Detection of waves converted from P to SV in the mantle

Vinnik, Lev

doi:10.1016/0031-9201(77)90008-5

Cited by 690 publications

(452 citation statements)

References 2 publications

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“…The receiver function technique is a well-established seismological technique that permits extraction of information about the lithospheric structure from the analysis of converted seismic waves at seismic discontinuities (e.g. Vinnik 1977;Langston 1979;Ammon 1991;Zhu & Kanamori 2000). We focus above all on the interpretation of P-to S-wave conversions at the Moho interface (Pms) beneath the stations.…”

Section: Introductionmentioning

confidence: 99%

Crustal thickness and images of the lithospheric discontinuities in the Gibraltar arc and surrounding areas

Mancilla

Stich

Morales

et al. 2015

Geophysical Journal International

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S U M M A R YThe Gibraltar arc and surrounding areas are a complex tectonic region and its tectonic evolution since Miocene is still under debate. Knowledge of its lithospheric structure will help to understand the mechanisms that produced extension and westward motion of the Alboran domain, simultaneously with NW-SE compression driven by Africa-Europe plates convergence. We perform a P-wave receiver function analysis in which we analyse new data recorded at 83 permanent and temporary seismic broad-band stations located in the South of the Iberian peninsula. These data are stacked and combined with data from a previous study in northern Morocco to build maps of thickness and average v P /v S ratio for the crust, and cross-sections to image the lithospheric discontinuities beneath the Gibraltar arc, the Betic and Rif Ranges and their Iberian and Moroccan forelands. Crustal thickness values show strong lateral variations in the southern Iberia peninsula, ranging from ∼19 to ∼46 km. The Variscan foreland is characterized by a relatively flat Moho at ∼31 km depth, and an average v P /v S ratio of ∼1.72, similar to other Variscan terranes, which may indicate that part of the lower crustal orogenic root was lost. The thickest crust is found at the contact between the Alboran domain and the External Zones of the Betic Range, while crustal thinning is observed southeastern Iberia (down to 19 km) and in the Guadalquivir basin where the thinning at the Iberian paleomargin could be still preserved. In the cross-sections, we see a strong change between the eastern Betics, where the Iberian crust underthrusts and couples to the Alboran crust, and the western Betics, where the underthrusting Iberian crust becomes partially delaminated and enters into the mantle. The structures largely mirror those on the Moroccan side where a similar detachment was observed in northern Morocco. We attribute a relatively shallow strong negativepolarity discontinuity to the lithosphere-asthenosphere boundary. This means relatively thin lithosphere ranging from ∼50 km thickness in southeastern Iberia and northeastern Morocco to ∼90-100 km beneath the western Betics and the Rif, with abrupt changes of ∼30 km under the central Betics and northern Morocco. Our observations support a geodynamic scenario where in western Betics oceanic subduction has developed into ongoing continental subduction/delamination while in eastern Betics this process is inactive.

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Section: Introductionmentioning

confidence: 99%

Crustal thickness and images of the lithospheric discontinuities in the Gibraltar arc and surrounding areas

Mancilla

Stich

Morales

et al. 2015

Geophysical Journal International

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“…Langston 1977;Vinnik 1977). Thanks to the deconvolution procedure, source time function, ray−path influence and instrument transfer function should be removed from horizontal components of seismograms, resulting in function which contains only an impulse response of the structure be− neath a seismic station.…”

Section: Methodsmentioning

confidence: 99%

Crustal and upper mantle seismic structure of the Svalbard Archipelago from the receiver function analysis

Wilde−Piórko¹

2015

Polish Polar Research

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Abstract:Receiver function provides the signature of sharp seismic discontinuities and the information about the shear wave (S−wave) velocity distribution beneath the seismic sta− tion. This information is very valuable in areas where any or few reflection and/or refraction studies are available and global and/or regional models give only rough information about the seismic velocities. The data recorded by broadband seismic stations have been analysed to investigate the crustal and upper mantle structure of the Svalbard Archipelago. Svalbard Archipelago is a group of islands located in Arctic, at the north−western part of the Barents Sea continental platform, which is bordered to the west and to the north by passive continen− tal margins. The new procedure of parameterization and selection of receiver functions (RFs) has been proposed. The back−azimuthal sections of RF show a strong variation for the HSPB and KBS stations. Significant amplitudes of transversal component of RF (T−RF) for the HSPB station indicate a shallow dipping layer towards the southwest. The structure of the crust beneath the SPITS array seems to be less heterogeneous, with very low amplitudes of converted phase comparing to the KBS and HSPB stations. Forward modelling by trial−and−error method shows a division of the crust into 3-4 layers beneath all stations and layering of the uppermost mantle beneath the SPITS array and the HSPB stations. The thickness of the mantle transition zone is larger for western part of archipelago and smaller for eastern part comparing to iasp91 model.

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“…For investigation of deep structure we have applied the method of PS converted waves, generated by distant earthquakes (ANDREEV, 1957;COOK et al, 1962;BULIN, 1971;POLSHKOV et al, 1973;POMERANCEVA and MOZZENKO, 1977;VINNIK, 1977;VINNIK et al, 1983;BURDICK and LANGSTON, 1977;SHAO and ZHANG, 1978;OKADA, 1979). the SH components of PS waves will appear besides SV components (EGORKINA, 1975).…”

Section: Methods Of Investigation and Interpretation Of Datamentioning

confidence: 99%

The Common Features of Deep Structures in Some Large-Earthquake Areas of the North China Plain and Their Implication for Earthquake Site Prediction

et al. 1986

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This work deals with the deep structure of the earth's crust and the uppermost mantle as revealed by a method using P-SV converted waves from earthquakes in Beijing-TianjinTangshan and some large-earthquake areas of the North China Plain. During the last ten years a series of seismic profiles have been completed in the studied region with a total length of about 2,000 km. The comparison of deep structure with the distribution of earthquakes indicates that most strong earthquakes are located at the boundary of faultblocks and especially at the intersection of deep-seated fault zones where the depth of deep boundaries changes discontinuously. Some common features of the deep structure have been revealed in Tangshan and other large-earthquake areas of the North China Plain. These include shallow crystalline basement, deep Moho discontinuity, thick crystalline crust, and intersection of deep-seated faults with different trends. By way of structural comparison, some areas with deep structures similar to those of large-earthquake areas have been established in the northern part of the North China Plain, which could be considered the areas with potential risk for strong earthquakes.

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Detection of waves converted from P to SV in the mantle

Cited by 690 publications

References 2 publications

Crustal thickness and images of the lithospheric discontinuities in the Gibraltar arc and surrounding areas

Crustal thickness and images of the lithospheric discontinuities in the Gibraltar arc and surrounding areas

Crustal and upper mantle seismic structure of the Svalbard Archipelago from the receiver function analysis

The Common Features of Deep Structures in Some Large-Earthquake Areas of the North China Plain and Their Implication for Earthquake Site Prediction

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