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Authors: Gasperini, L.* 
Cocchi, L.* 
Stanghellini, C.* 
Stanghellini, G.* 
Del Bianco, F.* 
Serrazanetti, M.* 
Carmisciano, C.* 
Title: Magnetic and seismic reflection study of Lake Cheko, a possible impact crater for the 1908 Tunguska Event
Issue Date: 12-May-2012
Series/Report no.: 5/13 (2012)
DOI: 10.1029/2012GC004054
Keywords: Tunguska
Lake Cheko
Central Siberia
Impact cratering
seismic reflection
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.06. Seismic methods 
04. Solid Earth::04.04. Geology::04.04.04. Marine geology 
04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies 
Abstract: A major explosion occurred on 30 June 1908 in the Tunguska region of Siberia, causing the destruction of over 2,000 square km 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 (~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.
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