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Title: Waveform complexity in teleseismic broadband SH displacements: Slab diffractions or deep mantle reflections

Abstract

Transverse component bodywave ground displacements from deep focus earthquakes complexities which are not accounted for by standard radially symmetric Earth models. This anomalous behavior is examined using 123 broadband teleseismic SH displacement recordings, reconstituted from short-and long-period or broadband seismograms for 11 events in the Kurile subduction zone. The greatest complexity, involving an extra arrival between the S and ScS phases at epicentral distances greater than 72, has a strong distance dependence and little azimuthal variation with respect to the source region, favoring an interpretation as a deep mantle triplication rather than a near-source slab diffraction.

Authors:
;  [1]
  1. Univ. of Michigan, Ann Arbor (USA)
Publication Date:
OSTI Identifier:
5470983
Resource Type:
Journal Article
Journal Name:
Geophysical Research Letters (American Geophysical Union); (USA)
Additional Journal Information:
Journal Volume: 16:7; Journal ID: ISSN 0094-8276
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; KURILE ISLANDS; EARTHQUAKES; SEISMIC WAVES; DATA ANALYSIS; EARTH MANTLE; GEOLOGIC MODELS; GEOLOGIC STRUCTURES; GROUND MOTION; WAVE FORMS; WAVE PROPAGATION; ASIA; DEVELOPED COUNTRIES; EUROPE; ISLANDS; MOTION; SEISMIC EVENTS; USSR; 580000* - Geosciences

Citation Formats

Lay, T, and Young, C J. Waveform complexity in teleseismic broadband SH displacements: Slab diffractions or deep mantle reflections. United States: N. p., 1989. Web. doi:10.1029/GL016i007p00605.
Lay, T, & Young, C J. Waveform complexity in teleseismic broadband SH displacements: Slab diffractions or deep mantle reflections. United States. https://doi.org/10.1029/GL016i007p00605
Lay, T, and Young, C J. Sat . "Waveform complexity in teleseismic broadband SH displacements: Slab diffractions or deep mantle reflections". United States. https://doi.org/10.1029/GL016i007p00605.
@article{osti_5470983,
title = {Waveform complexity in teleseismic broadband SH displacements: Slab diffractions or deep mantle reflections},
author = {Lay, T and Young, C J},
abstractNote = {Transverse component bodywave ground displacements from deep focus earthquakes complexities which are not accounted for by standard radially symmetric Earth models. This anomalous behavior is examined using 123 broadband teleseismic SH displacement recordings, reconstituted from short-and long-period or broadband seismograms for 11 events in the Kurile subduction zone. The greatest complexity, involving an extra arrival between the S and ScS phases at epicentral distances greater than 72, has a strong distance dependence and little azimuthal variation with respect to the source region, favoring an interpretation as a deep mantle triplication rather than a near-source slab diffraction.},
doi = {10.1029/GL016i007p00605},
url = {https://www.osti.gov/biblio/5470983}, journal = {Geophysical Research Letters (American Geophysical Union); (USA)},
issn = {0094-8276},
number = ,
volume = 16:7,
place = {United States},
year = {1989},
month = {7}
}