Modelling of depth phases and source processes of some central Aleutian earthquakes |
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| Authors: | Tai-Lin Hong Kazuya Fujita |
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| Institution: | Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125U.S.A.;Department of Geology, Michigan State University, East Lansing, MI 48824U.S.A. |
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| Abstract: | Short-period synthetic seismograms are computed to determine the relative amplitudes and arrival times of P, pP, pwP (water surface reflection), and sP phases. Except along nodal planes of upgoing p, pwP is of greater amplitude than sP. For central Aleutian earthquakes, pwP dominates over sP and pP at North American stations for thrust mechanisms and modelled crustal structures. The pwP phase is clearly identified in three Aleutian events and can be used to constrain focal depths. Complex fracturing processes are identified in two of the events. In simple events, smaller phases which are consistent from station to station can be identified as sub-surface reflections and used for modelling the structure of the forearc. |
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