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Geophysical characterization of bottom simulating reflectors in the Fairway Basin (off New Caledonia, Southwest Pacific), based on high resolution seismic profiles and heat flow data ArchiMer
Nouze, Herve; Cosquer, Emmanuel; Collot, Julien; Foucher, Jean-paul; Klingelhoefer, Frauke; Lafoy, Yves; Geli, Louis.
High-resolution reflection and refraction seismic data were collected in 2004 to investigate, in further detail than allowed by pre-existing low resolution seismic data, the nature of a Bottom Simulating Reflector (BSR) that extends over a broad area of the Fairway Basin, a rifted, continental structure located on the eastern flank of the Lord Howe Rise, to the southwest of New Caledonia. Two main reflectors are documented: the shallower (RN) mimics the seafloor and has a negative polarity while the deeper (RP) does not always mimic the seafloor and has a positive polarity. Using the existing regional seismic lines, we can show that reflector RN can be continuously followed up to DSDP 208 drill hole site. Reflector RP is discontinuous and cannot be traced...
Tipo: Text Palavras-chave: Stratigraphy; Gas hydrates; Geophysics; Southwest Pacific; Fairway Basin; BSR.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-7321.pdf
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Prediction of the level of Paraguay river using neural networks. Repositório Alice
WEIGANG, L.; SA, L.D. de A.; GALVAO, G.P.; BEVILAQUA, R.M..
Backpropagation neural networks are implemented for prediction of the level of Paraguay River at Ladario city, MS. Using 274 monthly mean values, the trained network predicts the levels of the four next months with relative errors smaller than 17%. For some special points, the prediction results also show that the neural network method seems to be useful to predict time series related to phenomena influenced by complex climatic and geophysical processes, and it does not deal directly with causal relationship involved in the phenomena studied. A discussion about the variability of the estimation errors for different predicted data is carried out here.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Clima; Geofisica; Climate; Geophysics.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/handle/doc/95973
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Space-time evolution of a large field of pockmarks in the Bay of Concarneau (NW Brittany) ArchiMer
Baltzer, Agnes; Reynaud, Marine; Ehrhold, Axel; Fournier, Jerome; Cordier, Celine; Clouet, Helene.
About a decade ago, a large field of pockmarks, covering an overall area of 36 km(2) was discovered in water depths of < 30m in the central part of the Bay of Concarneau (Southern Brittany, France). This field, composed of features from 5 m to 35 m in diameter and < 1 m in depth, is characterized by unusual high densities of pockmarks, up to 5840 per square kilometre. Geophysical data correlated with sedimentary samples acquired in 2005 and 2009 show that pockmarks and their immediate surroundings are associated with dense tubes benches cover, built by a filter-feeding amphipod: Haploops nirae, forming original benthic communities. Two complementary surveys were carried out in April 2011 (Pock and Ploops) and April 2014 (Pock and Tide), on the...
Tipo: Text Palavras-chave: Géophysique; Marée; Failles; Gaz; Geophysics; Pockmarks; Tide; Turbidity; Gas; Chimneys pipes; Concarneau.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00410/52107/52938.pdf
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