Research Directed Toward the Use of Long and Intermediate Period Seismic Waves for the Identification of Seismic Sources.
Semi-annual technical rept. no. 7, Jul-Dec 74,
LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES N Y
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Continuing research on the anomalous event problem has placed these events in a particular tectonic setting. The location of the anomalous events is associated with the termination of the tectonic trends of the Himalayas, and the intersection of these trends with the northern extension of the Ancaman-Burman arc. Thus, the tectonic regime of the anomalous events is not part of the Himalayas, but rather appear to be related to end-effects at the eastern terminus of the Himalayas. Further, the thick crust of the Tibetan Plateau, almost twice that of normal continental crust, probably plays a significant role in the occurrence of seismic events with anomalously low surface-wave amplitudes. The thick crust not only offers a medium for the occurrence of earthquakes of moderate focal depth, but also provides a waveguide for the efficient propagation of Love waves and higher-mode Rayleigh waves.