General features of the uppermost mantle stratification from long-range seismic profiles

Павленкова, Н. И.

doi:10.1016/s0040-1951(96)00131-x

Cited by 44 publications

(28 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…4). A slightly less strong, but still good consistency is observed between the position layer bottoms and crustal reflectors identified by Pavlenkova (1996) and Pavlenkova et al (2002). According to the available data, the K 1 and K 2 discontinuities in the ASFA crust (Lind et al, 2004) lie near the bottom of the highly deformed upper layer, corresponding to the seismogenic crust in the area.…”

Section: Figurementioning

confidence: 90%

“…The seismicity pattern was imaged using earthquake catalog data from a special earthquake catalog for Northern Eurasia (Ulomov and Shumilina, 1999), with historic and instrumental seismicity (Sibgatulin et al, 2009). In order to correlate our results with the deep structure of the area, reference was made to published and unpublished (open-file field reports) survey data and models obtained at several survey, research, and academic institutions (Alakshin et al, 1988(Alakshin et al, , 1991Pavlenkova, 1996;Egorkin, 1999;Mats et al, 2001;Pavlenkova et al, 2002;Toib, 2002;Lind et al, 2004;Lifshiz et al, 2005). In addition to published and archived literature, we used the available maps of the ASFA (Zyat'kova, 1977;Nikolaev, 1982;Trifonov, 1986;Bezzubtsev et al, 2000;Grachev, 2000); quantitative parameters were calculated and spatially analyzed using the Global Mapper and ArcGIS software (Breunig et al, 2000;Castanie et al, 2005;Cheremisina and Nikitin, 2006).…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, the 3-D model that we propose already allows analysis of seismicity in 3-D blocks. (Bolt, 1981); 2 Z v, seismic waves velocities, km/s (Pavlenkova, 1996); 3 Z Q, heat flow, mW/m 2 (Lysak et al, 2005); 4 Z r, density, g/cm 3 (Bolt, 1981); 5 Z s, integrated strength of continental lithosphere, MPa (Zacharov, 1996).…”

Section: Computing Deformation Factors In the 3-d Modelmentioning

confidence: 99%

“…Deformation boundaries K 1 , K 2 , and K 4 d discontinuities according to reflection profiling in ASFA (Lind et al, 2004). Physical parameters of crust: 1 Z p, pressure, kbar (Bolt, 1981); 2 Z v, seismic waves velocities, km/s (Pavlenkova, 1996); 3 Z Q, heat flow, mW/m 2 (Lysak et al, 2005); 4 Z r, density, g/cm 3 (Bolt, 1981); 5 Z s, integrated strength of continental lithosphere, MPa (Zacharov, 1996). K 1 e K 4 Z boundaries of earth crust layers.…”

Section: Figurementioning

confidence: 99%

See 3 more Smart Citations

GIS tools for correlation of tectonics and seismicity in the Altay-Sayan area, Russia

Lobatskaya

Krasnoramenskaya²

2010

Geoscience Frontiers

View full text Add to dashboard Cite

Fault-block structures of the Altay-Sayan folded area (ASFA) southeastern Siberia of Russia were used as the basis for creating a 3-D model. The surface structures were projected to depths by previous correlations between long and deep faults, with all layers and deformation factors defined. The mean deformation factor (Ds) is 0.12 unit/km 3 in the upper layer, 0.012 unit/km 3 in the intermediate layer, and 0.007 unit/km 3 in the lower layer of the 3-D ASFA neotectonic model. Ds allows correlation of the three distinguished layers with rheological bodies that differ in their potential for accumulating elastic energy. 3-D modeling can be used as a methodological approach to projections in seismic prone areas such as the Krasnoyarsk region, for earthquake-hazard monitoring. ª

show abstract

Section: Figurementioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Computing Deformation Factors In the 3-d Modelmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

GIS tools for correlation of tectonics and seismicity in the Altay-Sayan area, Russia

