Physics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.2201v&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Dec. 1991, p. 2201-2204. Research supported by NASA, NSF, and W.M. Keck
Physics
19
Earth Mantle, Metastable State, Olivine, Seismic Waves, Seismology, Subduction (Geology), Earthquakes, Finite Difference Theory, Mathematical Models, P Waves, Spinel, Waveforms
Scientific paper
Velocity models of subducting slabs with a kinetically-depressed olivine to beta- and gamma-spinel transition are constructed, and the effect that such structures would have on teleseismic P waveforms are examined using a full-wave finite-difference method. These 2D calculations yielded waveforms at a range of distances in the downdip direction. The slab models included a wedge-shaped, low-velocity metastable olivine tongue (MOTO) to a depth of 670 km, as well as a plausible thermal anomaly; one model further included a 10-km-thick fast layer on the surface of the slab. The principal effect of MOTO is to produce grazing reflections at wide angles off the phase boundary, generating a secondary arrival 0 to 4 seconds after the initial arrival depending on the take-off angle. The amplitude and timing of this feature vary with the lateral location of the seismic source within the slab cross-section.
Houston Heidi
Vidale John E.
Williams Quentin
No associations
LandOfFree
Waveform effects of a metastable olivine tongue in subducting slabs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Waveform effects of a metastable olivine tongue in subducting slabs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Waveform effects of a metastable olivine tongue in subducting slabs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1538501