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The thickness of upper mantle discontinuities (at depths around 410 km and 660 km) provides a critical clue to our understanding of deep earth. Since the amplitude of reflected or S‐P converted waves is controlled by the thickness of discontinuities, short‐period studies of such waves may give a fine constraint on the thickness of upper mantle discontinuities. In this study, we analysed short‐period and vertical waveform data from 14 deep events in the Fiji‐Tonga region. The data were obtained from J‐Array, a short‐period and large‐aperture seismic array in Japan. With slant stack analyses of these data, we detected short‐period reflections or S‐to‐P conversions from 410 km and 660 km discontinuities near sources, which implies that both discontinuities are quite sharp. To directly measure the frequency content of these waves, linear slant stacks were made with various frequency pass‐bands (0.2-0.5, 0.5-1.0 and 1.0-2.0 Hz). Synthetic traces were generated for the models with various thicknesses of the 410 km and the 660 km discontinuities. Comparison of slant stacks with synthetic traces indicates that the thickness of both discontinuities is at most 5 km.
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∙ 13y ago
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∙ 8y agoWiki User
∙ 11y agoIn oceanic areas the upper mantle is usually 5-200km thick and on continental areas it is 75-300km deep.
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∙ 10y agoThe Earth's upper mantle is not uniform in thickness but on average it's about 400 kilometers thick.
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∙ 14y agoit's 410km to 660km thick
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∙ 15y ago670 km
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How thick is the upper mantle in km?
2900 km thick
The thickness of the earths mantle?
The Earth's mantle is about 2,890 km (or 1,800 mi) thick.
Which of the Earth's layers is located just below the mantle?
Upper Mantlemantle
How long is the asthenosphere?
The asthenosphere is a part of the upper mantle of the Earth. It is below the lithosphere and can be over 400 miles thick in areas.
Hot deep is the earths mantle?
Earth's mantle is a rocky shell about 2,890 km (1,800 mi) thick that constitutes about 84 percent of Earth's volume. Two main zones are distinguished in the upper mantle: the inner asthenosphere composed of flowing rock in the state of plasticity, about 200 km thick, and the lowermost part of the lithosphere, composed of rigid rock, about 50 to 120 km thick. A thin crust, the upper part of the lithosphere, surrounds the mantle and is about 5 to 75 km thick. The mantle is divided into sections which are based upon results from seismology. These layers (and their depths) are the following: the upper mantle (starting at the Moho, or base of the crust around 7 to 35 km, downward to 410 km), the transition zone (410-660 km), the lower mantle (660-2891 km), and in the bottom of the latter region there is the anomalous D" layer with a variable thickness (on average ~200 km thick)
How thick is mantle upper?
it's 410km to 660km thick
How thick is the earths upper mantle?
about 20 inches
How thick is Earth's upper mantle?
about 20 inches
The thickness of the lower mantle?
2890 kilometers1,800 miles
What is is the thickness of the upper mantle?
In oceanic areas the upper mantle is usually 5-200km thick and on continental areas it is 75-300km deep.
How thick is the upper mantle in km?
2900 km thick
The thickness of the earths mantle?
The Earth's mantle is about 2,890 km (or 1,800 mi) thick.
What is the Difference between the upper and lower mantle?
Working outwards from the centre: The Earth is believed to be formed of an inner core, outer core, inner mantle, outer mantle, and the crust. The mantle is two thousand miles thick and makes up more than three-quarters of the Earth's volume.
How deep is the earth's upper mantle?
Earth's mantle is a rocky shell about 2,890 km (1,800 mi) thick that constitutes about 84 percent of Earth's volume. Two main zones are distinguished in the upper mantle: the inner asthenosphere composed of flowing rock in the state of plasticity, about 200 km thick, and the lowermost part of the lithosphere, composed of rigid rock, about 50 to 120 km thick. A thin crust, the upper part of the lithosphere, surrounds the mantle and is about 5 to 75 km thick. The mantle is divided into sections which are based upon results from seismology. These layers (and their depths) are the following: the upper mantle (starting at the Moho, or base of the crust around 7 to 35 km, downward to 410 km), the transition zone (410-660 km), the lower mantle (660-2891 km), and in the bottom of the latter region there is the anomalous D" layer with a variable thickness (on average ~200 km thick)
How thick is the earths mantle?
The thickness of the Earth's mantle is about 2900 km and it's upper boundary is about 100km deep. There is a really cool cutaway drawing available by using the Wikipedia link.
How thick is the inner mantle?
the inner mantle of the earth is aproximatly 2850km thick.
Which of the Earth's layers is located just below the mantle?
Upper Mantlemantle
