Fikriyah, Vareyna Tsamrotul (2023) Analisis Particle Motion Data Mikrotremor di Daerah Karst Pacitan Bagian Barat untuk Identifikasi Sungai Bawah Permukaan. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Metode geofisika merupakan metode yang dianggap efektif dalam mengidentifikasi keberadaan sungai bawah permukaan. Pendekatan metode geofisika yang diterapkan dengan memanfaatkan perekaman data mikrotremor tiga komponen dengan titik pengukuran yang berlokasi di Luweng Dawung-Luweng Musuk, Desa Sekar, Kec. Donorojo, Pacitan. Prinsip kerja pada penelitian ini berdasarkan analisis particle motion yang dianalisis menggunakan PCA (Principal Component Analysis) yaitu dengan mengkarakterisasi elliptical ground motion dimana parameter yang didapatkan berupa nilai eigen, vektor eigen, nilai rectilinarity (L) dan nilai dip juga nilai azimuth sebagai dasar pemodelan particle motion untuk memetakan sungai bawah permukaan. Pemetaan sungai bawah permukaan berdasarkan arah particle motion di plotting pada komponen horizontal untuk mengetahui kemenerusan sungai bawah permukaan, sedangkan parameter nilai eigen dan nilai rectilinearity (L) yang dipetakan bertujuan untuk mengetahui hubungan parameter tersebut dengan keberadaan sungai bawah permukaan. Berdasarkan hasil pengolahan, pola kemerusan sungai bawah permukaan mengarah dari timur laut-barat daya (NE-SW), sedangkan hasil korelasi particle motion dengan hasil pemetaan langsung menunjukkan bahwa pola orientasi arah particle motion menunjukkan pola tegak lurus terhadap sumber getaran yang diindentifikasikan sebagai sungai bawah permukaan. Adapun hasil pemetaan nilai eigen dan nilai rectilinearity (L) tidak menunjukkan korelasi dengan keberadaan sungai bawah permukaan.
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Geophysical methods are considered effective in identifying the presence of underground rivers. The geophysical approach applied in this study involves recording three-component microtremor data at measurement points located from Luweng Dawung-Luweng Musuk, in Sekar Village, Donorojo District, Pacitan. The research principle is based on the analysis of particle motion using PCA (Principal Component Analysis), which characterizes elliptical ground motion. The obtained parameters include eigenvalues, eigenvectors, rectilinearity (L) values, dip values, and azimuth values, which serve as the basis for modeling particle motion to map underground rivers. The mapping of the underground river is based on the direction of particle motion plotted on the horizontal component to determine the continuity of the underground river. Meanwhile, the eigenvalue and rectilinearity (L) parameters are mapped to investigate their relationship with the presence of underground rivers. Based on the processing results, the pattern of underground river continuity appears to be oriented from the northeast to the southwest (NE-SW). The correlation between particle motion and direct mapping results indicates that the orientation of particle motion is perpendicular to the identified source of vibrations, which is the underground river. However, the mapping results of eigenvalues and rectilinearity (L) show no correlation with the presence of underground rivers.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Karst, Mikrotremor, Particle Motion, Sungai Bawah Permukaan; Karst, Microtremor, Particle Motion, Underground River |
| Subjects: | G Geography. Anthropology. Recreation > GB Physical geography > GB1003.2 Groundwater. G Geography. Anthropology. Recreation > GB Physical geography > GB600 Karst conservation. Q Science > QE Geology > QE538.8 Earthquakes. Seismology |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Vareyna Tsamrotul Fikriyah |
| Date Deposited: | 05 Oct 2023 04:07 |
| Last Modified: | 05 Oct 2023 04:07 |
| URI: | http://repository.its.ac.id/id/eprint/103226 |
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