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boat-towed methods

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Journal Article
Journal: Geophysics
Published: 15 October 2015
Geophysics (2015) 80 (6): B193–B10.
... of the world, the method can be used for near-surface studies of various targets. We have developed boat-towed RMT measurements on Lake Mälaren near the city of Stockholm in Sweden to determine the feasibility of the method. Approximately 15 km of RMT data were collected during three days above a planned 60-m...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1982
AAPG Bulletin (1982) 66 (5): 602–603.
...W. Harry Mayne True offshore seismic exploration had its inception in 1947. Although considerable work had been done prior to this in coastal estuaries, wetlands, and inland waterways, the methods used were adapted almost entirely from the conventional land operations. The first tentative ventures...
Journal Article
Published: 01 June 2017
Journal of Environmental and Engineering Geophysics (2017) 22 (2): 191–196.
.... The survey was conducted to determine if the method could be used to define subbottom sediments and other geological features to answer questions related to recent-past volcanic and tectonic events. The survey used a 15-meter dipole-dipole array towed at approximately 2 mph behind a small flat bottomed boat...
FIGURES
Journal Article
Published: 01 September 2015
Journal of Environmental and Engineering Geophysics (2015) 20 (3): 245–255.
... towed by another boat powered by an electrical trolling motor. A total of eighteen crossings were performed along the entire length of the lake and a new integrated method using multiple processing software was applied to generate three-dimensional and contoured surfaces of bathymetry, sediment...
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Journal Article
Journal: Geophysics
Published: 01 March 1997
Geophysics (1997) 62 (2): 533–539.
...Martin Landrø; Jan Langhammer; James Martin Abstract A method for damping unwanted bubble oscillations from a horizontally towed seismic air gun is presented. The air bubble is destroyed by a perforated screen mounted at an optimal radius about the gun. Once the primary pressure peak has been...
Journal Article
Journal: AAPG Bulletin
Published: 01 December 1948
AAPG Bulletin (1948) 32 (12): 2315–2316.
... in a diving bell; later, the present remote-controlled gravity meter was evolved. Magnetic surveying, using both airborne and boat-towed instruments, is also employed. Early seismograph work, with charges and seismometers on the Gulf floor, was slow and costly. Experience has greatly refined seismic methods...
Journal Article
Published: 01 June 2005
Journal of Environmental and Engineering Geophysics (2005) 10 (2): 87–98.
... of the dispersion curves. Limitations include an observed narrower bandwidth of marine surface wave energy and noise resulting from towing the streamer with a boat. In this paper, MASW data acquired with a hydrophone streamer in a shallow marine environment are evaluated. Measurements were made on land adjacent...
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Series: Society of Exploration Geophysicists Geophysics Reprint Series
Published: 01 January 2016
EISBN: 9781560803386
... bandwidth and fidelity. In certain circumstances a fixed-receiver system, rather than towed cables, is the preferred form of marine seismic acquisition. The reason can be strong currents, heavy ship traffic, or dense surface obstructions (e.g., drilling platforms). Fixed-receiver methods...
Series: Geological Society, London, Memoirs
Published: 01 January 2016
EISBN: 9781862397088
... of the tow-fish, to calculate water depth. This method yields an extremely high data density, but often suffers from being very sensitive to noise and the potential for the miss-picking of phase cycles; the bathymetry data derived from MBES is still usually superior in all aspects, except for the fact...
Series: Society of Exploration Geophysicists Geophysical References Series
Published: 01 January 2004
DOI: 10.1190/1.9781560801733.ch12
EISBN: 9781560801733
... ocean-bottom cables (OBC), each having 48 geophone/hydrophone groups spaced at 50-m intervals, the receiver lines being 400 m apart. A source boat towing an air-gun source traversed 19 lines spaced 250 m apart perpendicular to the receiver lines, each of the source lines being 2000 m long with air-gun...
Series: Investigations in Geophysics
Published: 01 January 1991
DOI: 10.1190/1.9781560802686.ch12
EISBN: 9781560802686
... (A). The lower panel (B-1) shows the transmitted waveform, obtained by switching the source half cycles. The phase of the switching is chosen to maximize the power at the fundamental and third harmonic (B-2). Fig. 27. The received signal in instrument counts for the towed frequency-domain system at 7...
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Journal Article
Journal: Geophysics
Published: 08 February 2012
Geophysics (2012) 77 (1): S19–S30.
...-velocity zones. Using finite-element methods, we reproduced static errors and wavelet distortions by incorporating the effects of bubble plumes into the finite-element model. The results of finite-element modeling confirmed our hypothesis that bubble-plume static errors and bubble-plume wavelet distortions...
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Journal Article
Journal: Geophysics
Published: 30 September 2010
Geophysics (2010) 75 (4): WA135–WA147.
... methods are based on established ground and airborne electrical and electromagnetic technologies, including towed transient electromagnetic systems, towed direct current resistivity array systems, and frequency-domain helicopter electromagnetic systems. Although these systems are individually successful...
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Journal Article
Journal: Geophysics
Published: 31 October 2006
Geophysics (2006) 71 (6): V171–V186.
... in the synthetic examples, we increased the azimuth multiplicity by sailing as if the boat towed fewer streamers than it actually did, yielding an overlap in midpoints. In the first example, we have eight streamers with 75% overlap in the swaths yielding an azimuth multiplicity of two. In the second example, we...
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Journal Article
Journal: Geophysics
Published: 01 July 2008
Geophysics (2008) 73 (4): G39–G49.
... inflated to about 0.5-m diameter. Before the readings were taken on each profile measurement, the streamer was towed a sufficient distance to be as straight as possible ( Figure 3b ). To achieve a good compromise between data quality and quantity, we maintained the boat at a speed of 2 km per...
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Journal Article
Journal: Geophysics
Published: 01 January 2000
Geophysics (2000) 65 (3): 994–1002.
...John A. Dunbar; Peter M. Allen; Paul D. Higley Abstract In this paper we describe color encoding methods for combining acoustic data in widely separate spectral bands into composite displays. These new display methods better image the near-bottom interval in fine-grained depositional environments...
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Journal Article
Journal: Geophysics
Published: 07 August 2015
Geophysics (2015) 80 (6): WD37–WD44.
... at aggressive simultaneous source acquisitions a decade ago focused on marine towed-streamer acquisition, BP’s first efforts in this area concentrated on simultaneous source acquisition on land. One of the first successful methods of blended source acquisition used at BP was that of distance-separated...
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Journal Article
Journal: Geophysics
Published: 01 January 2000
Geophysics (2000) 65 (5): 1364–1371.
... migration (LSMig) are a family of developing processing methods which are based on inversion of reverse DMO and demigration operators. LSDMO and LSMig find the earth model that best fits the data and a priori assumptions which can be imposed as constraints. Such inversions are more computer intensive...
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Journal Article
Journal: Geophysics
Published: 21 August 2017
Geophysics (2017) 82 (6): B189–B199.
... below the water surface, the towed cable was equipped with plastic floaters and kept stretched by the friction with water of these elements and an additional small raft fixed at the end of the cable (Figure  4b ). The adopted array had two current electrodes, in the cable part closest to the boat...
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Journal Article
Journal: Geophysics
Published: 03 March 2016
Geophysics (2016) 81 (2): V125–V139.
.... (a) Top and (b) lateral schematic views of the V-shaped MLS array. The black filled circles represent individual sources, whereas the bigger circles represent clusters of sources. A black arrow indicates the towing direction (i.e., toward the boat). Figure 5. Workflow of the application...
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