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GEOLOGI BAWAH PERMUKAAN DASAR LAUT BERDASARKAN PENAFSIRAN REKAMAN SEISMIK PANTUL DANGKAL SALURAN TUNGGAL DI PERAIRAN SELAT SUNDA
Get PDFPenelitian ini bertujuan untuk mengetahui kondisi geologi bawah permukaan dasar laut dengan metode seismik pantul dangkal saluran tunggal, dan pemeruman. Seismik stratigrafi daerah penelitian dapat dibedakan menjadi 3 (tiga) unit, yaitu Unit 1 diinterpretasikan sebagai batuan intrusi, Unit 2 yang dekat dengan Pulau Jawa sebagai batuan volkanik dan yang dekat dengan Pulau Sumatera diduga sebagai Formasi Lampung, dan batuan lava andesit, serta Unit 3 diinterpretasikan sebagai sedimen Kuarter. Kedalaman permukaan dasar yang dapat direkam berkisar antara -5 hingga -125 meter dengan perubahan yang terjadi secara bergradasi dari arah pantai ke laut.
Kata kunci : Morfologi permukaan dasar laut, seismik stratigrafi, geologi bawah permukaan, Selat Sunda
The aims of study is to determine the subsurface geology condition of Sunda Strait by using single channel shallow seismic reflection, and the sounding method. Seismic stratigraphy of the study area can be divided into three (3) units, those are Unit 1, interpreted as intrusive rocks, Unit 2, which is close to Java be expected at volcanic rocks and the adjacent of Sumatera island interpreted Lampung Formation and andesitic lava rock, while Unit 3 as suspected Quaternary sediments. The sea floor depth that can be recorded ranging from -5 to -125 metres with the changes depth gradually from the shore to the sea.
Keywords : Seafloor morphology, seismic stratigraphy, subsurface geology, Sunda Strai
TINJAUAN GEOLOGI KELAUTAN PERAIRAN SEMENANJUNG MURIA TERHADAP RENCANA TAPAK KONSTRUKSI PLTN
Get PDFSemenanjung Muria terletak di pantai utara Kabupaten Jepara, Provinsi Jawa Tengah. Daerah ini akan dikembangkan menjadi daerah tapak Pembangkit Listrik Tenaga Nuklir (PLTN). Secara geologi, di daerah ini berkembang berbagai fenomena geologi seperti struktur sesar, gunungapi dan kegempaan.
Berdasarkan hasil interpretasi rekaman seismik pantul di perairan Semenanjung Muria menunjukkan adanya struktur sesar pada penampang Lintasan L-1 dan L-3. Struktur sesar tersebut terbentuk pada Sekuen B dan di bawah Sekuen A.
Adanya struktur sesar di laut tersebut perlu mendapat perhatian dalam perencanaan tapak kontruksi PLTN Muria, sehingga aspek yang dapat membahayakan konstruksi dapat diperhitungkan sebelumnya terhadap perencanaan kekuatan dan stabilitas konstruksi.
Kata kunci : sesar, seismik pantul, perencanaan konstruksi, Semenanjung Muria.
Muria Peninsula is located at the north coast of Jepara District, Central Java Province. This area will be developed for the foundation of Nuclear Energy Electrics Powers Station. Geologically, the study area has some geological phenomena such as fault structures, earthquakes and volcanisms.
Based on seismic interpretation the Muria Peninsula waters shows the occurence of faults on L-1 and L-3. The fault structure formed at Sequence B and under Sequence A as a Quaternary sediment.
These faults are seemly the continuation of faults present on land. Therefore, the construction of Muria station should be considered regarding the occurrence of these faults especially in the planning of stability and strength of foundation.
Keyword : faults, reflection seismic, planning of construction, Muria Peninsula
POTENSI WISATA BAHARI DITINJAU DARI ASPEK GEOLOGI DAN GEOFISIKA KELAUTAN DI PERAIRAN MUARA SAMBAS, KALIMANTAN BARAT
Get PDFPerkembangan Kota Kecamatan Pemangkat tampak sangat pesat karena kota tersebut sebagai kota penyangga pelabuhan laut di Muara Sungai Sambas. Disamping sebagai kota tujuan bisnis, Pemangkat juga memiliki pantai yang indah serta unik diantaranya di sebelah utara Muara Sungai Sambas yaitu di Desa Jawae dan di Tanjung Batu di sebelah selatan Muara Sungai Sambas.
Di Desa Jawae pantainya berpasir berwarna putih keabuan, dengan lebar paras muka pantai berkisar 15 - 25 meter, serta dibelakang garis pantainya ditumbuhi pohon bakau dan ketapang. Perubahan kedalaman perairan berangsur dari kedalaman 0,5 meter sampai 11 meter, dengan air laut yang masih jernih. Pelamparan pasir ke arah laut sekitar 300 meter mencapai kedalaman 2 meter. Pantai ini sangat cocok dikembangkan untuk wisata pantai.
