Mineral Exploration of the Sea bed by Towed Sea bed Spectrometers

1983 ◽  
pp. 437-449 ◽  
Author(s):  
B.W. THOMAS ◽  
C.G. CLAYTON ◽  
V.V.C. RANASINGHE ◽  
I.M. BLAIR
Keyword(s):  
Mineral Exploration ◽  
Sea Bed

Mineral exploration of the sea bed by towed sea bed spectrometers

1983 ◽  
Vol 34 (1) ◽  
pp. 437-449 ◽  
Author(s):  
B.W. Thomas ◽  
C.G. Clayton ◽  
V.V.C. Ranasinghe ◽  
I.M. Blair
Keyword(s):  
Mineral Exploration ◽  
Sea Bed

ELECTROMAGNETIC INVESTIGATION OF THE SEA FLOOR

Geophysics ◽  
1970 ◽  
Vol 35 (3) ◽  
pp. 476-489 ◽  
Author(s):  
J. H. Coggon ◽  
H. F. Morrison
Keyword(s):  
Mineral Exploration ◽  
Skin Depth ◽  
Electromagnetic Response ◽  
Horizontal Magnetic Field ◽  
Electromagnetic System ◽  
Sea Floor ◽  
Sea Bottom ◽  
Sea Bed ◽  
Receiver System ◽  
Field Strengths

Numerical evaluation of integral expressions for the fields about a vertical magnetic dipole in the sea allows analysis of the electromagnetic response over wide ranges of sea induction number and sea floor conductivity. Our analysis indicates that a marine electromagnetic system for measurement of bottom conductivity variations could readily be designed, with such applications as oceanographic and geologic studies, and mineral exploration. For a source‐receiver system on a homogeneous sea bottom, it is found that: (i) when the ratio k=(sea‐bed conductivity)/(seawater conductivity) is greater than about 0.03, both horizontal and vertical magnetic fields are useful for measurement of bottom conductivity at sea induction numbers less than 30 [induction number =√2 (horizontal transmitter‐receiver separation/skin depth)]. A separation of 30 m and frequencies in the range 300–3500 hz appear suitable for investigation of the upper few meters of unconsolidated bottom sediments. (ii) When the ratio k is less than 0.03, sea induction numbers from 10 to a few hundred are required for detection of seabed conductivity variations. In this case, the horizontal magnetic field, resulting from energy transmission mainly through the seafloor, is the suitable field to use. Electromagnetic sounding of indurated rocks may thus call for frequencies of 100 to 20,000 hz at a separation of 200 m. Field strengths vary strongly with relative sea depth D/R (D=sea depth, R=horizontal source‐receiver separation) when D/R is small; but sensitivity to bottom conductivity is little affected by D/R. Elevation of source and receiver above a seafloor less conductive than seawater reduces field strengths and sensitivity to seabed properties.

ZONA EKONOMI EKSLUSIF (ZEE) DALAM POROS MARITIM DAN TOL LAUT

2018 ◽  
Author(s):  
Joko Dwi Sugihartono
Keyword(s):  
Deep Sea ◽  
Exclusive Economic Zone ◽  
National Unity ◽  
Logistics Cost ◽  
The Earth ◽  
Sea Bed ◽  
Sea Transportation ◽  
Economic Zone ◽  
The Law ◽  
Lack Of Knowledge

<p>in Indonesia is a region bordering the sea region of Indonesia determined by the law which included sea bed, land under it and water above it with the limit of 200miles. This is measured from Indonesian line of the sea.This whole time a lot of people see the shoreline as the sea border. This perspective makes us alienated and lack of knowledge to take advantage of the sea. This understanding also conjures the idea sea toll, to confirm that Indonesia is maritime country. Sea toll means building sea transportation with ships or sea logistic system which will serve nonstop back and forth from Sabang to Merauke. One of the factors to support this is by building ports (deep sea port) order to give faraway to big ships. A course that spreading as far as 5,000 kilometers or an eighth circumference of the earth One of the purposes of sea toll is to move the economy as efficient and evenly as possible. With the hope that, there will be ships back and forth on Indonesian water, so logistics cost will be cheap. That is why; sea toll is one of President Joko Widodo’s priorities which are also meant to develop Indonesia as maritime country and develop Indonesia as national unity. In addition sea toll can also be affirmation, that Indonesia is in every regions even if it is through ships.</p><p><strong>Keywords : Exclusive Economic Zone (ZEE) , Sea Toll , The Shaft Maritime, A Seaport</strong></p>

Investigation on sea-bed waste of Jeju north-eastern fishing grounds by bottom trawl

2018 ◽  
Vol 11 (1) ◽  
pp. 36-42
Author(s):  
Hyeong-Min KIM ◽  
Min-Ho YOU ◽  
Ji-Na GANG ◽  
Dae-Jin KIM ◽  
Hyeong-Ho SHIN
Keyword(s):  
Bottom Trawl ◽  
Sea Bed ◽  
North Eastern

Investigation of sea-bed waste in the coastal fishing grounds of Jeju island by bottom trawl

2019 ◽  
Vol 12 (1) ◽  
pp. 19-26
Author(s):  
Ju-Hun LEE ◽  
Chae-Gyeong JUNG ◽  
Hyeong-Ho SHIN ◽  
Dae-Jin KIM
Keyword(s):  
Jeju Island ◽  
Bottom Trawl ◽  
Sea Bed

Upernavik 98: reconnaissance mineral exploration in North-West Greenland

1999 ◽  
pp. 39-45 ◽  
Author(s):  
Bjørn Thomassen ◽  
Johannes Kyed ◽  
Agnete Steenfelt ◽  
Tapani Tukiainen
Keyword(s):  
Mineral Exploration ◽  
Mining Industry ◽  
Field Work ◽  
Geological Survey ◽  
Original Series ◽  
West Greenland ◽  
North West ◽  
One Year

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Thomassen, B., Kyed, J., Steenfelt, A., & Tukiainen, T. (1999). Upernavik 98: reconnaissance mineral exploration in North-West Greenland. Geology of Greenland Survey Bulletin, 183, 39-45. https://doi.org/10.34194/ggub.v183.5203 _______________ The Upernavik 98 project is a one-year project aimed at the acquisition of information on mineral occurrences and potential in North-West Greenland between Upernavik and Kap Seddon, i.e. from 72°30′ to 75°30′N (Fig. 1A). A similar project, Karrat 97, was carried out in 1997 in the Uummannaq region 70°30′–72°30′N (Steenfelt et al. 1998a). Both are joint projects between the Geological Survey of Denmark and Greenland (GEUS) and the Bureau of Minerals and Petroleum (BMP), Government of Greenland, and wholly funded by the latter. The main purpose of the projects is to attract the interest of the mining industry. The field work comprised systematic drainage sampling, reconnaissance mineral exploration and spectroradiometric measurements of rock surfaces.

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