What is Dahm discontinuity?
What is Dahm discontinuity?
Dahm  and Macelwane [1951, p. 2841 believed that there is a discontinuity at a depth of about 2800 km, and that the velocity decreases there suddenly from 13.24 to 12.57 km/sec, but this has not been confirmed.
Who invented Repetti discontinuity?
His name should be well known to seismologists, for it was as a seismologist that he worked in the Manila Observatory at Padre Faura Street. One of his contributions to that science was the discovery of the existence of what has been called the Repetti Layer of Discontinuity, which helps to explain earthquakes.
When was the Repetti discontinuity discovered?
Repetti (1930) observed a strong change of apparent P velocity at a distance of 33°. He attributed this change to a discontinuity near 970km depth. To reconcile his data with the presently available upper-mantle velocity models, this discontinuity should be placed between 800 and 900km depths.
What is a seismic discontinuity?
When an earthquake occurs the seismic waves (P and S waves) spread out in all directions through the Earth’s interior. Sudden jumps in seismic velocities across a boundary are known as seismic discontinuities.
How deep is the Bullen discontinuity?
The boundary separating these regions is called the Bullen discontinuity. The outer core, about 2,200 kilometers (1,367 miles) thick, is mostly composed of liquid iron and nickel. The NiFe alloy of the outer core is very hot, between 4,500° and 5,500° Celsius (8,132° and 9,932° Fahrenheit).
Where can the Repetti discontinuity be found?
The discontinuity between the upper mantle and the lower mantle is known as Repetti Discontinuity. The portion of the mantle which is just below the lithosphere and asthenosphere, but above the core is called as Mesosphere.
Where can Repetti discontinuity be found?
What is discontinuity in Earth?
Earth’s interior is made of different kinds of materials. Unique layers are there according to their characteristics inside the earth. All those layers are separated from each other through a transition zone. These transition zones are called discontinuities.
Is Mohorovicic a discontinuity?
The Moho is the boundary between the crust and the mantle in the earth. Also termed the Mohorovicic’ discontinuity after the Croatian seismologist Andrija Mohorovicic’ (1857-1936) who discovered it. The boundary is between 25 and 60 km deep beneath the continents and between 5 and 8 km deep beneath the ocean floor.
What is Moho discontinuity and Gutenberg discontinuity?
The Mohorovicic Discontinuity marks the transition zone between the crust and mantle. Gutenberg Discontinuity marks the layer between the lower mantle and the outer core. The Gutenberg Discontinuity is situated at a distance of 2900 kilometres beneath the earth’s surface.
Where is the Bullen discontinuity?
The core is made of two layers: the outer core, which borders the mantle, and the inner core. The boundary separating these regions is called the Bullen discontinuity. The outer core, about 2,200 kilometers (1,367 miles) thick, is mostly composed of liquid iron and nickel.