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

Journal Article · Sat Jul 01 04:00:00 EDT 1989 · Geophysical Research Letters (American Geophysical Union); (USA)

DOI:https://doi.org/10.1029/GL016i007p00605· OSTI ID:5470983

Lay, T; Young, C J ^[1]

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1. Univ. of Michigan, Ann Arbor (USA)

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.

• OSTI ID: 5470983
• Journal Information: Geophysical Research Letters (American Geophysical Union); (USA), Journal Name: Geophysical Research Letters (American Geophysical Union); (USA) Vol. 16:7; ISSN 0094-8276; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ASIA
DATA ANALYSIS
DEVELOPED COUNTRIES
EARTH MANTLE
EARTHQUAKES
EUROPE
GEOLOGIC MODELS
GEOLOGIC STRUCTURES
GROUND MOTION
ISLANDS
KURILE ISLANDS
MOTION
SEISMIC EVENTS
SEISMIC WAVES
USSR
WAVE FORMS
WAVE PROPAGATION