Crustal structure variation from the Precambrian to Palaeozoic platforms in Europe imaged by the inversion of teleseismic receiver functions-project TOR

Wilde−Piórko, Monika; Grad, M.

doi:10.1046/j.1365-246x.2002.01699.x

Cited by 28 publications

(15 citation statements)

References 31 publications

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“…However, the result of inversion depends on the starting model, in particular for noisy data. In order to receive independent results, we can run the inversion with many different starting models and then stack the results to calculate one mean model of the structure (e.g., Wilde-Piórko et al 2002). Forward modeling using trial-and-error method may find a simple model which could well explain the observed receiver functions.…”

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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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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“…The solution of the inverse problem can be affected by the starting model [Ammon et al, 1990] where an improper choice may steer the solution toward a local minimum. In addition to performing a series of inversions with perturbed starting models [Ammon et al, 1990;Mangino et al, 1993;Wilde-Piórko and Grad, 2002], we conduct a global solution search in model space based on the genetic algorithm (GA) [Shibutani et al, 1996]. This method simulates gene evolution in biological systems and solves nonlinear inverse problems through complete global optimization [Sambridge and Drijkoningen, 1992].…”

Section: 1002/2014jb011353mentioning

confidence: 99%

Crustal imprints of Precambrian orogenesis in western Laurentia

Chen

Dokht

et al. 2015

JGR Solid Earth

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Crustal low‐velocity zones (LVZs) have been reported in active orogens such as the Himalayas and the Andes but rarely in stable cratonic regions. In this study, we provide compelling evidence for a significant midcrustal LVZ beneath eastern‐central Alberta, an integral part of the Precambrian Canadian Shield covered by thick Phanerozoic sedimentary deposits. This 200 km wide, over 10 km thick midcrustal LVZ is well resolved by shear velocity inversions using P‐to‐S receiver functions from more than 4600 earthquakes. It is generally overlain by a high‐velocity upper crust in the depth range of 8–15 km, especially in western‐central Alberta, which coincides with the previously documented Winagami reflection sequence. We interpret the LVZ to be of granitic composition, potentially in connection with the crystallization of partially molten crust during the Paleoproterozoic eon. In addition to the Precambrian tectonic history of western Laurentia, which featured plate convergence conducive to crustal melting, our crustal model is further supported by (1) a moderate spatial correlation between the LVZ and heat flow, and (2) shear velocities consistent with that of granite. The well preserved Winagami reflection sequence and the LVZ are potential evidence of distinct episodes of magmatism and crust modification in the Precambrian basement of the Western Canada Sedimentary Basin. The existence of a broad crustal LVZ suggests extensive subduction, orogenesis, and crustal melting during the Precambrian assembly of the North American craton.

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“…Many studies already exist for this experiment using a range of seismological methods. Besides an overview of the experiment given by Gregersen et al (2002), among the studies are a teleseismic P tomography (Arlitt et al 1999), non‐linear P and S tomography studies (Shomali et al 2006; Voss et al 2006), receiver function studies (Gossler et al 1999; Wilde‐Piórko et al 2002; Alinaghi et al 2003) and anisotropy analyses (Wylegalla & TOR Working Group 1999; Plomerova & TOR Working Group 2002). However, none of the named studies used absolute traveltimes.…”

Section: Datamentioning

confidence: 99%

A new absolute arrival time data set for Europe

Amaru¹,

Spakman²,

Villaseñor

et al. 2008

Geophysical Journal International

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S U M M A R YThe main aim of this study is to create a data set of accurate absolute arrival times for stations in Europe which do not report to the International Seismological Centre (ISC). Waveforms were obtained from data centres and temporary experiments and a semi-automatic picking method was applied to determine absolute arrival times for P and S phases. 85 000 arrival times were picked whose distribution of residuals shows generally low standard deviations on the order of 0.5-0.7 s. Furthermore, mean teleseismic station residuals reflect the properties of the underlying crust and uppermost mantle. Comparison to ISC data for matching event-stationphase combinations also confirms the good quality of the new absolute arrival time picks. Most importantly, this data set complements the ISC data as it fills regional data coverage gaps in Europe.Arrival times are routinely reported by many seismological networks to the International Seismological Centre (ISC), resulting in bulletins of millions of arrival times since 1964. Clearly, a wealth of information can be gained from these data regarding the Earth's interior for example by application of traveltime tomography. However, the reporting stations are not distributed equally over the globe therefore leaving gaps, in particular, in the oceans and stable cratonic regions. Furthermore, the quality of these data, which are mostly handpicked, varies greatly .Besides stations included in arrival time bulletins, a large number of seismic stations exist whose waveforms are not used routinely but are sent to data centres for digital storage. For many events included in these waveforms, arrival times were either not picked at all or only with limitations (e.g. a restricted period in time or limited epicentral distance range).Another valuable source of data is provided by temporary experiments. To fill the geographical gaps, many regional experiments were carried out during the last 15-20 yr where spatially dense temporary networks were placed in the field for several months. Often, arrival times for events registered at those arrays were only picked relatively. That means, not the arrival time of a phase onset was determined but the arrival time of the first maximum or minimum after the onset. This procedure has the advantage that observational errors due to high noise levels can be reduced but as a major disadvantage, * Now at: Chevron Energy Technology Company, Houston, TX, USA. arrival times are only obtained with respect to the unknown mean network arrival time for a specific event. Therefore, they cannot be used for event relocation or to obtain absolute velocity information on the crust and mantle below the array. Consequently, obtaining absolute arrival times for events recorded at such stations which do not report arrival times to the ISC can provide new detailed information for high-resolution traveltime tomography.Besides using additional stations, the picks should also be of a consistent good quality as erroneous picks will affect or overprint velocity structur...

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Crustal structure variation from the Precambrian to Palaeozoic platforms in Europe imaged by the inversion of teleseismic receiver functions-project TOR

Cited by 28 publications

References 31 publications

Moho depth of the European Plate from teleseismic receiver functions

Moho depth of the European Plate from teleseismic receiver functions

Crustal imprints of Precambrian orogenesis in western Laurentia

A new absolute arrival time data set for Europe

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