Lobatskaya

Krasnoramenskaya²

2010

Geoscience Frontiers

View full text Add to dashboard Cite

show abstract

“…In the absence of long-range refraction data beyond 150 km with Pn details, the present model provides good information of the subcrustal velocity structure in the central Indian shield. Detailed studies of the upper mantle, by explosion seismology, have shown layering with LVL in various tectonic settings such as old Precambrian platforms, young continental platforms and the oceans (FUCHS and VINNIK, 1982;Hirn et al, 1973Hirn et al, , 1975KIND, 1974;ANSORGE, 1975;VINNIK and EGORKIN, 1980;YEGORKIN and PAVLENKOVA, 1981;YEGORKIN et al, 1984;GRAD, 1989;BEAN and JACOB 1990;Benz and McCARTHY, 1994;PAVLENKOVA, 1996 andNEMETH andHAJNAL, 1996). The existence of LVL is often evident in various regions, from the observed seismic record sections, although it is difficult to derive the velocity reduction and thickness of the LVL independently.…”

Section: Discussionmentioning

confidence: 99%

Subcrustal Low Velocity Layers in Central India and their Implications

Murty

Tewari

Kumar

et al. 2005

Pure appl. geophys.

View full text Add to dashboard Cite

A 2-D subcrustal velocity model for the central Indian continental lithosphere has been derived by travel time and relative amplitude modeling of a digitally normalized analog seismic record section of the Hirapur-Mandla DSS profile, using a ray-tracing technique. Some prominent wave groups with apparent velocities slightly higher than the Moho reflection phase (P M P) are identified on the normalized record sections assembled with a reduction velocity of 6 km s )1 . We interpret these phases as the wide-angle reflections from subcrustal lithospheric boundaries. Comparison of synthetic seismograms with the observed record section shows that the observed phases cannot be explained either by multiples or by the P-to-S converted phase (P M S) from the Moho. Subcrustal velocity models either with a velocity increase or with a single low velocity layer (LVL) also do not provide a satisfactory fit. We infer that a subcrustal velocity model with two alternate LVLs (velocity 7.2 km s )1 ), separated by a 6-km thick high velocity layer (velocity 8.1 km s )1 ), can satisfy both the observed travel times and amplitudes. The prominent reflection phases are modeled at depths of 49, 51, 57 and 60 km. It is inferred that the subcrustal lithosphere in the central Indian region has a lamellar structure with varying structural and mechanical properties. The alternating LVLs, occurring at relatively shallow depths below Moho, may be associated with the zones of weakness and lower viscosity suggesting continued mobility, with a possible thermal source in the upper mantle. This explains the source of observed high heat flow values in the central Indian region.

show abstract

Mega‐scale Moho relief and the structure of the lithosphere on the eastern flank of the Viking Graben, offshore southwestern Norway

et al. 2015

View full text Add to dashboard Cite

The International Lithosphere Project deep reflection seismic survey in the Norwegian sector of the North Sea has been reprocessed, particularly focusing on the deep crust, the reflection Moho, and the upper mantle. The data display shifting reflection patterns of the crust and the upper mantle parallel to the eastern margin of the Viking Graben. In the upper crust, which is mainly seismically transparent by the processing techniques utilized here, large-scale structural features like detachment shear zones and master faults can be identified. Several of the major onshore faults and shear zones match seismic features in the seismic lines. Many of these structures acted as extensional shear zones in the Devonian. The middle crust is of variable reflectivity, whereas the lower crust is generally strongly reflective and is particularly so in the southern domain. The reflection Moho is identified throughout the study area but is of variable character. The presence of a S(E) dipping structure (Hardanger Moho Offset) that displaces the Moho by approximately 10 km, extends deep into the mantle (below the 50 km line depth), is positioned where the shallower Hardangerfjord Shear Zone, which flattens on the level of the middle crust, is situated. The Hardangerfjord Shear Zone/Hardanger Moho Offset-system coincides with change of the crustal thickness (depth to Moho), a change that also coincides with the transition from thin-to thick-skinned Caledonian deformation. Intramantle reflections are common in the study area, some of which are interpreted as shear zones, whereas others most likely represent magmatic intrusions.

show abstract

General features of the uppermost mantle stratification from long-range seismic profiles

Cited by 44 publications

References 28 publications

GIS tools for correlation of tectonics and seismicity in the Altay-Sayan area, Russia

GIS tools for correlation of tectonics and seismicity in the Altay-Sayan area, Russia

Subcrustal Low Velocity Layers in Central India and their Implications

Mega‐scale Moho relief and the structure of the lithosphere on the eastern flank of the Viking Graben, offshore southwestern Norway

Contact Info

Product

Resources

About