National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Analysis of the P-wave directivity for selected earthquakes in the West Bohemia region
Lávička, Vojtěch ; Vavryčuk, Václav (advisor) ; Gallovič, František (referee)
I have employed three simple models of the finite earthquake source: the linear unilateral model, the linear symmetrical bilateral model and the circular fault model. I computed the apparent rupture time and constructed the curve of directional dependence of the apparent rupture time. I examined this directional dependence as a function of the rupture model parameters. I calculated and plotted graphs of apparent rupture time on the focal sphere. Then I analyzed 12 events from the 2008 West Bohemia earthquake swarm. I studied direct P waves which had been recorded at stations of the WEBNET seismic network (0,5/1/0,033 Hz - 80/60 Hz). I have measured durations of the first pulse of (i) original velocity records, and (ii) displacement curves computed numerically from the velocity records. I plotted the data on the focal sphere in the zenithal equal-area projection. I visually compared these focal sphere maps of the measured pulse duration with the focal sphere maps of the theoretically computed apparent rupture time. I attempted to assign a satisfactory source model to each map. In most cases, the unilateral fault model rupturing upwards along the B axis, or the bilateral fault model rupturing parallel to the rake direction fitted the data best.

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2 LAVIČKA, Václav
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