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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.
What else can I help you with?
How thick is the upper mantle in km?
2900 km thick
What is the layer in Earth's mantle between the lithosphere and upper mantle?
lithosphere
Are convection currents found in the upper or lower mantle of earth?
The upper mantle
How thick is the asthenosphere in kilometers?
The asthenosphere is typically around 100-200 kilometers thick beneath the Earth's crust. It is a semi-fluid layer of the upper mantle that allows for the movement of tectonic plates.
Which of the Earth's layers is located just below the mantle?
The layer located just below the mantle is the outer core. It is composed of a liquid layer of iron and nickel that surrounds the solid inner core of the Earth.
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
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
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 lithoshere?
The lithosphere, which includes the crust and upper part of the mantle, is typically around 100 kilometers thick beneath the oceans and up to 200 kilometers thick beneath the continents.
What part of the mantle can flow like thick liquid?
The outer core of the mantle can be liquid.
Is the second layer of the earth the upper mantle or the lower mantle?
upper mantle
What is the Difference between the upper and lower mantle?
The main difference between the upper and lower mantle is their depth within the Earth. The upper mantle is located closer to the Earth's surface, extending from the crust to a depth of about 410-660 km, while the lower mantle lies beneath the upper mantle, extending from around 660-2,891 km deep. Additionally, the upper mantle is more rigid and composed of mainly solid rock, while the lower mantle experiences higher pressures and temperatures, leading to more plastic behavior.
How thick is the upper mantle in the earth Please answer soon I need this for a project that is due on Monday December 8 2008?
This layer is about 163 miles thick below the earth.
The thickness of the lower mantle?
The lower mantle is approximately 2,900 kilometers thick and extends from a depth of around 660 kilometers to 2,900 kilometers beneath the Earth's surface. It is composed mainly of solid rock that exhibits solid-state flow over geological timescales.
