Identifikasi Sesar Grendulu Menggunakan Inversi Data Very Low Frequency Electromagnetic (VLF-EM)

Putra, Akhmad Rifki Cahya (2018) Identifikasi Sesar Grendulu Menggunakan Inversi Data Very Low Frequency Electromagnetic (VLF-EM). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sesar Grendulu merupakan sesar aktif yang ada di Kabupaten Pacitan. Keberadaannya harus diketahui untuk meminimalisir potensi kerusakan bangunan akibat aktivitas Sesar Grendulu. Oleh karena itu, identifikasi Sesar Grendulu perlu dilakukan melalui inversi data Very Low Frequency Electromagnetic (VLF-EM). Data VLF-EM (In-Phase dan Quadrature) dianalisa menggunakan metode Noise Assisted Multivariate Empirical Mode Decompostition (NA-MEMD) untuk mereduksi noise pada data pengukuran. Proses selanjutnya, data pengukuran dianalisa filter Fraser dan filter Karous Hjelt dan diinversi untuk analisa kuantitatif. Analisa kualitatif digunakan untuk identifikasi posisi lateral anomali, sedangkan analisa kuantitif digunakan untuk identifikasi posisi kedalaman dan lateral suatu anomali. Hasil inversi berupa resistivitas 2D yang selanjutnya dari beberapa lintasan dibuat model resistivitas 3D. Sesar Grendulu ini memiliki resistivitas konduktif dengan nilai antara 0 – 120 Ωm. Dari model resistivitas 3D dapat menunjukkan arah dan posisi Sesar Grendulu, yakni mulai dari arah Timur laut menuju arah Barat Daya dengan arah sudut SW 225°.
===========================================================================Grendulu Fault is an active fault in Pacitan Regency. Its existence must be known to minimize the potential for building damage due to Grendulu fault activities. Therefore, it is necessary to identify the Grendulu fault using inversion in Very Low Frequency Electromagnetic (VLF-EM) data. VLF-EM (In-phase and Quadrature) data were analyzed using the Noise Assisted Multivariate Empirical Decompostition Mode (NA-MEMD) to reduce noise in the measurement data. The next process, measurement data is analyzed by Fraser filters and Karous Hjelt filters and inverted for quantitative analysis. Qualitative analysis is used to identify lateral position anomalies, while quantitive analysis is used to identify depth and lateral positions of anomalies. The inversion results in the form of 2D resistivity, then from several lines a 3D resistivity model is created. Grendulu fault has conductive resistivity with values between 0 - 120 Ωm. From the 3D resistivity model it can show the direction and position of the Grendulu Fault, which starts from the Northeast towards Southwest with a angle direction is SW 225°.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Sesar Grendulu, NA-MEMD, Fraser, Karous Hjelt, Inversi VLF-EM.
Subjects:	Q Science > QC Physics Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Natural Science > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Akhmad Rifki Cahya Putra
Date Deposited:	01 Jul 2025 02:38
Last Modified:	01 Jul 2025 02:39
URI:	http://repository.its.ac.id/id/eprint/60783

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