Physics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...72...83y&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 72, Issue 1-2, p. 83-98.
Physics
Scientific paper
Post-seismic behavior induced by a deep-focus earthquake in subduction zone is closely investigated numerically on realistic upper-mantle models, taking into account the pressure and temperature conditions. For this purpose, the post-seismic stress changes expected from the deep event are calculated by a two-dimensional finite element method (2D FEM), assuming newtonian and power-law creep behaviors as justified by high P-T experiments. Several cases are investigated in detail for various fault depths and thermal structures. Two cases are considered for the location of the fault: one when an earthquake occurs within oceanic crust overlying a subducting plate, and the other when an earthquake is located within the plate. We also examine the case when the temperature distribution within the plate is lower by about 200°C on average than that in the upper mantle at the same depth. In addition, the post-seismic behavior due to a deep-focus event in a petrological thermal model of a mantle wedge is investigated.
The results show that the post-seismic behavior associated with the deep event occurring within the oceanic crust indicates a pattern of relaxation of the coseismic stress changes. Lower temperatures inside the plate would suppress the post-seismic displacements and stress changes effectively. The petrological model also has some influence on the post-seismic flow pattern in the mantle wedge. We also study a possible correlation between deep-focus earthquakes and a shallow large event which has been detected in the northwestern Pacific region. However, effective mechanisms to explain the phenomenon could not be identified from the viewpoint of post-seismic behavior caused by power-law creep.
Hirahara Kazuro
Loo Huan Yen
Mikumo Takeshi
Yoshioka Shoichi
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