Werner, S. C., Plado, J., Pesonen, L. J., Janle, P. and Elo, S. (2002) Potential fields and subsurface models of Suvasvesi North impact structure, Finland. Physics and Chemistry of the Earth, 27 (25-31). pp. 1237-1245. DOI 10.1016/s1474-7065(02)00117-1.

Abstract

The Suvasvesi North (N) impact structure, central-east Finland, has a diameter of about 3.5 km. It is covered by Lake Suvasvesi and lacks a topographic or bathymetric rim. The structure has a pronounced geophysical response, i.e. gravity, magnetics and electromagnetics. It is characterised by a similar to3.5 km wide negative Bouguer gravity anomaly of 5.5 mGal. The impact-related anomaly is about 2.8 mGal whereas regional geological features, water, and post-impact Quaternary sediments produce the difference. The physico-chemical processes due to the impact event have reduced and smoothed the airborne magnetic anomalies at the crater area. A small and intensive circular negative anomaly of similar to160 nT in amplitude and similar to0.8 km in diameter has been drilled and proven to be caused by impact melt. This central magnetic anomaly nearly coincides with the distinct bathymetric depth maximum (ca. 90 m). The Suvasvesi lake and Suvasvesi N structure are characterised also by electromagnetic anomalies. This article presents the potential fields, subsurface models, and an age estimate of the Suvasvesi N impact structure. (C) 2002 Elsevier Science Ltd. All rights reserved.

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