Hasil Pencarian  ::  Simpan CSV :: Kembali

"Landslide is a major hazard in large parts of indonesia especially in hilly and mountaineous terrain like kabupaten Trenggalek East Java. These phenomena have a geart potential to destroy terrain, properties and lives...."

"konang district has a problem on fresh water supply particularly in dry season. Two villages in the district, namely Pakes and Konang, are densely populated areas having agriculture activities, so available of sufficent fresh water in necessary. A fresh water source that can be developed in this area is deep groundwater source from potential aquifers. A geological study has been conducted to identify potential aquifer based on lithological aspect and geological structure. According to the regional stratigraphy, the study area consists of Tawun Formation and Ngrayong Formation. They compose of carbonaceous claystone (the oldest rock unit), carbonaceous claystone with sandy limestone intercalations, sandy limestone interbeded with carbonaceous claystone, tuffaceous sandstone with claystone intercalations, and reef limestone (the youngest) respectively. Strike and dip positions of the rocks layers are N110oE/22o - N150oE/26o, located on the south anticline axis with wavy plan to gentle slope of hilly morphology. Among the rock unit, only sandy limestone has fine sand with subangular in shape and open pack. Qualitatively, this rock has good porosity and parmeability and is enables to save and to flow subsurface water. Thrus, the sandy limestone is considered as a potensial zone for fresh water resources. Whereas, carbonaceous claystone with clay grainsize has low porosity and permeability, so it is potential as a cap rock"

"

---

ABSTRACTMapping closely to how ore deposit geology is now taught, this textbook systematically describes and illustrates the major ore deposit types, linking this to their settings in the crust and the geological factors behind their formation. Written for advanced undergraduate and graduate students with a basic background in the geosciences, it provides a balance of practical information and coverage of the relevant geological sciences, including petrological, geochemical, hydrological and tectonic processes. Important theory is summarized without unnecessary detail and integrated with students' learning in other topics, including magmatic processes and sedimentary geology, enabling students to make links across the geosciences. Students are supported by further reading, a comprehensive glossary, and problems and review questions that test the application of theoretical approaches and encourage students to use what they have learnt. A website includes visual resources and combines with the book to provide students and instructors with a complete learning package."

"Geoinorfologi adalah ilmu pengetahuan yang berkaitan dengan bentuk inedan sebagai bentuk muka bumi, baik di atas maupun di bawah muka air laut. Lingkup studi geoinorfologi meneakup beberapa aspek yaitu bentuk medan, material penyusun dan proses geomorfologi. Gunung Ciremai merupakan gunung yang endapan vulkaniknya mengalir dan menutupi lapisan lipatan di bawahnya hingga meneapai Laut Jawa. Dan dari batuan lipatan tadi di beberapa teinpat menonjol. Pada lreng Baratdaya dan Utaranya terdapat suatu reruntuhan dari pegunungan tua. Penanikan wilayah penelitiari herdasarkan peta sketsa geologi Yang dibuat Van Beminelen' tahun 1941 dan secara asrononhis dibatasi pada 108°10' - 108°40'Bujur Timur dan 6°40 - 7°05 Lintang Selatan. Masalah yang akan dihahas adalah : Unit-unit geomorfologi apa saja yang terdapat di komplek Cirëmai ? Desknipsi wilayah dibahas menurut satuan unit geomorfologi berdasarkan analisis medan dan melalui pendekatari bentang alam. Analisis inedan yang digunakan adalah ketinggian, ketniringan lereng, jenis batuan, strdktur geologi dan pola aliran sungai. Dari hasil analisis peta dan fakta yang ada, maka di wilayah penelitian dapat dibuat ringkasan unit geomorfologi yaitu Di wilayah kikisan terdapat (1) Unit Gunungapi yang terdiri dari gunung api, bukit intrusif, undak lava, dataran fluvial vulkanik dan gunungapi tendenudasi. (2) Unit Lipatan yang terdiri dari pegunungan lipatan, perbukitan upstart dan dataran lipatan. (3) Unit Patahan yang terdini dari pegunungan patahan, perbukitan patahan dan gawir sesar. (4) Unit Perbukitan Tenkikis. Di wilayah endapan terdapat : (1) Unit Dataran Aluvial yang teriri dari dataran aluvial Cirebon, dataran aluvial Ci Senggarung, dataran aluvial Cikijing, dataran aluvial Kadipaten, danau, beting, tanggul sungal dart dataran banjir. (2) Unit Dataran Aluvial Mann yang terdiri dari dataran aluvial mann Cirebon, rataan pasang surut, tanggui pantai dan delta."

"Indonesia mempunyai potensi geologi yang menarik untuk investasi di bidang pertambangan mineral dan batubara. Tetapi potensi geologi hanya merupakan salah satu faktor yang dapat dipertimbangkan untuk investasi di bidang pertambangan, karena masih banyak faktor lain yang perlu dipertimbangkan.Investasi bidang pertambangan mineral dan batubara di Indonesia pada kurun waktu tahun terakhir ini mengalami penurunan, karena tidak ada investasi baru yang dilakukan oleh investor.Untuk mengetahui faktor-faktor yang menyebabkan terjadinya penurunan investasi bidang pertambangan mineral dan batubara, akan dianalisa dengan menggunakan Proses Hirarki Analitik. Selanjutnya dari hasil analisis akan diusulkan usul atau saran-saran untuk meningkatkan investasi bidang pertambangan mineral dan batubara.

---

Indonesia has an attractive geology potential for investment to mineral and coal-mining sector. However, potential geology is only one of factors able be considered to investment at mining sector, because there are many factors that should be taken into account.Investment at mineral and coal mine sector in Indonesia within nowadays era it has decreased, because there is no new investment undertook by the investors.To understand some factors that cause the occurrence of decreasing to investment at mineral and coal-mining sector should be analyzed with Analytic Hierarchy Process. Further from results of the analysis will be proposed suggestion and proposal to increase the investment in sector of mineral and coal-mining sector."

"Migrasi Seismik adalah suatu proses untuk memindahkan kedudukan reflektor pada posisi dan waktu pantul yang sebenarnya berdasarkan lintasan gelombang. Hal ini disebabkan karena penampang seismik hasil stack belumlah mencerminkan kedudukan yang sebenarnya, karena rekaman normal incident belum tentu tegak lurus terhadap bidang permukaan, terutama untuk bidang reflektor yang miring. Selain itu, migrasi juga dapat menghilangkan pengaruh difraksi gelombang yang muncul akibat adanya struktur-struktur tertentu.Migrasi yang digunakan adalah migrasi Kirchhoff, dimana keberhasilan dari migrasi Kirchhoff sangat dipengaruhi oleh model velocity yang digunakan untuk melakukan migrasi, lebar aperture, maximum dip to migrate, serta penggunaan frekuensi tertentu sehingga migrasi yang dilakukan dapat menghasilkan penampang seismik yang mendekati struktur geologi yang sebenarnya. Serta dilakukan analisis lebih lanjut didalam penentuan lebar aperture dan penentuan maximum dip to migrate yang digunakan.

---

Seismic Migration is a process to relocate position of a reflector to its true geology structure in the subsurface. The different image between the stacked section and true subsurface position of the event, because the record of normal incidence is not always perpendicular to its reflector, especially a reflector with a certain dip. Migration also can collapse a diffraction that appears if there is a point diffractor in the subsurface.One of the method that will be used in this thesis is Kirchhoff migration. The success of Kirchhoff migration is dependent on the aperture width, maximum dip to migrate, and frequency that is used for migration so the result of migration can represent the true subsurface geology structure. In this thesis is also discussed about aperture analysis, and maximum dip analysis."