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Mercator projection of contour map of crustal thickness based on seismic refraction data shown in Fig. 2. The average crustal thickness of oceanic crust is 6–7 km (excluding the 4–5 km of water) and the average thickness of continental crust is about 40 km. [From Mooney, W. D., Laske, G., and Masters, T. G. (1998).
- Upper Mantle
The average upper mantle velocity structure can be...
- Lower Crust
Average room-temperature P-wave velocities for a variety of...
- Continental Crust
This arc contains high-grade metamorphic rocks...
- Oceanic Crust
The average thickness of normal oceanic crust, ... In early...
- Upper Mantle
Jan 14, 2019 · At the same time, the average crustal thickness for the different continental ages is quite similar, ranging from ~36 to 41 km (Figure 4). By comparison, the standard deviation within age categories is more than 6 km. Thus, giving up tectonic regionalization leads only to an acceptable loss of information.
- Wolfgang Szwillus, Juan Carlos Afonso, Jörg Ebbing, Walter D. Mooney
- 92
- 2019
- 14 January 2019
The average thickness of the crust is about 15 - 20 km (9 - 12 mi). [ 6 ] Because both the continental and oceanic crust are less dense than the mantle below, both types of crust "float" on the mantle.
Jan 1, 2018 · The continental crust has an average thickness of around 35 km (Hacker et al. 2015; Huang et al. 2013), considerably thicker than oceanic crust, which averages 6.5 km in thickness (White and Klein 2014). The lower density and greater thickness of the continental crust compared to oceanic crust causes it to ride higher on the mantle; consequently, a large proportion (70% by area) is exposed ...
- rudnick@geol.ucsb.edu
omplexity in plate- tectonic restorationsM apping the thickness of Earth’s crust, on land and in the oceans, allows us to understand fundamental geological and geographical observations, such as the location of m. untain belts and the depth of the oceans. Over the past 10 to 15 years, companies interested in deepwater oil-and-gas exploration ...
The proportions of continental crust, by area, are 69% shield and platform (cratons), 15% old and young orogens, 9% extended (stretched) crust, 6 % magmatic arc, and 1% rifts. The weighted mean continental crustal thickness and average crustal velocity are 41km (SD 6.2km) and 6.45kms−1 (SD 0.21kms−1), respectively.
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These regions have an average crustal thickness of 41.5 km, very close to the weighted global average continental crustal thickness of 41 km. Orogens, young and old, show a wide range of thicknesses, from 30 to 75 km. Extended crust, as the name implies, has been thinned and shows an average thickness of 30.5 km. Rifts, both active and inactive, show a broad range, from 18 to 46 km. Tectonic ...
