Results 211 to 220 of about 2,090 (259)

Mean crustal velocity: a critical parameter for interpreting crustal structure and crustal growth

Earth and Planetary Science Letters, 1981
Abstract Mean crustal velocity is a critical parameter for genesis of continental crystalline crust because it is a function of mean crustal composition and therefore may be used to resolve continental crustal growth in space and time. Although the best values of mean crustal velocity are determined from wide-angle reflection measurements, most ...
Scott B. Smithson, Roy A. Johnson, Yun K. Wong   +2 more
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Crustal structure and temporal velocity change in southern California

pure and applied geophysics, 1975
About twenty blasts are used to determine crustal structure and to monitor temporal seismic velocity changes in southern California. The shot time is determined up to 10 msec by using a disposable pick-up placed directly on the explosive. About 17 permanent stations and 20 temporary stations are used for the recordings.
Kanamori, Hiroo, Hadley, David
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Crustal Velocity Structure of the Dharwar Craton, India

Journal of the Geological Society of India, 2000
Abstract: Re-examination of analog seismic data acquired across Western Dharwar Craton (WDC) and Eastern Dharwar Craton (EDC) (western and middle parts of Kavali-Udipi DSS profile) indicate significant velocity variations in WDC and EDC.
P.R. Reddy, K. Chandrakala, A.R. Sridhar
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Seismic velocities and crustal structure in southern Australia

Journal of the Geological Society of Australia, 1964
Abstract Nuclear explosions in South Australia at Maralinga in 1956 and 1957, and at Emu in 1953, provided unique opportunities for determining accurately seismic velocities in the crust and upper mantle. Stations south and south‐east of Maralinga towards Adelaide gave P velocities of 3.4 km/sec in thin sediments, 5.8 km/sec in the upper 1–2 km of ...
H. A. Doyle, I. B. Everingham
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Crustal Velocity Structure in Central of Iran Using Local Earthquakes

Proceedings, 2012
Earthquakes travel times inversion for determination of velocity structure of crust is one of the most important topics in seismology. In the simultaneous inversion method, the parameters of earthquakes and velocity model are determined initially and are improved during inversion steps.
H. Zamanian, E. Bayramnejad, M. R. Gheitanchi   +2 more
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Seismic velocity structure of crustal intrusions in the Danish Basin

Tectonophysics, 2012
Abstract We image the east- and westward extent of a crustal high-velocity body, the thickness of a layered sequence around the Moho at the flank of the body, and the uppermost mantle velocity along the 320 km long refraction and wide-angle reflection seismic profile ESTRID 2007 in the Danish Basin. Ray-tracing modelling of the seismic data reveals a
Thybo, Hans, Nielsen, Christoffer Alsted
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Tomographic study of crustal velocity structure in southern Finland

Tectonophysics, 1991
Abstract An inverse tomographic problem of the construction of a 3-D velocity structure has been solved for depths of 10, 20, 30, and 40 km using the P-wave arrivals registered by the seismic array in southern Finland and on the DSS lines Sveka (1981) and Baltic (1982).
Yu.A. Burmakov, I.P. Kosminskaya, N.V. Sharov, H. Korhonen, U. Luosto, J. Yliniemi   +5 more
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Crustal structure and velocity anisotropy beneath the Beaufort Sea

Canadian Journal of Earth Sciences, 1981
Crustal-scale seismic refraction data obtained in the Beaufort Sea during 1976 reveal a 4–5 km thick sedimentary layer overlying an oceanic crust that thickens rapidly as it approaches the continental terrace of Alaska. A synthetic seismogram analysis of multiple reflected, water-wave events indicates that the upper sedimentary layer has a ...
J. A. Mair, J. A. Lyons
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Crustal shear velocity structure of the south Indian shield

Journal of Geophysical Research: Solid Earth, 2003
The south Indian shield is a collage of Precambrian terrains gathered around and in part derived from the Archean‐age Dharwar craton. We operated seven broadband seismographs on the shield along a N‐S corridor from Nanded (NND) to Bangalore (BGL) and used data from these to determine the seismic characteristics of this part of the shield.
S. S. Rai, Keith Priestley, K. Suryaprakasam, D. Srinagesh, V. K. Gaur, Z. Du   +5 more
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Crustal structure of seismic velocity in southern tibet and east-westward escape of the crustal material

Science in China Series D: Earth Sciences, 2004
The reflecting events from Moho and other interfaces within the crust are recognized from the wavefield characteristics of P- and S-wave for the 480km long wide-angle seismic profile between Peigu Tso and Pumoyong Tso. Then, seismic crustal structures of P- and S-wave velocities and Poisson ratio under the nearly east-west profile in southern Tibet are
Zhongjie Zhang, Jiwen Teng, Yingkang Li, S. Klemperer, Liqiang Yang   +4 more
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