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Space is used to split words, "" can be used to search for a whole string (not indexed search then)
AND, OR and NOT are prefix words, overruling the default operator
+/|/- equals AND, OR and NOT as operators.
All search words are converted to lowercase.
seismic station Weimar
dayplot - archive of the seismic station "Parkhöhle Weimar"
Internet earthquake informations made available by several institutions are used for the markers: