Search Results - "Pedersen, Helle A."

Impacts of non-plane waves on two-station measurements of phase velocities by Pedersen, Helle A.

“…To determine the regional shear wave velocities in the lithosphere it is frequently necessary to use two-station dispersion curves. We investigate the…”
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Mapping the seismic noise field in Europe: spatio-temporal variations in wavefield composition and noise source contributions by Lu, Yang, Pedersen, Helle A, Stehly, Laurent

“…SUMMARY We study spatial and temporal characteristics of the microseismic noise field across Europe. Rather than focusing on the areas of noise generation, the…”
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Imaging with seismic noise: improving extraction of body wave phases from the deep Earth through selective stacking based on H/V ratios by Pedersen, Helle A, Mattern, Flavien, Poli, Piero, Stehly, Laurent

“…SUMMARY Generating high-resolution images of the deep Earth remains a challenge. Body waves extracted from noise correlations hold high promise to complement…”
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Seismic monitoring of the Indian Ocean tsunami by Yuan, Xiaohui, Kind, Rainer, Pedersen, Helle A.

“…The 26 December 2004 Sumatra‐Andaman earthquake of Mw 9.3 triggered a massive tsunami in the Indian Ocean. We here report on observations of the Indian Ocean…”
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Imaging the D″ reflector with noise correlations by Poli, Piero, Thomas, Christine, Campillo, Michel, Pedersen, Helle A.

“…The lowermost mantle of the Earth is characterized by seismic structures that range from a few tens to thousands of kilometers. At present, it is difficult to…”
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Bayesian analysis of azimuthal anisotropy in the Alpine lithosphere from beamforming of ambient noise cross-correlations by Soergel, Dorian, Pedersen, Helle A, Bodin, Thomas, Paul, Anne, Stehly, Laurent

“…SUMMARY Surface waves extracted from ambient noise cross-correlations can be used to study depth variations of azimuthal anisotropy in the crust and upper…”
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High‐resolution surface wave tomography beneath the Aegean‐Anatolia region: constraints on upper‐mantle structure by Salaün, Gwénaëlle, Pedersen, Helle A., Paul, Anne, Farra, Véronique, Karabulut, Hayrullah, Hatzfeld, Denis, Papazachos, Costas, Childs, Dean M., Pequegnat, Catherine

“…SUMMARY This study provides new constraints on the upper‐mantle structure from western Greece to central Anatolia using seismic data of permanent broad‐band…”
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Lithospheric and sublithospheric anisotropy beneath the Baltic shield from surface-wave array analysis by Pedersen, Helle A., Bruneton, Marianne, Maupin, Valérie

“…We report measurements of radial and azimuthal anisotropy in the upper mantle beneath southern and central Finland, which we obtained by array analysis of…”
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Complex lithospheric structure under the central Baltic Shield from surface wave tomography by Bruneton, Marianne, Pedersen, Helle A., Farra, Véronique, Arndt, Nicholas T., Vacher, Pierre, Achauer, U., Alinaghi, A., Ansorge, J., Bock, G., Friederich, W., Grad, M., Guterch, A., Heikkinen, P., Hjelt, S.-E., Hyvönen, T. L., Ikonen, J.-P., Kissling, E., Komminaho, K., Korja, A., Kozlovskaya, E., Nevsky, M. V., Paulssen, H., Pavlenkova, N. I., Plomerová, J., Raita, T., Riznichenko, O. Y., Roberts, R. G., Sandoval, S., Sanina, I. A., Sharov, N. V., Shomali, Z. H., Tiikkainen, J., Wielandt, E., Wilegalla, K., Yliniemi, J., Yurov, Y. G.

“…Regional seismic tomography provides valuable information on the structure of shields, thereby gaining insight to the formation and stabilization of old…”
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Anomalous surface waves from Lop Nor nuclear explosions: Observations and numerical modeling by Pedersen, Helle A., Avouac, Jean‐Philippe, Campillo, Michel

“…Surface waves from the Chinese test site of Lop Nor are analyzed using long‐period and broadband stations located at regional and teleseismic distances and at…”
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Layered lithospheric mantle in the central Baltic Shield from surface waves and xenolith analysis by Bruneton, Marianne, Pedersen, Helle A., Vacher, Pierre, Kukkonen, Ilmo T., Arndt, Nicholas T., Funke, Sigward, Friederich, Wolfgang, Farra, Véronique

“…Information on the structure of the upper mantle comes from two main sources. Regional seismic studies provide indirect information on large portions of the…”
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A first detailed look at the Greenland lithosphere and upper mantle, using Rayleigh wave tomography by Darbyshire, Fiona A., Larsen, Tine B., Mosegaard, Klaus, Dahl‐Jensen, Trine, Gudmundsson, Ólafur, Bach, Torben, Gregersen, Søren, Pedersen, Helle A., Hanka, Winfried

“…SUMMARY We present the results of a surface wave study carried out across Greenland as part of the ‘GLATIS’ (Greenland Lithosphere Analysed Teleseismically on…”
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Seismic evidence for depth-dependent metasomatism in cratons by Eeken, Thomas, Goes, Saskia, Pedersen, Helle A., Arndt, Nicholas T., Bouilhol, Pierre

“…The long-term stability of cratons has been attributed to low temperatures and depletion in iron and water, which decrease density and increase viscosity…”
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New Developments in Passive Seismic Imaging and Monitoring Methodological advances on seismic noise imaging in the Alpine area by Paul, Anne, Pedersen, Helle A, Bodin, Thomas, Kästle, Emanuel, Soergel, Dorian, Alder, Chloé, Lu, Yang, Nouibat, Ahmed

“…Methodological advances in seismic tomography are often driven by the quality of data sets. The dense and homogeneous spatial coverage of the AlpArray seismic…”
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Coda-Q in the 2.5s -20s period band from seismic noise - Application to the greater Alpine area by Soergel, Dorian, Pedersen, Helle A, Stehly, Laurent, Margerin, Ludovic, Paul, Anne, Working Group, Alparray

“…Coda-Q is used to estimate the attenuation and scattering properties of the Earth (Aki & Chouet 1975). So far focus has been on earthquake data at frequencies…”
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Body waves from a single source area observed in noise correlations at arrival times of reflections from the 410 discontinuity by Pedersen, HA, Colombi, A

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Methodological advances in seismic noise imaging of the Alpine area by Paul, Anne, Pedersen, Helle A., Bodin, Thomas, Kästle, Emanuel, Soergel, Dorian, Alder, Chloé, Lu, Yang, Nouibat, Ahmed

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Imaging the D″ reflector with noise correlations: Imaging the D" reflector by Poli, Piero, Thomas, Christine, Campillo, Michel, Pedersen, Helle A.

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Imaging the D double prime reflector with noise correlations by Poli, Piero, Thomas, Christine, Campillo, Michel, Pedersen, Helle A

“…The lowermost mantle of the Earth is characterized by seismic structures that range from a few tens to thousands of kilometers. At present, it is difficult to…”
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Shear wave velocities in the upper mantle of the Western Alps: new constraints using array analysis of seismic surface waves by Lyu, Chao, Pedersen, Helle A., Paul, Anne, Zhao, Liang, Solarino, Stefano

“…It remains challenging to obtain absolute shear wave velocities of heterogeneities of small lateral extension in the uppermost mantle. This study presents a…”
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