Near-field deformation seen on distant broadband seismograms

Details Near-field deformation seen on distant broadband seismograms Near-field deformation seen on distant broadband seismograms

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22....1v&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 1, p. 1-4

Physics

8

Broadband, Deformation, Earthquakes, Near Fields, P Waves, S Waves, Seismograms, Bolivia, Geodesy, Nicaragua, Seismology, Subduction (Geology)

Scientific paper

Although far-field body waves and surface waves are widely recognized, the improvements in broadbands networks now allow the measurement of 'near-field' deformation of large earthquakes at great distances. Near-field motions have been recognized previously only in theory and in close-in recordings of earthquakes. We show examples from two recent events. For the large deep event on June 9, 1994 in Bolivia, there is a clear offset after the arrival of the P wave that has the amplitude expected for the near-field term. In the shallow September 2, 1992 Nicaragua earthquake, the very long-period motion observed between the P and S waves has roughly the amplitude expected from near-field terms. Such near-field terms are insensitive to earth structure, but supply information on long-period source processes, and their observation begins to close the gap between long-period seismology and geodesy.

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