Space geodesy constrains ice age terminal deglaciation: The global ICE‐6G_C (VM5a) model Tập 120 Số 1 - Trang 450-487 - 2015
W. R. Peltier, Donald F. Argus, R. Drummond
AbstractA new model of the last deglaciation event of the Late Quaternary ice
age is here described and denoted as ICE‐6G_C (VM5a). It differs from previously
published models in this sequence in that it has been explicitly refined by
applying all of the available Global Positioning System (GPS) measurements of
vertical motion of the crust that may be brought to bear to constrain the
thickness of ... hiện toàn bộ
Subducted slabs stagnant above, penetrating through, and trapped below the 660 km discontinuity Tập 118 Số 11 - Trang 5920-5938 - 2013
Yoshio Fukao, Masayuki Obayashi
AbstractA newPwave tomographic model of the mantle was constructed using more
than 10 million travel times. The finite‐frequency effect of seismic rays was
taken into account by calculating banana‐donut kernels at 2 Hz for all first
arrival time data, and at 0.1 Hz for broadband differential travel time data.
Based on this model, a systematic survey for subducted slab images was developed
for the ... hiện toàn bộ
Generic Atmospheric Correction Model for Interferometric Synthetic Aperture Radar Observations Tập 123 Số 10 - Trang 9202-9222 - 2018
Chen Yu, Zhenhong Li, N. T. Penna, Paola Crippa
AbstractFor mapping Earth surface movements at larger scale and smaller
amplitudes, many new synthetic aperture radar instruments (Sentinel‐1A/B,
Gaofen‐3, ALOS‐2) have been developed and launched from 2014–2017, and this
trend is set to continue with Sentinel‐1C/D, Gaofen‐3B/C, RADARSAT Constellation
planned for launch during 2018–2025. This poses more challenges for correcting
interferograms for... hiện toàn bộ
Fracture toughness anisotropy in shale Tập 121 Số 3 - Trang 1706-1729 - 2016
Michael Chandler, P. G. Meredith, Nicolas Brantut, Brian Crawford
AbstractThe use of hydraulic fracturing to recover shale gas has focused
attention on the fundamental fracture properties of gas‐bearing shales, but
there remains a paucity of available experimental data on their mechanical and
physical properties. Such shales are strongly anisotropic, so that their
fracture propagation trajectories depend on the interaction between their
anisotropic mechanical pr... hiện toàn bộ
A seismological overview of the induced earthquakes in the Duvernay play near Fox Creek, Alberta Tập 122 Số 1 - Trang 492-505 - 2017
Ryan Schultz, Ruijia Wang, Yu Jeffrey Gu, Kristine Haug, Gail M. Atkinson
AbstractThis paper summarizes the current state of understanding regarding the
induced seismicity in connection with hydraulic fracturing operations targeting
the Duvernay Formation in central Alberta, near the town of Fox Creek. We
demonstrate that earthquakes in this region cluster into distinct sequences in
time, space, and focal mechanism using (i) cross‐correlation detection methods
to deline... hiện toàn bộ
S‐velocity model and inferred Moho topography beneath the Antarctic Plate from Rayleigh waves Tập 120 Số 1 - Trang 359-383 - 2015
Meijian An, Douglas A. Wiens, Yue Zhao, Mei Feng, A. Nyblade, Masaki Kanao, Yuansheng Li, Alessia Maggi, Jean Jacques Lévêque
AbstractSince 2007/2008, seismographs were deployed in many new locations across
much of Antarctica. Using the records from 122 broadband seismic stations, over
10,000 Rayleigh wave fundamental‐mode dispersion curves have been retrieved from
earthquake waveforms and from ambient noise. Using the processed data set, a 3‐D
S‐velocity model for the Antarctic lithosphere was constructed using a
single... hiện toàn bộ
Seasonal Crustal Seismic Velocity Changes Throughout Japan Tập 122 Số 10 - Trang 7987-8002 - 2017
Qing‐Yu Wang, Florent Brenguier, Michel Campillo, Albanne Lecointre, Tetsuya Takeda, Yosuke Aoki
AbstractNoise‐based crustal seismic velocity changes are known to be affected by
environmental perturbations, such as rainfall, atmospheric pressure loading, and
temperature changes. Similar to geodetic observations, these external
perturbations can mask the effects of tectonic and volcanic processes. In this
study, we benefit from the dense Hi‐net short‐period seismic network that covers
the enti... hiện toàn bộ
Hysteresis and coercivity of hematite Tập 119 Số 4 - Trang 2582-2594 - 2014
Özden Özdemir, David J. Dunlop
AbstractIn room‐temperature hysteresis, 14 submicron hematites (0.12‐0.45 µm)
had large coercive forces Hc (150‐350 mT), while 22 natural 1‐5.5 mm hematite
crystals had Hc = 0.8‐23 mT (basal‐plane measurements). Single‐domain (SD) and
multidomain (MD) hematites owe their high Hc mainly to magnetoelastic
anisotropy, caused in fine particles by internal strains and in large crystals
by defects like ... hiện toàn bộ