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V. Bronshten, On the nature of the Tunguska meteorite
M. Pipan, L. Baraldello, E. Forte, L. Gasperini, E. Bonatti, G. Longo, Ground penetrating radar study of the Cheko lake area (Siberia).
M. Di Martino, G. Longo, An Italian Scientific Expedition in Tunguska
G. Longo, S. Cecchini, M. Cocchi, M. Di Martino, M. Galli, G. Giovannini, A. Pagliarin, L. Pavlova, R. Serra, Environmental radiation measured in Tunguska (Siberia) and during the flights from Forlм-Krasnoyarsk-Forlм
L. Amaroli, etc, A multidisciplinary investigation in the site of the Tunguska explosion
Korotkov, P. F.; Kozin, V. N., The Tunguska Meteorite Explosion and Flattened Forest Origin
Каталог
M. Pipan, L. Baraldello, E. Forte, L. Gasperini, E. Bonatti, G. Longo, Ground penetrating radar study of the Cheko lake area (Siberia). 8th International Conference on Ground Penetrating Radar, In David A. Noon, Glen F. Stickley, Dennis Longstaff Eds, SPIE PRESS, vol. 4084, pp. 329-334, 2000
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Тунгусский феномен » Исследования » Библиография » 2000-09 » 2000 » M. Pipan, L. Baraldello, E. Forte, L. Gasperini, E. Bonatti, G. Longo, Ground penetrating radar study of the Cheko lake area (Siberia).

SUMMARY

We performed an integrated acoustic and GPR study of the Cheko Lake area (101o E, 62o N) during summer 1999. The GPR study aimed at imaging lake bottom and shallow sedimentary layers to plan coring of sediments coeval with the catastrophic 1908 explosion. The water of the Cheko Lake strongly attenuates radar waves. Therefore, the central and northern sectors of the lake (30 m average depth) were surveyed by means of acoustic techniques only. Integrated acoustic and GPR techniques were used in the shallow southern sector. More than 5 km of radar profiles were obtained in the lake, using 50 MHz and 100 MHz antennas. 150 metres of 200 MHz multi-fold profiles were obtained across the only accessible sectors on land. The GPR profiles processed to date successfully image discontinuities at depths greater than 700 cm. Comparison with acoustic results shows that GPR provides high resolution images of the depth range of interest (0-500 cm) which complement the information obtained from subbottom profilers and can be calibrated by the gravity cores. A deep (700 cm) flat sub-horizontal reflector, shallow (0- 200 cm) dipping layers, sigmoidal structures and local chaotic lenses are the primary features imaged by GPR in the lake.

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