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Magnitude determination on LOWNET

By A.W.B. Jacob and G. Neilson

Abstract

Routine processing of seismic signals observed on LOWNET involves\ud making measuremen"ts of (1) time and (2) amplitude and period. The time\ud measure~ents contribute to a determination of the source position and\ud origin time while the amplitude/period measurements allow a determination\ud of its magnitude. The determination of source position and origin time\ud 15 relatively straightforward relying on accuracy of onset t1ming and\ud phase identification and a clear statement of which earth model is used.\ud The position with magnitudes had al~ays been rather more confused\ud and there are a number of magnitude scales in general. usc. This" reportdescrib~\ud s the methods of magnitude determination used on LOWNET, compares\ud LOInmT results with those from the world network, and finally makes some\ud attempt to link some of the S~21f!S using data from LOWNET plus some\ud neighbouring stations. The results should be relevant to other networks\ud set up vithin Britain. Finally some "magnitude/charge si~e"\ud plots for quarries and underwater explosions are shown and brieflY discussed

Publisher: Institute of Geological Sciences
Year: 1977
OAI identifier: oai:nora.nerc.ac.uk:10037

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