Di Tanjung Batu pantainya bertebing serta dialasi batuan yang sangat kompak dan pejal. Dibeberapa tempat batuan dasar pantainya terlihat hitam mengkilap karena gerusan ombak serta memantulkan cahaya matahari oleh mineral-mineral yang terkandung di dalam batuan tersebut. Pantai ini telah berkembang menjadi daerah tujuan wisata karena keunikannya serta letaknya yang strategis dan dekat dari jangkauan lalu lintas umum .
The developing of Pemangkat City was very rapidly because that city as a buffer city of Sambas Harbour. Biside as a bisnis destination, Pemangkat city has a beautiful beach and unique such as in Jawae located in the northern of Mouth Sambas River and Tanjung Batu in the southern of Mouth Sambas River.
Sand beach of Jawae is white to grey, with wide berm was about 15 to 25 meters and in the back of coastal line were growth by mangrove and ketapang trees.
Depth changes of study area was very gradually from 0,5 meter to 11 metres depth and sea water was still purity. Distribution of the sand to the sea ward from coast line was about 300 metres untill 2 meters water depth. This beach is very suitable for developing to be beach tourism object.
The Beach In Tanjung Batu was steeping beach wich is based by masive rocks and very campact. In some places besement rock of the beach looking black glance caused by waves eroded, and reflecting the sun shine by black minerals which is acquired within the basement rock.
This beach had developed to be a beach tourism object because its unique and locally strategic, near from reaching public transportations
STRATIGRAFI SEISMIK LAUT DANGKAL PERAIRAN CELUKANBWANG, BALI UTARA
Get PDFSuvai seismik laut sepanjang pantai dan lepas pantai Celukanbawang Bali Utara dimaksudkan untuk mendapatkan data rekaman seismik guna menerangkan kondisi geologi daerah telitian. Berdasarkan pendekatan stratigrafi seismik, rekaman data seismik menunjukkan bahwa di daerah telitian terdapat 2 (dua) runtunan seismik, yaitu runtunan A dan B. Runtunan A diduga merupakan batuan volkanik sedangkan runtunan B diduga merupakan batuan sedimen yang diendapkan dalam lingkungan energi cukup kuat. Pada daerah slope break banyak dijumpai diapir, dan struktur geologi yang berkembang di daerah telitian adalah sesar normal.
The marine seismic survey along the coast and offshore of Celukanbawang, North Bali, was directed to obtained seismic records to explain the geological condition of the study area. On the basis of seismic stratigraphy approach, the seismic records indicate that in the study area presence 2 (two) seismic sequences, those are sequence A and B. Sequence A is suggested as a volcanic rocks while sequence B is suggested as sedimentary rocks deposited within strong energy environment. At the slope break area the diapers were found, and the geological structures develope in the study area are normal faults
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
POTENSI OBJEK WISATA PANTAI DAN BAHARI DI PERAIRAN UTARA LOMBOK DITINJAU DARI ASPEK GEOLOGI KELAUTAN
Get PDFDaerah penelitian dengan latar belakang Gunung Rinjani yang indah, memiliki potensi untuk dikembangkan sebagai daerah tujuan wisata pantai seperti Karang Bedil, Sesait, Desa Salangan, Sukadana, Tanjung Batu, Sungian, Labuhan Pandan, serta pantai timur Pulau Gili Sulat dan Gili Lawang. Untuk kegiatan wisata snorkling, diving dan surfing tempat yang baik adalah di Tanjung Awar-awar, Tanjung Menangis dan Tanjung Batu. Olah raga surfing (selancar air) disarankan sebaiknya dilakukan antara Bulan Oktober – Mei.
Dalam membangun sarana penunjang di kawasan wisata pantai dan bahari faktor yang penting adalah memberikan perhatian khusus dalam menjaga kelestarian lingkungan daerah tujuan wisata, agar keaslian alam yang ditawarkan kepada wisatawan tetap asli.
Kata kunci: Karakteristik pantai, sebaran sedimen permukaan dasar laut, batimetri, dan perubahan garis pantai.
The study area, with the background of the beautiful Mount Rinjani, has a potency to develop as a coastal tourism such as Karang Bedil, Sesait, Desa Salangan, Sukadana, Tanjung Batu, Sungian, Labuhan Pandan, and the east coast of Gili Sulat and Gili Lawang Islands. For snorkling, diving and surfing the nice place is in Tanjung Awar-awar, Tanjung Menangis and Tanjung Batu. The right time for snorkling sport should be conducted between October - May.
To build the supporting facilities in the coastal and venerable tourism objects, the important factor is to pay a special attention for keeping the everlasting environment of the tourism object destination, so that the original of nature which is offering to the tourists is still pristine.
