Crustal structure in Chile and Okhotsk Sea regions

Павленкова, Н. И.; Pilipenko, V. N.; Verpakhovskaya, A. O.; Pavlenkova, G. A.; Filonenko, V.P.

doi:10.1016/j.tecto.2008.08.018

Cited by 14 publications

(2 citation statements)

References 7 publications

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“…Depth ( Barazangi and Brown 1986a,b Barton and White 1997Becker et al 2012Blundell and Raynaud 1986Breivik et al 2003Broucher 1995Bullock and Minshull 2005Chian et al 1995Christeson et al 2008Clegg and England 2003Clowes et al 1999Clowes et al 1987 Pavlenkova et al 2009Prajapati et al 2011Qiu et al 2001Ritzmann et al 2002Roberts et al 1988Rubio et al 2000Sage et al 2000Stankiewicz et al 2008Suckro et al 2012Thréhu et al 1994Tkalcic et al 2011Toomey et al 2007Todd et al 1988Torne et al 2003Vuan et al 2005Wang et al 2004a,b Watremez et al 2011White and McKenzie 1989White and Smith 2009White et al 1987a,b Worthington et al 2012…”

Section: Principal Crustal Typesmentioning

confidence: 99%

Crust and Lithospheric Structure - Global Crustal Structure

Mooney

2015

Treatise on Geophysics

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Section: Principal Crustal Typesmentioning

confidence: 99%

Crust and Lithospheric Structure - Global Crustal Structure

Mooney

2015

Treatise on Geophysics

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“…However, Khain [34] consider that the KB is a back arc basin, in which a suboceanic crust associated with arcrear spreading is assumed. Also, the KB is also assumed as an oceanic basin by others authors [35,65,66], considering principally the crustal thickness of this basin. 5.3.…”

Section: Resultsmentioning

confidence: 99%

3D S-Wave Velocity Model of the Crust and Upper Mantle beneath the Sea of Okhotsk and the Kamchatka Peninsula

Corchete

2022

Lithosphere

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A 3D S-wave velocity model (from 0 to 350 km depth) is determined for the region of the Sea of Okhotsk and the Kamchatka peninsula, through Rayleigh wave analysis applied to the traces of 278 earthquakes registered by 12 seismic stations, both located within (and nearby) of the study area. This model reveals the principal geological and tectonics features present in the study area, e.g., the presence of two lower-crust hot plumes located at the northwest of the Sea of Okhotsk, which are shown as two zones of low S-wave velocity (from 20 to 30 km depth). Also, a conspicuous low S-wave velocity zone is determined at the southwest of the Sea of Okhotsk (from 35 to 60 km depth), which can be matched up with a high conductivity layer previously determined from 30 to 65 km depth. For the Kamchatka peninsula, low S-velocities are determined beneath the volcanic belt from the upper crust (~5 km-depth) down to a depth of ~60 for the southern part, and down to a depth of ~140 km for the northern part. This low S-wave velocity pattern is enlarged in size at the northwest (north of ~55°N), following the location of the Kliuchevskoi and Sheveluch volcanoes, which confirms that these volcanoes must be a part of the same subduction-induced volcanic process. The present model shows that the subducting Pacific slab terminates near to the Aleutian-Kamchatka junction, i.e., no relict slab underlies the extinct northern Kamchatka volcanic arc. This model shows that this slab shoals towards north, and there exists a gap associated with the loss of this slab beneath Sheveluch and Kliuchevskoi volcanoes. The low S-wave velocity pattern determined at northwest of the slab edge confirms the presence of the asthenospheric flow, which would pass through this gap to the northwest around the north slab edge. Finally, the present model shows the precise location and detailed structure of the asthenosphere, which is a new result that has not been determined in other previous studies.

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Accurate measurements of residual topography from the oceanic realm

2014

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In the oceans, our understanding of plate subsidence as a function of age permits residual depth anomalies to be identified and mapped. These anomalies may reflect dynamic topography and could be an important means for constraining convective circulation of the sublithospheric mantle. Here we analyze a global database of seismic reflection and wide‐angle profiles from heavily sedimented oceanic crust, which abuts continental lithosphere. At 449 locations, we calculated water‐loaded subsidence, compared it with a reference age‐depth relationship, and determined residual depth. We then combined these spot measurements of residual depth with observations from mid‐oceanic ridges and from selected ship track bathymetry to construct a global map of residual depth. Our results suggest that the amplitude of residual depth varies by up to ±1 km with wavelengths of order 103 km. We compare our residual depths with free‐air gravity and seismic tomographic anomalies. Our results show that residual depths correlate with long‐wavelength gravity anomalies. In contrast, correlations between residual depths and vertically averaged shear velocity anomalies within the upper and/or the lower mantle are weaker. The largest discrepancies occur at short (∼1000 km) wavelengths. These combined observations suggest that residual depth anomalies could be generate by density variations within a thin (∼102 km) low‐viscosity layer beneath the lithosphere. Our global compilation should play a significant role in helping to refine predictive geodynamical models.

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Crustal structure in Chile and Okhotsk Sea regions

Cited by 14 publications

References 7 publications

Crust and Lithospheric Structure - Global Crustal Structure

Crust and Lithospheric Structure - Global Crustal Structure

3D S-Wave Velocity Model of the Crust and Upper Mantle beneath the Sea of Okhotsk and the Kamchatka Peninsula

Accurate measurements of residual topography from the oceanic realm

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