Determination of Earthquake Source Parameters from Waveform Data for Studies of Global and Regional Seismicity

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The proposed continuation of global and regional studies of earthquake source mechanism using waveforem inversion will cover the following topics: 1. Continuation of the centroid-moment tensor (CMT) analysis of current events using GDSN, and other - as available - data, with the results sent to the USGS on a monthly basis and submitted quarterly for publication in the Physics of the Earth and Planetary Interiors. 2. Utilization of the data from the High-Gain Long-Period (HGLP) network operating between 1972 and 1976; this was the first global digital network and little use has been made of it; will determine station responses and sensitivities; permanent storage on the optical media (WORM type discs); 3. CMT and very broad bank (VBB) analysis of the HGLP data for selected events between 1972 and 1976; this period is characterized by many large earthquakes lacking, so far, proper analysis; 4. Systematic search for events with a statistically significant non-double couple component; it is highly likely that there are events which have an unusual source mechanism: two events near Torishima Island, south of Japan and three events on Iceland have mechanism that appear to be consistent with being caused by magma injection. ***