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
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