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Suspected Earth Impact Sites

Introduction: Growing number of identified impact structures led to a need for maintaining reliable database with basic parameters for each structure and Earth Impact Database [1] eventually established itself as the most commonly cited reference work. Similar reliable database for even greater number of proposed but not confirmed structures has not been available until recently. Basic information on these structures has been scattered among individual papers and a number of published or privately held partial databases. The most extensive public database has been maintained on-line by Jarmo Moilanen [2]. It provides references and valuable additional information for some of the structures, but for most of the structures, references are not available, which prevents an assessment of the quality and vintage of the data. For example, several structures repeat under different names, all latitude and longitude coordinates were listed with a precision to the nearest minute although many coordinates were clearly converted from data with an order of magnitude lower precision. A number of researchers felt that a new rigorous database was needed. Suspected Earth Impact Sites (SEIS): The development of this database started in October 2004 for a brief reconnaissance project at Shell and was released for public development in June 2005. It started off combining information from four databases by Whitehead [1 – Earth Impact Database], Sharpton [3 – GISP], Fortes [4] and Moilanen [2] plus information that I compiled from literature. The Earth Impact Database and GISP were considered authorities for identification of confirmed impact structures. Fortes' database provided some useful references. Moilanen's extensive list of proposed impact structures together with those that I independently compiled from literature formed the basis of the new database. SEIS is thus complementary to the Earth Impact Database. The aim for this database is to:-Provide ever-evolving list helping to steer research on suspected impact structures.-Provide basic data for each structure presented with a meaningful precision.-Provide brief and specific information about data sources and quality, incl. literature references, methods used to measure the data, clarification of conflicting information from various literature sources etc.