Collaborative Research: Determination of Earthquake Source Parameters from Waveform Date for Studies of Global and Regional Seismicity

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In this proposal for joint research with Harvard University we request funding for the continuation of global and regional studies of earthquake source mechanisms using waveform inversion. The research will cover the following topics. 1. Continuation of the centroid-moment-tensor (CMT) analysis of current events. 2. Utilization of the data from the High-Gain Long-Period (HGLP) network which operated between 1972 and 1976. 3. CMT and very broad band 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 earthquakes with a statistically significant non-double couple component. Two events near Torishima Island, Japan, and three events on Iceland have mechanisms that appear to be consistent with magma injection. 5. Global synthesis. Compilation of a catalog CMT solution in a volume which would include discussion of the seismicity on a region by region basis. 6. Quasi-real time source studies. The objective is to produce reliable source mechanisms one to two hours after the occurrence of the event. 7. Analysis of spatio-temporal distribution of earthquakes and its relation to tectonic processes.