Identifikasi Alur Purba Berdasarkan Seismik Pantul Dangkal Di Perairan Bangka Utara Lembar Peta 1114

Raharjo, Purnomo; Arifin, Lukman

doi:10.32693/jgk.5.3.2007.144

Cited by 4 publications

(6 citation statements)

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“…Seismic reflection profiles used in this study comprise over 9000 kilometers of sparker profiles acquired by Marine Geology Institute of Indonesia using RV Geomarin I during 1991 -1993 cruises ( Figure 2). The seismic system used is a single channel 500 Joule sparker system, firing rate every 1 second (Raharjo and Arifin, 2007;Susilohadi and Soeprapto, 2015). The seismic profiles were then filtered by band pass filter (80-120, 800-1200 Hz) before interpreted.…”

Section: Methodsmentioning

confidence: 99%

Seismic Facies of Pleistocene–Holocene Channel-fill Deposits in Bawean Island and Adjacent Waters, Southeast Java Sea

Albab¹,

Aryanto²

2017

BoMG

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The late Pleistocene-Holocene stratigraphic architecture of the Bawean Island and surrounding waters, southeast Java Sea has been analyzed by using sparker seismic profiles. Geological interpretation of these seismic profiles revealed the widespread distribution of paleochannels with different shape and size in the present-day Java Sea. Two channel types can be distinguished based on its morphology: U-shaped channels in the western part and V-shaped channels in the eastern part. The stratigraphic successions were grouped into two major seismic units separated by different seismic boundaries. Characters of marine and fluvial deposits were determined based on seismic boundaries and internal reflectors. Three seismic facies can be identified within late Pleistocene – Holocene incised channel fills associated with SB2. The internal structure of incised-channels consist of chaotic reflector at the bottom, covered by parallel–sub parallel and almost reflection-free indicating the homogenous sediment deposited during the succession.Keywords : Pleistocene-Holocene channel fills, sparker seismic profiles, seismic boundaries, incised–channel, Java Sea. Rekaman seismik sparker digunakan untuk menganalisis endapan stratigrafi berumur Plistosen Akhir–Holosen di Perairan Pulau Bawean dan sekitarnya. Berdasarkan interpretasi geologi dari rekaman seismik tersebut teridentifikasi sebaran alur purba yang berbeda bentuk dan ukuran dengan kondisi Laut Jawa sekarang. Berdasarkan morfologinya, dua tipe alur purba yang terdentifikasi adalah alur purba berbentuk U di bagian barat dan berbentuk V yang terbentuk di bagian timur daerah penelitian. Suksesi stratigrafi kemudian dibedakan menjadi dua grup unit seismik utama yang dibatasi oleh perbedaan batas seismik, yaitu endapan asal darat dan laut yang ditentukan berdasarkan batas sikuen dan reflektor internal. Pada unit Pleistosen–Holosen teridentifikasi tiga tipe fasies seismik yang berkorelasi pada batas sikuen SB2. Struktur internal alur purba yang tertoreh terdiri dari reflektor kaotik yang di bagian bawah, kemudian ditutupi oleh reflektor paralel - sub paralel sampai hampir bebas refleksi yang mengindikasikan terendapkannya sedimen homogen selama suksesi tersebut.Kata kunci : Pengisi alur Plistosen - Holosen, penampang seismik sparker, batas seismik, alur tertoreh, Laut Jawa.

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Section: Methodsmentioning

confidence: 99%

Seismic Facies of Pleistocene–Holocene Channel-fill Deposits in Bawean Island and Adjacent Waters, Southeast Java Sea

Albab¹,

Aryanto²

2017

BoMG

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“…Bentuk likuifaksi dapat berupa kejadian seperti penurunan cepat (quick settlement), pondasi bangunan menjadi miring (tilting), atau penurunan sebagian (differential settlement) dan mengeringnya air sumur yang tergantikan oleh material non kohesif [2]. (Kiri) Peta zona kerentanan likuifaksi, Kemenesdm dan (Kanan) Geologi Regional Lembar Yogyakarta [3], lokasi penelitian di tunjukan dengan blok merah.…”

Section: Pendahuluanunclassified

“…Dalam penulisan ini untuk menganalisis nilai Magnitude Scaling Factor (MSF), persamaa yang dipakai adalah persamaan seperti berikut ini: Dimana Mw adalah Moment Magnitude gempa refrensi. Nilai CRR dengan besar Moment Magnitude selain dari 7.5, diperlukan faktor koreksi yaitu nilai MSF dan nilai Kσ dimana nilai Kσ adalah nilai koreksi tegangan total [3,8].…”

