PUMA
Istituto di Scienze Marine     
Gasperini L., Cocchi L., Stanghellini C., Stanghellini G., Del Bianco F., Serrazanetti M., Carmisciano C. Magnetic and seismic reflection study of Lake Cheko, a possible impact crater for the 1908 Tunguska Event. In: Geochemistry Geophysics Geosystems, vol. 13 (5) article n. Q05008. AMER GEOPHYSICAL UNION, 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA, 2012.
 
 
Abstract
(English)
A major explosion occurred on 30 June 1908 in the Tunguska region of Siberia, causing the destruction of over 2,000 km(2) of taiga; pressure and seismic waves detected as far as 1,000 km away; bright luminescence in the night skies of Northern Europe and Central Asia; and other unusual phenomena. This "Tunguska Event" is probably related to the impact with the Earth of a cosmic body that exploded about 5-10 km above ground, releasing in the atmosphere 10-15 Mton of energy. Fragments of the impacting body have never been found, and its nature (comet or asteroid) is still a matter of debate. We report here results from a magnetic and seismic reflection study of a small (similar to 500 m diameter) lake, Lake Cheko, located about 8 km NW of the inferred explosion epicenter, that was proposed to be an impact crater left by a fragment of the Tunguska Cosmic Body. Seismic reflection and magnetic data revealed a P wave velocity/magnetic anomaly close to the lake center, about 10 m below the lake floor; this anomaly is compatible with the presence of a buried stony object and supports the impact crater origin for Lake Cheko.
DOI: 10.1029/2012GC004054
Subject impact cratering


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