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Data and Method of Analysis
Characteristic Features of Short Period Seismograms
6 other sections not shown
_P waves aftershocks amplitude first arrival Aniwa anomalous attenuation apparent velocities array stations attenuation zone azimuth B-4 of Appendix back-arc stations bandpass filtered seismograms coda converted phase crustal model depth descending lithosphere descending slab digital recording digital seismograms Earthquake locations Efate Island epicenters epicentral distance Erromango Examples frequency shear waves geophones Hebrides experiment Hebrides Island Hebrides network high frequency shear horizontal impulsive second arrival incident angle intermediate-depth earthquakes Isacks island arc km array km/sec locations are listed low frequency main shocks original seismograms P2 arrivals particle motion PI and P2 Port Vila predominant frequencies ray path Rayleigh waves Rayleigh-type surface waves recording station recording system refraction REMODE filtering seismic waves seismograms are shown seismograph station short period seismograms shown in Figure small amplitude southern New Hebrides structure subduction surface waves Tanna Island Tanna station Tonga upper surface vertical component seismograms wave trains