Results 101 to 110 of about 31,006 (289)

A Review of Seismic Anisotropy

, 2016
Lithosphere is usually modeled as a layered isotropic medium. However, in reality, upper mantle is anisotropic as evidenced by the azimuthal dependence of P and S wave propagation speed. Probable causes of the observed seismic wave propagation anisotropy include the aligned crystal structure of minerals, aligned cracks and fractures. This anisotropy in
openaire   +1 more source

Crustal Seismic Anisotropy in Shandong

DEStech Transactions on Materials Science and Engineering, 2017
Based on the seismic data of near-field source from Shandong Seismic Network, the study obtained the shear-wave splitting parameters from multiple stations. The results show that dominant directions of polarizations of fast shear-waves reflect the spatial distribution characteristics of tectonic stress in this area, CHD and LIS stations show 2 dominant
Qing-Jie MIAO, Xi-Qiang LIU, Jun-Hao QU, Jian-Chang ZHENG   +3 more
openaire   +2 more sources

Linking Stress Drop and Slip Heterogeneity to Assess Source Rupture Directivity for Earthquakes in Central Italy

Terra Nova, Volume 38, Issue 3, Page 163-172, June 2026.
ABSTRACT In this study, we examine the relationship between Brune stress drop and fault slip where the stress drop is estimated using the Empirical Green's Function (EGF) method and slip distribution is derived from seismic and geodetic data inversion.
Calderoni Giovanna, Antonella Cirella, Aybige Akinci   +2 more
wiley   +1 more source

Deformation of δ‐AlOOH and Its Solid Solution With Phase H as a Potential Source of Intra‐Slab Seismic Anisotropy in the Mid‐Mantle

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Seismic anisotropy is widely observed near subduction zones in the mantle transition zone and uppermost lower mantle, particularly along the western Pacific rim and tracks slabs geometries, implying an additional slab‐related source. Hydrous phases such as δ‐AlOOH and phase H (MgSiO4H2), which form a solid solution (δ‐H) and are stable in cool,
Wentian Wu, Yu Nishihara, Noriyoshi Tsujino, Sho Kakizawa, Yuji Higo   +4 more
wiley   +1 more source

Are Estimates of Lower Continental Crust Bulk Composition Biased Due to Seismic Anisotropy?

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 5, May 2026.
Abstract Most seismic inferences on the bulk composition of the lower continental crust are based on P‐wave velocities inferred from seismic wide‐angle data, for which the direction of propagation in the target region is sub‐horizontal. Given the likely presence of anisotropy in many parts of the lower continental crust, these estimates could be biased
Zheng Luo
openalex   +2 more sources

Physical Properties of Iron in the Inner Core

, 2002
The Earth's inner core plays a vital role in the dynamics of our planet and is itself strongly exposed to dynamic processes as evidenced by a complex pattern of elastic structure.
Ahrens, Alfè, Alfè, Alfè, Alfè, Alfè, Alfè, Anderson, Anderson, Andrault, Asada, Aurnou, Barron, Bergman, Bergman, Bergman, Birch, Birch, Boehler, Boehler, Boehler, Braginsky, Brown, Brown, Brown, Brown, Brown, Brown, Bréger, Buffett, Buffett, Buffett, Buffett, Buffett, Buffett, Buffett, Bullen, Bullen, Clement, Cohen, Cohen, Cohen, Creager, Creager, Creager, Creager, Davies, de Wijs, Deuss, Dubrovinsky, Dubrovinsky, Duffy, Duffy, Dziewonski, Dziewonski, Eckerlin, Fiquet, Funamori, Glatzmaier, Glatzmaier, Gülseren, Hemley, Hill, Hohenberg, Hollerbach, Huang, Ishii, Ishii, Ito, Jackson, Jeanloz, Jeanloz, Jeanloz, Jeanloz, Jeanloz, Jephcoat, Jephcoat, Karato, Karato, Karato, Kohn, Kuang, Körling, Laio, Laske, Lehmann, Li, Lubbers, Lundqvist, Manghnani, Mao, Mao, Mao, Masters, Masters, Matsui, Matthies, Maurer, McMahon, Merkel, Merrill, Morelli, Moroni, Nguyen, Nielsen, Niu, Okal, Okuchi, Olijnyk, Olijnyk, Parrinello, Perdew, Pickett, Poirier, Poirier, Poupinet, Saxena, Shearer, Shen, Shen, Simmons, Singh, Singh, Singh, Singh, Song, Song, Song, Song, Song, Souriau, Stacey, Steinle-Neumann, Steinle-Neumann, Stixrude, Stixrude, Stixrude, Stixrude, Stixrude, Stixrude, Su, Su, Söderlind, Tanaka, Taylor, Tromp, Tromp, Troullier, Tsunoda, Uchida, Uhl, Verhoogen, Verhoogen, Vidale, Vočadlo, Wasserman, Watt, Wenk, Wenk, Wenk, Wentzcovitch, Williams, Woodhouse, Yagi, Yoo, Yoo, Yoshida, Yukutake, Yukutake   +168 more
core   +1 more source

ECOMAN: an open-source package for geodynamic and seismological modelling of mechanical anisotropy [PDF]

Solid Earth
Mechanical anisotropy related to rock fabrics is a proxy for constraining the Earth's deformation patterns. However, the forward and inverse modelling of mechanical anisotropy in 3D large-scale domains has been traditionally hampered by the intensive ...
M. Faccenda, B. P. VanderBeek, A. de Montserrat, J. Yang, F. Rappisi, N. Ribe   +5 more
doaj   +1 more source

Temporal Variations in Seismic Ambient Noise Identify Seasonal Changes in Basal Conditions at Sermeq Kujalleq in Kangia, Greenland

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Subglacial processes are key to glacier dynamics but remain poorly constrained due to limited in situ observations. We use continuous seismic and Global Navigation Satellite System (GNSS) measurements to investigate summer basal conditions at Sermeq Kujalleq in Kangia (SKK; Jakobshavn Isbræ), Kalaallit Nunaat (Greenland).
Janneke van Ginkel, Adrien Wehrlé, Ana Nap, Fabian Walter, Andrea Kneib‐Walter, Hugo Rousseau, Martin P. Lüthi   +6 more
wiley   +1 more source

Rare Helium-Bearing Compound FeO2He Stabilized at Deep-Earth Conditions

, 2018
There is compelling geochemical evidence for primordial helium trapped in Earth’s lower mantle, but the origin and nature of the helium source remain elusive due to scarce knowledge on viable helium-bearing compounds that are extremely rare.
Chen, Changfeng, Feng, Xiaolei, Li, Hefei, Liu, Hanyu, Lu, Cheng, Lv, Jian, Ma, Yanming, Redferm, Simon A. T., Zhang, Jurong   +8 more
core   +1 more source

Seismic Anisotropy Workshop

Eos, Transactions American Geophysical Union, 1987
P wave anisotropy, the direction dependence of P wave velocities, is widely recognized to exist in the crust and upper mantle. The anisotropic effects of layered media, of aligned crystals in ductile rock, and of aligned cracks in brittle rock have been observed or have been speculated to yield information on earth structure and geomechanical processes.
openaire   +1 more source