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Characteristics of PmP phases from earthquakes and their role in crustal tomography:An active volcanic area example,northeastern Japan

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Science China Earth Sciences 2011年第5期54卷 640-646页

作者： XIA ShaoHong QIU XueLin XU HuiLong ZHAO MingHui SHI XiaoBin Chinese Academy of Sciences Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

Later earthquake-sourced PmP phases have the potential to significantly improve ray coverage and resolution of crustal tomography methods,as their trajectories are quite different from those of shallower P *** paper analyzes the characteristics of later PmP arrival times from earthquakes with different focal *** results show that PmP arrival time differences from earthquakes at a range of focal depths are gradually lowered with increasing *** found that where the first recorded P-wave phase was the intra-crustal refraction phase(Pg),the differences in arrival time between Pg and PmP phases decreased with increasing focal depth at an offset of less than 120 *** the first P-wave phase is the upper mantle refraction phase(Pn),the difference in arrival times between Pn and PmP phases became larger with an increase in focal depth at an offset of more than 150 km.A total of 394 PmP phases and 3356 first P phases were picked from seismograms in the active volcanic area of northeastern Japan,according to the characteristics of calculated arrival times,amplitudes and particle *** were used to investigate the role of PmP phases in crustal tomography beneath an active volcanic *** of the detailed resolution analysis show that the addition of PmP data can improve significantly the resolution of the lower crustal structure in tomographic *** the PmP data were included in the tomographic inversion,the path of upwelling magma,along which a series of low-frequency microearthquakes is clearly distributed,was better *** results suggest that the PmP phase has an important role in detailed crustal tomography.

关键词： PmP phase crustal structure tomography earthquake active volcanoes

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