Section: Kesimpulanunclassified

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Potensi Likuifaksi Pada Perencanaan Pembangunan Gedung Di Desa Triharjo, Wates, Kulon Progo, D.I. Yogyakarta

Suciati¹,

Yudiantoro²,

Purwanto³

2022

Journal Technology of Civil, Electrical, Mechanical, Geology, M

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Bahaya ikutan gempa salah satunya adalah likuifaksi. Menyadari kondisi geologi ini pemerintah D.I. Yogyakarta mempertimbangkan dan memperhitungkan risiko dengan melakukan upaya mitigasi, salah satunya dengan mengkaji potensi bahaya likuifaksi pada rencana pembangunan Embarkasi Haji Yogyakarta di Desa Triharjo, Kecamatan Wates, Kabupaten Kulon Progo. Penelitian ini bertujuan untuk mengetahui karakteristik endapan aluvial terhadap potensi likuifaksi pada perencanaan pembangunan Gedung. Metode yang digunakan adalah metode deterministic dan probabilistic. Data yang digunakan adalah data geolistrik, muka air tanah, bor SPT, granulometri dan mekanika tanah. Hasil penelitian menunjukkan faktor keamanan terhadap likuifaksi lapisan 1 (0-1m) FS kritis di Mw 3.7, lapisan 2 (1–6m) FS kritis di Mw 4.5, lapisan 3 (6–9 m) FS kritis di Mw 3.8, lapisan 4 (9–13 m) FS kritis di Mw 3.5 dan lapisan 5 (13–20 m) FS kritis di Mw 3.0. Menginterpretasi likuifaksi daerah tersebut maka dalam pengembangan wilayah ini harus memperhatikan bahaya gempa dan bahaya likuifaksi.

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“…or unit 2 with a paleovalley or paleochannel shape. These characterizes (paleovalley/ paleochannel) showed alluvial deposits and generally has potential to contain placer minerals (Arifin, 2011;Raharjo, 2007).…”

Section: Introductionmentioning

confidence: 99%

Distribution of Subsurface Quaternary Sediment in South Bintan Island Waters as a Potential Heavy Mineral Placer or Rare Earth Element Deposit Based on Seismic Interpretation

Zulfikar

Nurdin

Aryanto

et al. 2021

BoMG

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Bintan Island is one of the areas traversed by the Southeast Asian granitoid belt which is known to have the potential for heavy mineral placer deposits. Due to the dwindling presence of heavy mineral placer deposits in land areas, it is necessary to look for the potential presence of heavy mineral placer deposits in water areas. Searching for placer heavy mineral deposits accomodation in these waters requires subsurface mapping.The method used in this subsurface mapping is a single channel seismic method with a total of 179 lines in the direction of northeast – southwest and west – east. The results of this seismic recording are then interpreted the boundaries of the seismic facies unit and distributed using the kriging method. Furthermore, the thickness calculates by using the assumption velocity 1600 m/s.Based on the facies unit boundaries that have been interpreted, the quaternary sediments that formed in the study area are divided into 2 types of units, namely: Unit 2 which is estimated to be fluvial – transitional sediment, and Unit 1 which is estimated to be transitional sediment – shallow sea. There is also a difference in thickness patterns in these two units, where unit 2 shows a pattern of sediment thickening that resembles a paleochannel trending northeast – southwest, while unit 1 is relatively uniform.From the results of this study, it can be said that the area that has potential for heavy mineral placer deposits is in the west - center of the southern waters of Bintan Island. Where the potential for heavy mineral placer deposits should be in the paleochannel deposits that are part of Unit 2.

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Identifikasi Alur Purba Berdasarkan Seismik Pantul Dangkal Di Perairan Bangka Utara Lembar Peta 1114

Cited by 4 publications

References 0 publications

Seismic Facies of Pleistocene–Holocene Channel-fill Deposits in Bawean Island and Adjacent Waters, Southeast Java Sea

Seismic Facies of Pleistocene–Holocene Channel-fill Deposits in Bawean Island and Adjacent Waters, Southeast Java Sea

Potensi Likuifaksi Pada Perencanaan Pembangunan Gedung Di Desa Triharjo, Wates, Kulon Progo, D.I. Yogyakarta

Distribution of Subsurface Quaternary Sediment in South Bintan Island Waters as a Potential Heavy Mineral Placer or Rare Earth Element Deposit Based on Seismic Interpretation

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