Abstract
SUMMARY Local recordings on the 1974 LISPB array of a shock from an earthquake series in NW Scotland show a well developed Sg-wavegroup and higher mode coda. Using the results of previous work on the group velocity dispersion of the higher mode surface waves, a synthetic seismogram study is carried out to obtain a revised estimate of the depth of the event and investigate the nature of the rupture process. High-frequency (up to 5Hz) synthetic seismograms are constructed using a modal summation technique. These indicate that a fault model consisting of a single rupture is inconsistent and that a more appropriate description consists of two components. The main component corresponds to an event at a depth of 10 km and the other a weaker 'source' acting at 0.5 km. This result may be interpreted as a double event (both sources occurring on the pre-existing Strathconan fault with a lateral separation of about 2 km) or a consequence of scattering from buried heterogeneities in the upper crust.
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