Keywords: coastal characteristic, sea floor surficial sediment, bathymetry and coastline chnge
INDIKASI KEBERADAAN GAS BIOGENIK DI DELTA SUNGAI CIMANUK BERDASARKAN DATA SEISMIK DAN BOR INDRAMAYU, JAWA BARAT
Get PDFHasil interpretasi seismik di daerah penelitian, dijumpai adanya indikasi rembesan gas dari bawah permukaan dasar laut yang membawa material sedimen sangat halus. Hal tersebut memperjelas bahwa di daerah lepas pantai gas yang terbentuk di dalam sedimen dan tidak terperangkap.
Analisis bakteri semua percontoh bor inti, menunjukkan semua percontoh mengandung bekteri pembentuk gas biogenik (methan). Gas biogenik juga keluar dari sumur air penduduk di desa Brondong dan Pasekan, dengan kedalaman berkisar antara 100 – 150 meter.
Kata kunci : delta, seismik, sumur bor, dan gas
Seismic interpretation from the surveyed area indicate a gas seep from the sea floor together with the very fine sediment materials. It is olso indicates that the gas formed underneath are untrapped. Bacterical analyses from whole core samples, indicate that all samples contain of bacterical forming biogenic gas (methane gas). The gas are olso seeping from several wells in Desa Brondong and Pasekan at 100-150 meters depth.
Keywords : delta, seismic, well, and ga
POTENSI AGREGAT SERTA DAMPAK YANG TIMBUL BILA DILAKUKAN EKSPLOITASI DI PANTAI DAN LEPAS PANTAI MUARA SUNGAI SAMBAS KALIMANTAN BARAT
Get PDFBerdasarkan hasil analisis besar butir menunjukan bahwa jenis sedimen permukaan dasar laut daerah penelitian terdiri dari 4 jenis sedimen yaitu lanau, lanau pasiran, pasir lanauan dan pasir. Sedangkan jenis agregat yang dijumpai adalah berupa jenis agregat kasar yaitu pasir dan batu belah. Pasir adalah salah satu jenis agregat di daerah penelitian dan ditemukan bersama-sama dengan batu belah.
Agregat pasir tersebar di bagian utara daerah penelitian dengan luas sebaran sekitar 2,238 km2 sementara di bagian selatan daerah penelitian, pasir tersebar di pantai Tanjung Bila diperkirakan menerus ke laut dengan luas sebaran kurang lebih 2,189 km2.
Agregat berupa batu belah yang dijumpai adalah sebagai batuan beku terobosan berupa andesit, dasit, granodiorit, gabro dan basal. Dibagian utara daerah penelitian agregat batu belah dijumpai di Tanjung Kalangbau berupa bukit kecil dengan ketinggian sekitar 20 meter dengan luas sebaran 0,7079 km2 . Di bagian selatan agregat batu belah terdapat di Tanjung Batu berupa bukit kecil dengan sebaran kurang lebih 0,2920 km2.
Pemanfaatan agregat pasir di daerah penelitian akan menjadi masalah jika tidak terekomendasi. karena akan mengganggu kesetimbangan pantai, seperti pantai akan terabrasi terutama saat musim barat.
Based on grain size analyses the surfacial sediment of the study area consist of 4 sediment types such as silt, silty sand, sandy silt, and sand. While the aggregates found in the surveyed area were coarse aggregate namely sand and broken stone. Sand is one of the aggregate in the study area and it is found together with broken stone.
Distribution of sand aggregate in the northern part of the study area covered the area about 2,238 km2, while in the southern part, at Tanjung Bila their distribution seemly continous to the sea and covered the area about 2,189 km2.
The broken stone found at the study area as an instrusive rock those are andesite, granodiorite, gabro and basalt. In the northern part of study area, the broken stones, found at Tanjung Kalabahu as a small hill about 20 meter high and cover the area about 0,7079 km2
While in the southern part of study area the broken stone found at Tanjung Batu and it covers the area about 0,2920 km2
The utilization of all agregates at the study area become a problem if it is not well recommended, it would disturbed the equilibrium of coast line, such as abration especially in west monsoon
ZONA SESAR DI PERAIRAN KALIMANTAN SELATAN (LP 1611)
Get PDFPenafsiran data rekaman seismik pantul dangkal daerah telitian memperlihatkan adanya struktur dangkal berupa sesar-sesar yang berarah timurlaut-baratdaya. Zona sesar tersebut terletak pada Zona Tektonik Muria-Meratus. Jika zona sesar ini dianggap aktif, maka perlu diperhatikan terutama untuk kontruksi lepas pantai.
Kata kunci: struktur dangkal, zona sesar, Muria-Meratus
Shallow seismic data interpretation indicate several fault structures in the study area. The direction of these faults is NE-SW and coincide with the Muria-Meratus Tectonic Zone. If this fault zone is assumed to be potentially active, then it need the attention especially for marine construction.
Key word: shallow structure, fault zone, Muria-Meratu
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