We investigate the fine structure of the D'' layer beneath the southwestern
Pacific using short-period data from 7 deep events in the Fiji-Tonga
region recorded at the J-Array in Japan. We use a double array migration
method which integrates source array beamforming with receiver array
beamforming. The phase-weighted stacking technique, which reduces
incoherent noise by employing complex trace analysis, is also applied.
This combination greatly enhances small phases common to the source
and receiver beams. We present coherent phases originating from the
lowermost mantle using these new array techniques. The results indicate
that seismic energy is reflected at two negative discontinuities
near 2550 and 2650 km. The migration shows only weak evidence for
scattering objects which may be an indication that scattering in
the D'' layer beneath the southwestern Pacific is weak.
%0 Journal Article
%1 kito_kruger:2001
%A Kito, Tadashi
%A Krüger, Frank
%D 2001
%J Geophysical Research Letters
%K geophysics seismology
%N 13
%P 2545--2548
%R 10.1029/2000GL012801
%T Heterogeneities in D'' beneath the southwestern Pacific inferred
from scattered and reflected P-waves
%U http://dx.doi.org/10.1029/2000GL012801
%V 28
%X We investigate the fine structure of the D'' layer beneath the southwestern
Pacific using short-period data from 7 deep events in the Fiji-Tonga
region recorded at the J-Array in Japan. We use a double array migration
method which integrates source array beamforming with receiver array
beamforming. The phase-weighted stacking technique, which reduces
incoherent noise by employing complex trace analysis, is also applied.
This combination greatly enhances small phases common to the source
and receiver beams. We present coherent phases originating from the
lowermost mantle using these new array techniques. The results indicate
that seismic energy is reflected at two negative discontinuities
near 2550 and 2650 km. The migration shows only weak evidence for
scattering objects which may be an indication that scattering in
the D'' layer beneath the southwestern Pacific is weak.
@article{kito_kruger:2001,
abstract = {We investigate the fine structure of the D'' layer beneath the southwestern
Pacific using short-period data from 7 deep events in the Fiji-Tonga
region recorded at the J-Array in Japan. We use a double array migration
method which integrates source array beamforming with receiver array
beamforming. The phase-weighted stacking technique, which reduces
incoherent noise by employing complex trace analysis, is also applied.
This combination greatly enhances small phases common to the source
and receiver beams. We present coherent phases originating from the
lowermost mantle using these new array techniques. The results indicate
that seismic energy is reflected at two negative discontinuities
near 2550 and 2650 km. The migration shows only weak evidence for
scattering objects which may be an indication that scattering in
the D'' layer beneath the southwestern Pacific is weak.},
added-at = {2012-09-01T13:08:21.000+0200},
author = {Kito, Tadashi and Kr\"{u}ger, Frank},
biburl = {https://www.bibsonomy.org/bibtex/24c1e19cb3ea2101ec0a160029c157fd6/nilsma},
doi = {10.1029/2000GL012801},
interhash = {a7aecd535f63776f1d458c0d37e62798},
intrahash = {4c1e19cb3ea2101ec0a160029c157fd6},
issn = {0094-8276},
journal = {Geophysical Research Letters},
keywords = {geophysics seismology},
month = jul,
number = 13,
pages = {2545--2548},
timestamp = {2021-02-09T13:27:42.000+0100},
title = {Heterogeneities in D'' beneath the southwestern Pacific inferred
from scattered and reflected P-waves},
url = {http://dx.doi.org/10.1029/2000GL012801},
volume = 28,
year = 2001
}