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http://hdl.handle.net/2122/8039
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 | Journal: | Geochemistry Geophysics Geosystem | Series/Report no.: | 5/13 (2012) | Publisher: | American Geophysical Union | Issue Date: | 12-May-2012 | DOI: | 10.1029/2012GC004054 | Keywords: | Tunguska Lake Cheko Central Siberia Impact cratering magnetometry seismic reflection |
Subject Classification: | 04. 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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