Results 21 to 30 of about 1,557 (307)
Active seismic studies in valley glacier settings: strategies and limitations
Journal of Glaciology, 2018 Subglacial tills play an important role in glacier dynamics but are difficult to characterize in situ. Amplitude Variation with Angle (AVA) analysis of seismic reflection data can distinguish between stiff tills and deformable tills.
JENNA M. ZECHMANN +5 more
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Surface-consistent amplitude corrections for single or multicomponent sources and receivers using reciprocity and waveform inversion [PDF]
, 2006 In land seismics, near-surface conditions often vary within surveys, resulting in differences in source strength and signature. Furthermore, discrepancies between closely spaced recordings are also commonly observed.
J. Trampert +5 more
core +1 more source
P-wave velocity changes in freezing hard low-porosity rocks: a laboratory-based time-average model [PDF]
The Cryosphere, 2012 P-wave refraction seismics is a key method in permafrost research but its applicability to low-porosity rocks, which constitute alpine rock walls, has been denied in prior studies.
D. Draebing, M. Krautblatter
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Seismic Prediction While Drilling (SPWD): Looking Ahead of the Drill Bit by Application of Phased Array Technology [PDF]
Scientific Drilling, 2010 Geophysical exploration is indispensable for planning deep drilling. Usually 2D- or 3D-seismics investigations are applied and, depending on the resulting geologic model for the underground, the drill site and drilling path are determined.
Marco Groh +7 more
doaj +1 more source
Annals of Glaciology, 2019 We compared elastic moduli in polar firn derived from diving wave refraction seismic velocity analysis, firn-core density measurements and microstructure modelling based on firn-core data.
Rebecca Schlegel +8 more
doaj +1 more source
Geological Society of America Bulletin, 1941 This paper is intended: (1) to give an account of the relative seismicity of various parts of the earth during the limited period for which accurate information is available, and (2) to identify and discuss the geographical and geological relationships of the principal zones and areas of seismic activity.
Gutenberg, B., Richter, C. F.
openaire +2 more sources
Seismicity and seismic hazards
, 2001 Many earthquakes occur along Canada's western margin near the edge of the North American Plate, but others occur within the plate in Arctic and southeastern Canada. Damaging earthquakes have occurred throughout history in both Eastern and Western Canada, and will undoubtedly recur in the future.
J J Adams, P Basham
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Wet subglacial bedforms of the NE Greenland Ice Stream shear margins
Annals of Glaciology, 2019 We describe elongate, wet, subglacial bedforms in the shear margins of the NE Greenland Ice Stream and place some constraints on their formation. Lateral shear margin moraines have been observed across the previously glaciated landscape, but little is ...
Kiya L. Riverman +8 more
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Basic Geophysics Wide - Angle Seismics
, 2019 How deeply can applied seismics look into the Earth? Explanation of the branches of the travel time graphs, source and receiver arrangements, differences between vertical and wide-angle seismics, sample data and evaluation of the Transalp ...
Barth, Andreas
core +1 more source
Basic Geophysics - Surface Wave Seismics
, 2019 Are surface waves seismic interference signals? Advantages and applications of surface wave seismics, use of the dispersive properties, inversion of the dispersion curve to a velocity ...
Barth, Andreas
core +1 more source