Seismic Location Calibration of the European Arctic

Kremenetskaya, Elena; Асминг, В. Э.; Ringdal, Frode

doi:10.1007/pl00001151

Cited by 67 publications

(16 citation statements)

References 5 publications

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“…Fig. 12), a slightly modified version of the Barents Sea model by Kremenetskaya et al (2001) on top of model ak135 (Kennett et al 1995), is superior to other models for locating seismic events in the wider Barents Sea region. However, because of the known differences in the crustal structure, any 1-D model will have its limits in describing the velocity structure of the region.…”

Section: Barentsmentioning

confidence: 98%

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Surface wave tomography of the Barents Sea and surrounding regions

Levshin

Schweitzer

Weidle

et al. 2007

Geophysical Journal International

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International audienceThe goal of this study is to refine knowledge of the structure and tectonic history of the European Arctic using the combination of all available seismological surface wave data, including historical data that were not used before for this purpose. We demonstrate how the improved data coverage leads to better depth and spatial resolution of the seismological model and discovery of intriguing features of upper-mantle structure. To improve the surface wave data set in the European Arctic, we extensively searched for broad-band data from stations in the area from the beginning of the 1970s until 2005. We were able to retrieve surface wave observations from regional data archives in Norway, Finland, Denmark and Russia in addition to data from the data centres of IRIS and GEOFON. Rayleigh and Love wave group velocity measurements between 10 and 150 s period were combined with existing data provided by the University of Colorado at Boulder. This new data set was inverted for maps showing the 2-D group-velocity distribution of Love and Rayleigh waves for specific periods. Using Monte Carlo inversion, we constructed a new 3-D shear velocity model of the crust and upper mantle beneath the European Arctic which provides higher resolution and accuracy than previous models. A new crustal model of the Barents Sea and surrounding areas, published recently by a collaboration between the University of Oslo, NORSAR and the USGS, constrains the 3-D inversion of the surface wave data in the shallow lithosphere. The new 3-D model, BARMOD, reveals substantial variations in shear wave speeds in the upper mantle across the region with a nominal resolution of 1° × 1°. Of particular note are clarified images of the mantle expression of the continent-ocean transition in the Norwegian Sea and a deep, high wave speed lithospheric root beneath the Eastern Barents Sea, which presumably is the remnant of several Palaeozoic collisions

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Section: Barentsmentioning

confidence: 98%

“…monitoring seismic activity within the region, which includes the Soviet nuclear test site at Novaya Zemlya. Kremenetskaya et al (2001) published a 1-D velocity model for the wider Barents Sea region. Hicks et al (2004) demonstrated that the 1-D model called Barey (Schweitzer & Kennett 2002, cf.…”

Section: Barentsmentioning

confidence: 99%

Surface wave tomography of the Barents Sea and surrounding regions

Levshin

Schweitzer

Weidle

et al. 2007

Geophysical Journal International

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“…The new 3-D velocity model developed here may also replace the simple crustal velocity models of Kremenetskaya et al (2001) and Schweitzer & Kennett (2002) derived from regional seismological analysis in the European Arctic. These models are mainly averages of various local models and, therefore, do not account for the geological diversity found in the Barents Sea region.…”

Section: Previous Crustal Modelsmentioning

confidence: 99%

A three-dimensional geophysical model of the crust in the Barents Sea region: model construction and basement characterization

Ritzmann¹,

Maercklin

Faleide

et al. 2007

Geophysical Journal International

100

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S U M M A R YBARENTS50, a new 3-D geophysical model of the crust in the Barents Sea Region has been developed by the University of Oslo, NORSAR and the U.S. Geological Survey. The target region comprises northern Norway and Finland, parts of the Kola Peninsula and the East European lowlands. Novaya Zemlya, the Kara Sea and Franz-Josef Land terminate the region to the east, while the Norwegian-Greenland Sea marks the western boundary. In total, 680 1-D seismic velocity profiles were compiled, mostly by sampling 2-D seismic velocity transects, from seismic refraction profiles. Seismic reflection data in the western Barents Sea were further used for density modelling and subsequent density-to-velocity conversion. Velocities from these profiles were binned into two sedimentary and three crystalline crustal layers. The first step of the compilation comprised the layer-wise interpolation of the velocities and thicknesses. Within the different geological provinces of the study region, linear relationships between the thickness of the sedimentary rocks and the thickness of the remaining crystalline crust are observed. We therefore, used the separately compiled (area-wide) sediment thickness data to adjust the total crystalline crustal thickness according to the total sedimentary thickness where no constraints from 1-D velocity profiles existed. The BARENTS50 model is based on an equidistant hexagonal grid with a node spacing of 50 km. The P-wave velocity model was used for gravity modelling to obtain 3-D density structure. A better fit to the observed gravity was achieved using a grid search algorithm which focussed on the density contrast of the sediment-basement interface. An improvement compared to older geophysical models is the high resolution of 50 km. Velocity transects through the 3-D model illustrate geological features of the European Arctic. The possible petrology of the crystalline basement in western and eastern Barents Sea is discussed on the basis of the observed seismic velocity structure. The BARENTS50 model is available at http://www.norsar.no/seismology/barents3d/.

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“…В качестве скоростных моделей были опробованы следующие 1D модели: BARENTS [Kremenetskaya et al, 2001], BAREY и BAREZ [Schweitzer, Kennett, 2007] и NORP [Морозов, Ваганова, 2011]. Модель BARENTS была разработана для Фенноскандии, Балтийского щита и прилегающих районов.…”

Section: Nunclassified

The present-day seismicity of the White Sea region

Morozov

Vaganova

Асминг

et al. 2019

Вулканология и сейсмология

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A revised earthquake catalog has been compiled for the White Sea region for the period between 2005 and 2016. The earthquake parameters were revised using a single velocity model (BARENTS), a single methodological approach (Generalized Beamforming), and all available raw data and bulletins of Russian and foreign seismic stations. The location of two nuclear explosions detonated on July 18, 1985 and September 6, 1988 in northern European Russia for civilian purposes showed that the algorithm for calculating hypocenter parameters combined with the BARENTS velocity model is an effective tool. The resulting earthquake catalog enabled us to reveal the leading patterns in the distribution of recent seismicity in the White Sea region.

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Seismic Location Calibration of the European Arctic

Cited by 67 publications

References 5 publications

Surface wave tomography of the Barents Sea and surrounding regions

Surface wave tomography of the Barents Sea and surrounding regions

A three-dimensional geophysical model of the crust in the Barents Sea region: model construction and basement characterization

The present-day seismicity of the White Sea region

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