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| Bertrand, E; Deschamps, A; Virieux, J. |
| An investigation of the teleseismic P -wave coda is performed using the single-scattering approximation. The method allows one to image short-wavelength scale (less than or equal to2 km) velocity and density heterogeneities and structures that are barely detected by traveltime tomography. Source effects are removed by using receiver functions for data interpretation, but the amplitude (especially the sign of the signal) is synthesized. Both broad-band seismological stations in the southwestern Alps (France) and Campanian plain (Italy) are used for the illustration of the proposed method. Because of the large aperture of our arrays, laterally small-scale heterogeneities are difficult to image and we must assume lateral continuity of the detectable... |
| Tipo: Text |
Palavras-chave: Body waves; Broad-band; Crustal structure; Moho discontinuity; P-to-S conversions; Scattering; Waveform analysis. |
| Ano: 2002 |
URL: https://archimer.ifremer.fr/doc/00466/57762/60036.pdf |
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| Valdy, Pierre; Ciausu, Viorel; Moriconi, Pascal; Rigaud, Vincent; Hello, Y; Charvis, P; Deschamps, A; Sillans, C. |
| Deep Sea Net is a new concept of deep sea sensor network built from fiber optic micro cable and battery operated IP access nodes. Deep Sea Net fiber optic transport segments are deployed directly from a standard ROV, avoiding the use of a costly cable layer ship. Deployment skid is abandoned on user site ready to connect local sensors and next transport segment. Deep Sea Net is a low consumption network which can be waked on user (or sensor) demand. Lithium batteries and fine power management will give 10 years of autonomy with ¼ of hour operation per day. The innovative approach of Deep Sea Net will permit to build, extend and maintain future sensor networks at very competitive prices. |
| Tipo: Text |
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| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/00122/23342/21167.pdf |
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