Magnitude determination on LOWNET
Jacob, A.W.B.; Neilson, G.. 1977 Magnitude determination on LOWNET. Institute of Geological Sciences, 40pp. (WL/GS/77/086) (Unpublished)Before downloading, please read NORA policies.
Routine processing of seismic signals observed on LOWNET involves making measuremen"ts of (1) time and (2) amplitude and period. The time measure~ents contribute to a determination of the source position and origin time while the amplitude/period measurements allow a determination of its magnitude. The determination of source position and origin time 15 relatively straightforward relying on accuracy of onset t1ming and phase identification and a clear statement of which earth model is used. The position with magnitudes had al~ays been rather more confused and there are a number of magnitude scales in general. usc. This" reportdescrib~ s the methods of magnitude determination used on LOWNET, compares LOInmT results with those from the world network, and finally makes some attempt to link some of the S~21f!S using data from LOWNET plus some neighbouring stations. The results should be relevant to other networks set up vithin Britain. Finally some "magnitude/charge si~e" plots for quarries and underwater explosions are shown and brieflY discussed.
|Item Type:||Report (UNSPECIFIED)|
|Programmes:||BGS Programmes > Other|
|Additional Information:||This item has been internally reviewed but not externally peer-reviewed|
|Date made live:||22 Jun 2010 10:24|
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