What was Andrija Mohorovicic theory?

What was Andrija Mohorovicic theory?

By analyzing data from more observation posts, Mohorovičić concluded that the Earth has several layers above a core. He was the first to establish, based on the evidence from seismic waves, the discontinuity that separates the Earth’s crust from its mantle.

What evidence were used by Mohorovicic to support his theory that there was layering within Earth?

Mohorovicic was surprised to find that some readings reached his instruments faster than he had thought possible. He deduced that some of the seismic waves were traveling through a deeper, denser portion of the Earth, now called the mantle, while slower waves traveled through the crust.

What is called Mohorovicic 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.

How did Mohorovicic discovered Moho?

The Moho is widely believed to be the boundary between Earth’s crust and an underlying layer of denser rocks in Earth’s interior called the mantle. It is named after Croatian seismologist Andrija Mohorovicic, who first detected it in 1909 by examining seismic waves moving through the Earth.

Where is Mohorovicic found?

The Mohorovicic Discontinuity marks the lower limit of Earth’s crust. As stated above, it occurs at an average depth of about 8 kilometers beneath the ocean basins and 32 kilometers beneath continental surfaces. Mohorovicic was able to use his discovery to study thickness variations of the crust.

How fast do P waves travel through granite?


Rock Type Velocity [m/s] Velocity [ft/s]
Dolomite 6,400–7,300 21,000–24,000
Anhydrite 6,100 20,000
Granite 5,800–6,100 19,000–20,000
Gabbro 7,200 23,600

Which layer within Earth is liquid?

The outer core
The outer core is the liquid largely iron layer of the earth that lies below the mantle. Geologists have confirmed that the outer core is liquid due to seismic surveys of Earth’s interior. The outer core is 2,300 km thick and goes down to approximately 3,400 km into the earth.

What is the difference between lithosphere and asthenosphere?

The lithosphere (litho:rock; sphere:layer) is the strong, upper 100 km of the Earth. The lithosphere is the tectonic plate we talk about in plate tectonics. The asthenosphere (a:without; stheno:strength) is the weak and easily deformed layer of the Earth that acts as a “lubricant” for the tectonic plates to slide over.

What is the importance of Mohorovicic discontinuity?

The Mohorovicic discontinuity is important because it marks the boundary between the mantle of liquid magma and the hardened magma that forms the curst.

How did Andrija Mohorovicic support his theory?

From these readings and those of other stations, Mohorovičić observed that certain seismic waves arrived at detecting stations sooner than anticipated, and he deduced that the earthquake was centred in an outer layer of Earth—since called its crust—and that the fast waves had traveled through an inner layer—the mantle.

What is the importance of Mohorovicic Discontinuity?

Which later in the earth does not transmit S waves?

outer core
The outer core does not transmit S–waves and is therefore presumed to be fluid.

What is the Mohorovicic discontinuity?

The Mohorovicic Discontinuity, commonly called the “Moho” is recognized as the boundary zone between Earth’s crust and the mantle. This boundary marks a change in seismic-wave velocity from the crust to the uppermost mantle within the (lithospheric) plate. This boundary was discovered by Andrija Mohorovičić, a Croatian meteorologist-turned

Who is Andrija Mohorovičić?

On January 23, 1857, Croatian meteorologist and seismologist Andrija Mohorovičić was born. He is best known for the eponymous Mohorovičić discontinuity, i.e. he boundary between the Earth’s crust and mantle discovered by him – and is considered a founder of modern seismology.

How did Mohorovicic use his discovery to study the thickness variations?

Mohorovicic was able to use his discovery to study thickness variations of the crust. He discovered that the oceanic crust has a relatively uniform thickness, while continental crust is thickest under mountain ranges and thinner under plains.

What did Moed Mohorovičić do?

Mohorovičić contributed research papers on a variety of other topics in seismology. He evolved a method of determining earthquake epicenters and constructed curves giving the travel times of seismic waves over distances of up to 10,000 miles from the source.