Tunguska99 Update - October 12, 1999

[Ron Baalke <BAALKE@kelvin.jpl.nasa.gov>]

                               Tunguska99  
                              Press Release
             http://www-th.bo.infn.it/tunguska/press1210_en.htm
                            October 12, 1999

                       Poster presentation at DPS/AAS

The first scientific results of the italian scientific expedition Tunguska99
will be presented at the 31st Annual Meeting of the Division for Planetary
Sciences of the American Astronomical Society (Padova, Italy, October 10-15
1999). The poster will be presented in the Session 59 (late papers) on
Thursday 14 october (6:00-7:30 PM). Moreover, the abstract will be published
on the Bulletin of the American Astronomical Society, vol. 31, n. 5, (1999)
and is available on the web at the Tunguska99 home page.

Processing of the data is in progress, but preliminary analysis of data
collected on the lake suggests that the origin of the lake be not related to
the 1908 event. It constitutes, more likely, an ancient volcanic depression
filled up by a more than 50 m thick sedimentary deposit of fluviatile
origin. The future work will focus on the core analysis, and on the
detection of possible physical effects within the sedimentary successions
(i.e. gravitative failures of the slopes) that could give important insights
on the energy of the event.

An aerial photographic survey covering a surface of 235 kmē has been carried
out. Contemporarily we measured on the ground the geographical coordinates
of some points in the same area. The results of the aerial survey and
topographic measurements are being processed to check whether the 1908
explosion was single or multiple and to verify a recent hypothesis on the
explosion mechanism.

Gamma rays from cosmic and environmental radiation have been continuously
recorded on time scale of one minute and in the 0.05-3 MeV, 3-5 MeV and 5-20
MeV energy bands. The in-flight measurements indicate great gamma ray
variations in dependence on altitude, longitude and latitude. Nearby the
lake Cheko daughter radionuclides from the 238U and 232Th chains have been
recorded. The data are being processed to find other natural or man-made
radionuclides.

Bologna, 12 October 1999

For the Tunguska99 Press Office:
Luigi Foschini

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