Depth to Moho in Greenland: receiver-function analysis suggests two Proterozoic blocks in Greenland

Dahl‐Jensen, Trine; Larsen, Tine B.; Woelbern, I.; Bach, Torben; Hanka, W.; Kind, R.; Gregersen, Søren; Mosegaard, Klaus; Voß, Peter; Guðmundsson, Ólafur

doi:10.1016/s0012-821x(02)01080-4

Cited by 101 publications

(121 citation statements)

References 35 publications

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“…The Moho map shown in Figure 14 (top) agrees well with the Moho map calculated by Braun et al (2007), for Greenland and its surrounding area. Also, a good agreement is found with the Moho depths calculated by Dahl-Jensen et al (2003), from receiver-function analysis.…”

Section: Resultssupporting

confidence: 74%

“…This information has been incorporated to the initial models, for the above-mentioned grid points (or blocks). Particularly, the Moho depths calculated by Dahl-Jensen et al (2003), for many places in Greenland, has been used to provide the Moho depth in the initial models, as well as the Moho depths predicted by the Moho map performed by Braun et al (2007). Thus, an initial model has been prepared for each grid point (or block) for depths ranging from 0 to 400 km.…”

Section: ̅ = Baxmentioning

confidence: 99%

“…These very old studies are relevant, in spite of the very limited data used. Later, Dahl-Jensen et al (2003) provided information about the Moho depth, in many locations in Greenland, calculated from receiver-function analysis. These depths have later been confirmed by other authors as Braun et al (2007), but they didn't perform any surface-wave tomography.…”

Section: Introductionmentioning

confidence: 99%

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Shear-wave Velocity Structure of Greenland from Rayleigh-wave Analysis

Corchete

2016

Earth sci. res. j.

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The elastic structure beneath Greenland is shown by means of S-velocity maps for depths ranging from zero to 350 km, determined by the regionalization and inversion of Rayleigh-wave dispersion. The traces of 50 earthquakes, occurring from 1990 to 2011, have been used to obtain Rayleigh-wave dispersion data. These earthquakes were registered by 21 seismic station located in Greenland and the surrounding area. The dispersion curves were obtained for periods between 5 and 200 s, by digital filtering with a combination of MFT (Multiple Filter Technique) and TVF (Time Variable Filtering). Later, all seismic events (and some stations) were grouped to obtain a dispersion curve for each source-station path. These dispersion curves were regionalized and inverted according to the generalized inversion theory, to obtain shear-wave velocity models for a rectangular grid of 16x20 points. The shear-velocity structure obtained through this procedure is shown in the S-velocity maps plotted for several depths. These results agree well with the geology and other geophysical results previously obtained. The obtained S-velocity models suggest the existence of lateral and vertical heterogeneity. The zones with consolidated and old structures present greater S-velocity values than the other zones, although this difference can be very little or negligible in some case. Nevertheless, in the depth range of 15 to 45 km, the different Moho depths present in the study area generate the principal variation of S-velocity. A similar behaviour is found for the depth range from 80 to 230 km, in which the lithosphere-asthenosphere boundary (LAB) generates the principal variations of S-velocity. Finally, the new and interesting feature obtained in this study: the definition of the base of the asthenosphere (for the whole study area and for depths ranging from 130 to 280 km, respectively) should be highlighted.La estructura elástica bajo Groenlandia es mostrada por medio de mapas de velocidad de onda para profundidades variando desde cero a 350 km, determinada por la regionalización e inversión de la dispersión de onda Rayleigh. Las trazas de 50 terremotos, ocurridos desde 1990 hasta 2011, han sido usados para obtener datos de dispersión de onda Rayleigh. Estos terremotos fueron registrados por 21 estaciones sísmicas localizadas en Groenlandia y el área circundante. Las curvas de dispersión fueron obtenidas para periodos entre 5 y 200 s, por filtrado digital con una combinación de MFT (Técnica de Filtrado Múltiple) y TVF (Filtrado en Tiempo Variable). Después, todos los eventos sísmicos (y algunas estaciones) fueron agrupados para obtener una curva de dispersión para cada trayecto fuente-estación. Estas curvas de dispersión fueron regionalizadas e invertidas de acuerdo con la teoría de la inversión generalizada, para obtener modelos de velocidad de cizalla para una rejilla rectangular de 16x20 puntos. La estructura de velocidad de cizalla obtenida a través de este procedimiento es mostrada in los mapas de velocidad de onda S representados para var...

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Section: Resultssupporting

confidence: 74%

Section: ̅ = Baxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shear-wave Velocity Structure of Greenland from Rayleigh-wave Analysis

Corchete

2016

Earth sci. res. j.

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“…For temporary passive experiments, this is even bigger problem, due to the limited number of events. Usually during 1 year of a campaign, only about few tens of good quality records, with magnitude M≥5.5, are collected Gregersen et al 2006;Wilde-Piórko et al 2008 (2005) and Geissler et al (2008) differ only by about ±1 km; however, in other regions, differences can reach more than ±5 km, as is the case for Greenland (Dahl-Jensen et al 2003;Kumar et al 2007). & In seismic refraction and wide angle reflection method observed PmP waves are weak for weak contrast at the Moho (gradient Moho zone).…”

Section: Discussion Of the Deviations Uncertainties And Errorsmentioning

confidence: 99%

Moho depth of the European Plate from teleseismic receiver functions

Grad

Tiira

2011

J Seismol

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“…For the Greenland study, we used seismic data from the GLATIS and NEAT experiments [25,26]. During these experiments, seismic stations were deployed along the Greenland coast and on the ice sheet for periods ranging from several months to several years.…”

Section: Data and Observationsmentioning

confidence: 99%