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

Journal Article · Sat Jul 01 00:00:00 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), Vol. 16:7; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

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