Detection of Depth Phases Using Computer Graphics
TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA ANALYSIS CENTER
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From a dataset of 116 earthquakes, all available SRO Special Research Observatory and PSWF Preliminary Signal Waveform File waveforms were presented on an interactive computer graphics screen and then examined for presence of depth phases pP, sP and PcP. Using the results, a focal depth for 66 of the total was postulated. About half of these, or 37, agreed with depths published by NEP Network Event Processor or PDE Preliminary Determination of Epicenter bulletins. Earthquakes of magnitude m sub b 5 are likely to produce clear depth phases. Rapid routine processing of a large number of events by the aligned-on-P method can be achieved with interactive computer graphics.
- Computer Systems
- Seismic Detection and Detectors