Results 201 to 210 of about 80,375 (242)
PM2.5 Chemical Composition and Geographic Origin of Air Masses in Mabopane, South Africa
X-Ray Spectrometry, EarlyView.ABSTRACT Air pollution is a major global threat to health. The study aimed to analyze the chemical composition of PM2.5 in Mabopane, South Africa, and to identify the contribution of transported particulate pollution sources using backward air transport cluster analysis.
Mandla Bhuda +4 more
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Lake Superior crustal structure
Journal of Geophysical Research, 1966Several analytical techniques have been used to derive crustal structure from the data obtained in the 1963 Lake Superior seismic experiment conducted as a part of the United States and Canadian programs in the Upper Mantle Project. The Lake Superior region was found to have an unusual and rapidly varying crustal structure in comparison with the ...
T. Jefferson Smith +2 more
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Tectonophysics, 1973
There have been eight large-scale refraction experiments in Australia during the last fifteen years. P1 velocities derived from these experiments are significantly higher in the Precambrian shield region than in eastern Australia. Pn-velocities are also higher beneath the shield, and appear to increase systematically from east to west across the ...
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There have been eight large-scale refraction experiments in Australia during the last fifteen years. P1 velocities derived from these experiments are significantly higher in the Precambrian shield region than in eastern Australia. Pn-velocities are also higher beneath the shield, and appear to increase systematically from east to west across the ...
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Venezuela Basin crustal structure
Journal of Geophysical Research: Solid Earth, 1981Velocity‐depth profiles derived from six two‐ship expanding spread experiments, in combination with other geophysical data, define the characteristics of two distinct types of Venezuela Basin crust and the boundary between them. Each two‐ship common midpoint reflection/refraction profile is automatically transformed into the τ‐p plane, ‘picked’ and ...
J. B. Diebold +3 more
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Mean crustal velocity: a critical parameter for interpreting crustal structure and crustal growth
Earth and Planetary Science Letters, 1981Abstract 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 +2 more
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Crustal structure of Central Sicily
Tectonophysics, 2018Abstract We processed crustal seismic profile SIRIPRO, acquired across Central Sicily. To improve the seismic image we utilized the wave equation datuming technique, a process of upward or downward continuation of the wave-field between two arbitrarily shaped surfaces.
Michela Giustiniani +2 more
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Tectonophysics, 1973
Abstract Knowledge of the crustal structure is still fragmentary, despite the stimulus to geophysical work provided by the earthquake of March 28, 1964 (GMT), the underground nuclear explosion LONGSHOT, and the June 1967 series of earthquakes in the Fairbanks area.
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Abstract Knowledge of the crustal structure is still fragmentary, despite the stimulus to geophysical work provided by the earthquake of March 28, 1964 (GMT), the underground nuclear explosion LONGSHOT, and the June 1967 series of earthquakes in the Fairbanks area.
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Journal of Geophysical Research, 1960
A report is given of the results of a seismic field investigation in 1959 of the crustal structure of Iceland. Explosions were made at a depth of 30 meters in Graenavatn, a crater lake in southwest Iceland, and recordings were made with a 12-channel refraction apparatus at a number of stations along two profiles across Iceland, one profile across the ...
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A report is given of the results of a seismic field investigation in 1959 of the crustal structure of Iceland. Explosions were made at a depth of 30 meters in Graenavatn, a crater lake in southwest Iceland, and recordings were made with a 12-channel refraction apparatus at a number of stations along two profiles across Iceland, one profile across the ...
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Crustal structure of Antarctica
Tectonophysics, 1973Abstract Seismic refraction profiles completed in the past twenty years reveal that the top of the basement complex generally lies near sea level in East Antarctica but typically 2 or 3 km below sea level in West Antarctica. Throughout much of East Antarctica the thickness of the layer overlying the basement complex is less than half a kilometer ...
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