Geologi dan studi kerentanan gerakan tanah daerah Karangluas dan sekitarnya, kecamatan Kemiri, kabupaten Purworejo, provinsi Jawa Tengah

Faisal Rizaldi Limonu, Faisal Rizaldi (2023) Geologi dan studi kerentanan gerakan tanah daerah Karangluas dan sekitarnya, kecamatan Kemiri, kabupaten Purworejo, provinsi Jawa Tengah. Other thesis, Institut Teknologi Nasional Yogyakarta.

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Abstract

Pada daerah penelitian terdapat 3 satuan geomorfologi yaitu satuan topografi perbukita denudasional (D2), satuan geomorfologi topografi bergelombang kuat-perbukitan denudasional (D1), satuan geomorfologi topografi perbukitan struktural. Stratigrafi daerah penelitian terdapat 4 satuan yaitu : satuan batuan batulempung Halang dengan umur N16-N18, satuan batuan batupasir karbonatan Halang dengan umur N18-N20, satuan batuan batupasir Halang, satuan batuan breksi polimik Peniron. Struktur geologi pada daerah penelitian yaitu sesar mendatar mengkanan Rebung dan sesar mendatar mengkiri Kaliurp. Geologi lingkungan di daerah penelitian memiliki aspek positif berupa sumberdaya alam yaitu berupa perkebunan dan pertanian, dan sumberdaya bahan galian. Sedangkan aspek negative di daerah penelitian berupa bencana alam tanah longsor. Analis kerentanan gerakan tanah menggunakan metode pembobotan menurut (A.M.Rusli,2013) dengan beberapa variabel yaitu kemiringan lereng, tataguna lahan, litologi, dan struktur geologi sehingga didapatkan hasil tingkat kerentanan gerakan tanah pada daerah penelitian yaitu : zona kerentanan gerakan tanah rendah dengan bobot 6, zona kerentanan gerakan tanah sedang dengan bobot 18, zona kerentanan gerakan tanah tinggi dengan bobot 22.

Kata kunci : Geologi, Geomorfologi, Gerakan Tanah







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ABSTRACT

In the study area there are 3 geomorphological units, namely denudational hills topography unit (D2), denudational hills topography unit (D1), structural hills topography geomorphology unit. The stratigraphy of the research area has 4 units, namely: Halang mudstone rock unit with the age of N16-N18, Halang carbonate sandstone rock unit with the age of N18-N20, Halang sandstone rock unit, Peniron polymict breccia rock unit. Geological structures in the study area are the Rebung right slip fault and Kaliurip left slip fault. Environmental geology in the study area has positive aspects in the form of natural resources in the form of plantations and agriculture, and excavation resources. While the negative aspects in the research area are in the form of landslides. Analysis of ground motion vulnerability using the weighting method according to (A.M.Rusli, 2013) with several variables namely slope, land use, lithology, and geological structure so as to obtain the results of the level of vulnerability of ground motion in the study area, namely : low ground motion vulnerability zone with a weight of 6, moderate ground motion vulnerability zone with a weight of 18, high ground motion vulnerability zone with a weight of 22.

Keyword : Geology, Geomorphology, Ground movement

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