Results 41 to 50 of about 164,377 (321)

Seismic anisotropy and shear-wave splitting in lower-crustal and upper-mantle rocks from the Ivrea Zone : experimental and calculated data [PDF]

open access: yes, 1996
International audienceTo quantify the relationships between anisotropy. S-wave splitting and tectonics, we determined the seismic properties of lower-crustal and upper-mantle rocks outcropping in the lvrea Zone (Northem Italy).
Barruol, Guilhem, Kern, Hartmut
core   +2 more sources

Characteristics Analysis of Three-Component Wave Field Based on Borehole Microseismic Data of Shear Wave Splitting

open access: yesCejing jishu, 2023
The wave field data which is monitored the fracturing crack by micro seismic in the well is complex, especially when the shear wave (S-wave) encounters the fracture. The shear wave will split into the fast or slow wave. The polarization directions of the
WEN Rou   +5 more
doaj   +1 more source

Apparent Splitting of S Waves Propagating Through an Isotropic Lowermost Mantle [PDF]

open access: yes, 2018
Observations of shear wave anisotropy are key for understanding the mineralogical structure and flow in the mantle. Several researchers have reported the presence of seismic anisotropy in the lowermost 150–250 km of the mantle (i.e., D urn:x-wiley:jgrb ...
Ferreira, Ana M. G.   +2 more
core   +3 more sources

Mantle Flow Pattern Associated With the Patagonian Slab Window Determined From Azimuthal Anisotropy

open access: yesGeophysical Research Letters, 2022
Geological processes in Southern Patagonia are affected by the Patagonian slab window, formed by the subduction of the Chile Ridge and subsequent northward migration of the Chile Triple Junction.
Walid Ben‐Mansour   +6 more
doaj   +1 more source

The Turkish Dilatancy Project (TDP3): multidisciplinary studies of a potential earthquake source region [PDF]

open access: yes, 1987
The section of the North Anatolian Fault lying near the city of Izmit, at the east of the Marmara Sea, has been identified as a seismic gap and the possible site of a future major earthquake.
Beamish, David   +3 more
core   +1 more source

Finite-Frequency SKS Splitting: Measurement and Sensitivity Kernels [PDF]

open access: yes, 2008
Splitting of SKS waves caused by anisotropy may be analyzed by measuring the splitting intensity, i.e., the amplitude of the transverse signal relative to the radial signal in the SKS time window. This quantity is simply related to structural parameters.
Paulssen, Hanneke   +3 more
core   +1 more source

Seismic Anisotropy Analysis Beneath Sumatra Revealed by Shear-Wave Splitting

open access: yesIndonesian Journal on Geoscience, 2017
DOI: 10.17014/ijog.4.3.169-179A shear-wave splitting analysis was determined to observe anisotropic structures of an upper mantle layer beneath Sumatra.
Arya Dwi Candra   +2 more
doaj   +1 more source

Sub-slab mantle anisotropy beneath south-central Chile [PDF]

open access: yes, 2012
Knowledge of mantle flow in convergent margins is crucial to unravelling both the contemporary geodynamics and the past evolution of subduction zones. By analysing shear-wave splitting in both teleseismic and local arrivals, we can determine the relative
Hicks, Stephen P.   +2 more
core   +1 more source

Upper crust anisotropy of the 2020 Jiashi MS 6.4 earthquake

open access: yesFrontiers in Earth Science, 2023
The 2020 Jiashi MS 6.4 earthquake occurred north of the 1997–1998 Jiashi earthquake swarm. Because of its complex tectonic environment and frequent strong earthquake occurrence, scholars have paid extensive attention to this area.
Jin Li   +4 more
doaj   +1 more source

Complex anisotropy beneath the Peruvian flat slab from frequency-dependent, multiple-phase shear wave splitting analysis [PDF]

open access: yes, 2013
Flat or shallow subduction is a relatively widespread global occurrence, but the dynamics remain poorly understood. In particular, the interaction between flat slabs and the surrounding mantle flow has yet to be studied in detail.
Eakin, Caroline M., Long, Maureen D.
core   +1 more source

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