What did Andrija Mohorovicic do?
Andrija Mohorovicic (1857-1936) was a pioneer of the developing science of seismology in the early twentieth century, whose close observations of seismic waves gave us the concept of the Earth’s mantle. The Mohorovicic Discontinuity, named in his honor, is the boundary between the Earth’s crust and the mantle.
What is meant by Mohorovicic Discontinuity?
The Moho is the boundary between the crust and the mantle in the earth. This is a depth where seismic waves change velocity and there is also a change in chemical composition. Also termed the Mohorovicic’ discontinuity after the Croatian seismologist Andrija Mohorovicic’ (1857-1936) who discovered it.
How did Andrija Mohorovicic discover a boundary change in the Earth’s layers?
it is noted that Mohorovicic discovered the crust-mantle boundary by noting a change in speed of the seismic waves. Specifically, as one crosses the boundary the predominant mineral composition of the rock changes, and the minerals on the mantle side enable seismic waves to travel faster.
How did Andrija Mohorovicic discovered that the Earth’s crust is made of less dense rock than the mantle?
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 are the contributions of Andrija Mohorovicic to geophysics?
Mohorovicic’s major contribution for which he is famous is the discovery of the discontinuity between the mantle and the crust. In 1909 a major earthquake in Croatia provided Mohorovicic with empirical evidence that he used to discover the division between the crust and the mantle, as well as the mantel and the core.
Who is the Croatian geophysics?
Andrija Mohorovičić
Andrija Mohorovičić (23 January 1857 – 18 December 1936) was a Croatian geophysicist. He is best known for the eponymous Mohorovičić discontinuity and is considered one of the founders of modern seismology….External links.
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How do you pronounce Andrija Mohorovicic?
Phonetic spelling of andrija mohorovicic
- and-dree-ha mo-ho-ro-vi-check.
- an-drija mo-horovi-cic.
- andrija mohorovicic. August Metz.
How did Mohorovičić discovered Moho?
History. Croatian seismologist Andrija Mohorovičić is credited with first discovering and defining the Moho. In 1909, he was examining data from a local earthquake in Zagreb when he observed two distinct sets of P-waves and S-waves propagating out from the focus of the earthquake.
Who discovered discontinuities?
The Mohorovičić discontinuity was first identified in 1909 by Mohorovičić, when he observed that seismograms from shallow-focus earthquakes had two sets of P-waves and S-waves, one set that followed a direct path near the Earth’s surface and the other refracted by a high-velocity medium.
How fast do P waves travel through granite?
For instance, the p-wave velocity of shale can range from 800-3,700 m/s. Granite can range from 4,800-6,700 m/s.
What is Mohorovičić discontinuity and Gutenberg discontinuity?
Mohorovicic Discontinuity: This is the transition zone between the crust and the mantle. Repetti Discontinuity: This separates the upper mantle from the lower mantle. Gutenberg Discontinuity: This is the transition zone between the lower mantle and the outer core.
Who invented the Geophysics?
In circa 240 BC, Eratosthenes of Cyrene deduced that the Earth was round and measured the circumference of Earth with great precision. He developed a system of latitude and longitude. Perhaps the earliest contribution to seismology was the invention of a seismoscope by the prolific inventor Zhang Heng in 132 AD.
What is the Mohorovičić discontinuity?
To one of Mohorovičić’s biggest contributions to science belogs the famous Mohorovičić Discontinuity, which was discovered around 1910 and it can be described as the boundary between the Earth’s crust and the mantle .
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.
What is the Moho discontinuity?
Among scientists studying seismology the famous Moho layer (or Moho discontinuity) of the Earth is well known. It was named after the great Croatian geophysicist Andrija Mohorovicic (born in Volosko, 1857-1936), professor at the University of Zagreb.
Who is Stjepan Mohorovičić?
Mohorovičić is the father of physicist and geophysicist Stjepan Mohorovičić (1890-1980), physics teacher at a school in Zagreb, still remembered today for predicting the existence of positronium in 1934 (in Astronomical News ).