATERA MENGGUNAKAN GEOMAGNMETIK DI KAWASAN ACEH BESAR (CINDY YORA NABILA, 2019) ,

89 m dan lintasan kedua 60 m memotong jalur sesar patahan sumatra di pulau weh. jarak antara kedua lintasan 24,5 m dan jarak antar titik pengukuran 1 m. pada penelitian ini data in-phase dan out-of-phase medan magnetik diukur pada dua stasiun pemancar gelombang elektromagnetik, yaitu ndt (17,4 khz.) dan jji japan (22,2 khz.). secara umum respon data pada dua frekuensi yang berbeda menunjukkan pola respon yang sama. gambaran struktur bawah permukaan didapatkan berdasarkan nilai rapat muatan dari software karous hjelt. hasil analisa menunjukkan adanya zona konduktif dan resistif. kontras area resistif dan konduktif secara vertikal menunjukkan adanya rekahan di bawah permukaan. kata kunci: very low frequency, in-phase, out-of-phase, rupture abstract weh island is one of the volcanic islands formed within a depressed segment of the great sumatran fault line in northwest sumatran. the process could cause natural disasters in the form of earthquakes. an active fault segment with very rare tectonic activity is a continues segment of seulimeum to weh island, sabang. energy accumulation could occur in the seulimeum segment. it is necessary to study the history of ancient earthquakes to determine the period of the earthquake. one way to identify the earthquake repetition period is based on the rupture of a shallow fault structure. one of the geophysical methods that can be used to determine the superficial fracture is the very low frequency (vlf-em) electromagnetic method. a study of shallow fault structures has been conducted in area cot abeuk weh island, sabang. there were two measurement lines with the first line of 89 m and the second line of 60 m crossing the line of sumatran fault on weh island. the distance between the two lines is 24.5 m and the distance between the measuring point is 1 m. in this study, in-phase and out-of-phase magnetic field data were measured on two electromagnetic wave transmitters station, i.e ndt (17.4 khz.) and jji japan (22.2 khz.). in general the data response on two different frequencies shows the same response pattern. an overview of the subsurface structure is obtained based on the value of the charge density of the software karous hjelt. the analysis results show the existence of conductive and resistive zones. the contrast of the resistive and conductive areas vertically indicates a fracture below the surface. keywords: very low frequency, in-phase, out-of-phase,

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