Results 131 to 140 of about 4,259,217 (301)

3D chirp sub-bottom imaging system: design and first 3D volume

, 2005
Chirp sub-bottom profilers are marine acoustic devices that use a known and repeatable source signature (1 – 24 kHz) to produce decimetre vertical resolution crosssections of the sub-seabed.
Henstock, Timothy J., White, Paul R., Bull, Jonathan M., Hogarth, Peter, Leighton, Timothy G., Gutowski, Martin, Dix, Justin K.   +6 more
core   +1 more source

New constraints on the postglacial evolution of Lago Maggiore, Northern Italy

Journal of Quaternary Science, EarlyView.
ABSTRACT Lago Maggiore is situated in an overdeepened valley reach at the southern margin of the European Alps, and its thick sediment infill allows the reconstruction of the postglacial valley and lake evolution. We study here the sedimentary succession in the lower Ossola Valley, which is infilled by ~500 m of deposits. In a marginal position, a core
Lukas Gegg, Alexander Fülling, Andrew Greenwood, György Hetényi, F. Martin Hofmann, Giovanni Monegato, Jahir S. Rangel Herrera, Camille Schirra, Marco Venier, Othmar Müntener   +9 more
wiley   +1 more source

Energy budgeting of laboratory hydraulic fracturing in granite with different viscosity injection fluids

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
In this study, we investigated the source parameters of microseismicity detected during laboratory hydraulic fracturing (HF) of granite conducted with high- (gear oil/1000 cP) and low- (water/1 cP) viscosity injection fluids.
A. Butt, A. Hedayat, O. Moradian
doaj   +1 more source

The rise and fall of a volcanic plateau: Landscape evolution at the fringes of the former Patagonian Ice Sheet, Meseta Chile Chico, central Patagonian Andes

Journal of Quaternary Science, EarlyView.
ABSTRACT Understanding Earth‐surface processes along the fringes of large ice sheets is integral to deciphering cold‐region environmental variability and anticipating slope instability under climate change. We investigate the Meseta Chile Chico, a volcanic plateau in the central Patagonian Andes, located at the eastern margin of the former Patagonian ...
Carolina Franco, Emma‐Louise Cooper, Antonio Maldonado, María Eugenia de Porras, Amalia Nuevo‐Delaunay, César Méndez, Varyl R. Thorndycraft, Alessa Geiger, Bernd Zolitschka   +8 more
wiley   +1 more source

Ionospheric GNSS Imagery of Seismic Source: Possibilities, Difficulties, and Challenges. [PDF]

J Geophys Res Space Phys, 2019
Astafyeva E, Shults K.
europepmc   +1 more source

Climate‐modulated accumulation and erosion of sediments in the Rodderberg crater basin for the last 439 ka (East Eifel Volcanic Field, Germany)

Journal of Quaternary Science, EarlyView.
ABSTRACT Glacial/interglacial climate cycles since marine isotope stage (MIS) 12 influenced the discontinuous and 73 m‐long sediment record from the volcanic crater of Rodderberg in the East Eifel Volcanic Field, Germany. High‐resolution grain size and geochemical data have been valued by numerical dating techniques (radiocarbon and luminescence dating,
Bernd Zolitschka, Ines Hogrefe, An‐Sheng Lee, Maarit Kalliokoski, Manfred Frechen   +4 more
wiley   +1 more source

A large ice‐dammed lake in the western Danish North Sea: Deglacial evolution and ice‐margin dynamics

Journal of Quaternary Science, EarlyView.
Abstract The Last Glacial Maximum (LGM) ice extent in the western Danish North Sea remains unchartered, which impedes our understanding of the last glacial to Holocene transition in the region. Despite increasing interest in the shallow subsurface of the North Sea, there is still a knowledge gap concerning this transition.
Lasse Tésik Prins, Lis Allaart, Katrine Elnegaard Hansen, Katrine Juul Andresen, Ole Bennike, Bodil Wesenberg Lauridsen, Paul C. Knutz   +6 more
wiley   +1 more source

An All‐At‐Once Solver for Visco‐Acoustic Full Waveform Inversion in the Time‐Domain

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT Full waveform inversion (FWI) is the cutting‐edge seismic imaging technique used to reconstruct subsurface material properties such as wave velocities, mass density, and attenuation from measurements of reflected wavefields. In this article, we present the first implementation of FWI in the visco‐acoustic regime, based on a new time‐domain all‐
Christian Rheinbay, Andreas Rieder
wiley   +1 more source

Seismic vibration source [PDF]

The Journal of the Acoustical Society of America, 1979
Warren L. Dowler, Giulio Varsi, Lien C. Yang   +2 more
openaire   +1 more source

Seismic Stratigraphy and Geomorphology of Palaeocene Volcanic Rocks, Faroe-Shetland Basin [PDF]

, 2013
2D and 3D seismic reflection data in the Faroe-Shetland Basin have been used to remotely study buried, large-scale Palaeocene volcanic structures emplaced during continental flood basalt volcanism in the Faroe-Shetland Basin.
WRIGHT, KIRSTIE,ANNE-MARIE
core