Analysis of waves converted from S to P in the upper mantle beneath the Baltic Shield

Olsson, Sverker; Roberts, Roland; Böðvarsson, Reynir

doi:10.1016/j.epsl.2007.02.017

Cited by 27 publications

(29 citation statements)

References 23 publications

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“…Kimberlite facies in crustal rocks contain mantle xenoliths and these provide a basis for extrapolating temperature and composition to larger depths using seismology (Stein et al, 1989;Bruneton et al, 2004;Hjelt et al, 2006;Olsson et al, 2006Olsson et al, , 2007Pedersen et al, 2006). These results can be used to develop more realistic models of Fig.…”

Section: Evidence From Geophysical Observations Of Lithosphere Structurementioning

confidence: 94%

DynaQlim – Upper Mantle Dynamics and Quaternary Climate in Cratonic Areas

Poutanen

Dransch

Gregersen

et al. 2009

New Frontiers in Integrated Solid Earth Sciences

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The isostatic adjustment of the solid Earth to the glacial loading (GIA, Glacial Isostatic Adjustment) with its temporal signature offers a great opportunity to retrieve information of Earth's upper mantle to the changing mass of glaciers and ice sheets, which in turn is driven by variations in Quaternary climate. DynaQlim (Upper Mantle Dynamics and Quaternary Climate in Cratonic Areas) has its focus to study the relations between upper mantle dynamics, its composition and physical properties, temperature, rheology, and Quaternary climate. Its regional focus lies on the cratonic areas of northern Canada and Scandinavia.Geodetic methods like repeated precise levelling, tide gauges, high-resolution observations of recent movements, gravity change and monitoring of postglacial faults have given information on the GIA process for more than 100 years. They are accompanied by more recent techniques like GPS observations and the GRACE and GOCE satellite missions which provide additional global and regional constraints on the gravity field. Combining geodetic observations with seismological investigations, studies of the postglacial faults and continuum mechanical modelling of GIA, DynaQlim offers new insights into properties of the lithosphere. Another step toward a better understanding of GIA has been the joint inversion of different types of observational data -preferentially connected with geological relative sea-level evidence of the Earth's rebound during the last 10,000 years.Due to the changes in the lithospheric stress state large faults ruptured violently at the end of the last M. Poutanen ( ) Finnish Geodetic Institute, Geodeetinrinne 2, 02430 Masala, Finland e-mail: markku.poutanen@fgi.fi glaciation in large earthquakes, up to the magnitudes M W = 7-8. Whether the rebound stress is still able to trigger a significant fraction of intraplate seismic events in these regions is not completely understood due to the complexity and spatial heterogeneity of the regional stress field. Understanding of this mechanism is of societal importance.Glacial ice sheet dynamics are constrained by the coupled process of the deformation of the viscoelastic solid Earth, the ocean and climate variability. Exactly how the climate and oceans reorganize to sustain growth of ice sheets that ground to continents and shallow continental shelves is poorly understood. Incorporation of nonlinear feedback in modelling both ocean heat transport systems and atmospheric CO 2 is a major challenge. Climate-related loading cycles and episodes are expected to be important, hence also more shortterm features of palaeoclimate should be explicitly treated.

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Section: Evidence From Geophysical Observations Of Lithosphere Structurementioning

confidence: 94%

DynaQlim – Upper Mantle Dynamics and Quaternary Climate in Cratonic Areas

Poutanen

Dransch

Gregersen

et al. 2009

New Frontiers in Integrated Solid Earth Sciences

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“…The Svekalapko Seismic Tomography Working Group (2004) found the LAB at 100-130 km depth below Finland in wideangle data. Olsson et al (2007) applied the S receiver function technique to data of the Swedish National Seismic Network and found a layered structure of the upper mantle with the LAB near 200 km. Geissler et al (2010) studied the LAB at permanent seismic stations in Central Europe with S receiver functions.…”

Section: Europe and The Middle Eastmentioning

confidence: 99%

Deep Earth Structure - Transition Zone and Mantle Discontinuities

Kind

2015

Treatise on Geophysics

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“…They are also noisy because of interference from adverse phases (e.g. see Olsson et al 2007). P receiver functions are of higher frequency, but are susceptible to complications from interfering crustal multiples (e.g.…”

Section: Discussionmentioning

confidence: 99%

On the P and S Receiver Functions Used for Inverting the One-Dimensional Upper Mantle Shear-Wave Velocities

Çakır

Erduran

2010

Surv Geophys

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The teleseismic P receiver functions are customarily inverted to attain the seismic velocities beneath a seismic station. Surface wave dispersion data are often added to reduce the effect of the non-uniqueness. The combination of P receiver function and surface wave works well in resolving the structures in the crust and uppermost mantle, but is less effective in characterizing greater (lithosphere and asthenosphere) depths due to the interference from crustal multiples. A solution to this problem is jointly to model teleseismic S receiver functions with surface wave and P receiver functions. This study adopts a fast, one-dimensional (1-D) inversion scheme. To avoid the effect of multidimensional structures away from the seismic station, we eliminate multiples that reverberate between the surface and interfaces below a restriction depth (RD), as well as S-to-P conversions below an inversion depth (ID). P-to-S conversions off the interfaces above the half-space and S-to-P conversions above the ID and multiples above the RD are properly modelled. This approach favours ray paths travelling close to stations and is, therefore, more suitable for 1-D inversions. We perform numerical experiments with and without noise and highlight the advantages of a joint receiver function and surface wave analysis.

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Analysis of waves converted from S to P in the upper mantle beneath the Baltic Shield

Cited by 27 publications

References 23 publications

DynaQlim – Upper Mantle Dynamics and Quaternary Climate in Cratonic Areas

DynaQlim – Upper Mantle Dynamics and Quaternary Climate in Cratonic Areas

Deep Earth Structure - Transition Zone and Mantle Discontinuities

On the P and S Receiver Functions Used for Inverting the One-Dimensional Upper Mantle Shear-Wave Velocities

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