Andrija mohorovicic biography of mahatma
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This velocity increase indicates a major change in the composition of the rocks at that boundary. Recently the discontinuity between the crust and the mantle on the Mars and the Moon are also referred to as the Mohorovičić discontinuity. After becoming director of the Meteorological Observatory in Zagreb, in 1891, he studied and wrote primarily about clouds, rainstorms, and high winds.
The boundary is now called the Mohorovicic Discontinuity or Moho in honour of the pioneering work of Andrija Mohorovicic.
Andrija Mohorovicic was born on 23 January 1857 in Volosko, a coastal Istrian village near Opatija, where his father, also named Andrija, was a blacksmith making anchors.
The younger Andrija himself loved the sea and he married a captain's daughter, Silvija Verni, and together they had four sons.
Andrija Jr. obtained his elementary education in his home town, continued his study in the gymnasium of a neighboring town, Rijeka, and received his higher education in mathematics and physics at the Faculty of Philosophy in Prague in 1875.
He then enrolled in the department of mathematics and physics at the Faculty of Philosophy of the University of Prague, where he studied in the period of 1875 – 1878. His father, Andrija came from Rukavac in Istria. In these studies he was the first in the world to demonstrate a velocity discontinuity that separates the crustal rocks of the Earth from the deeper mantle rocks.
From 1893 Mohorovičić taught courses in geophysics and astronomy at the Faculty of Philosophy in Zagreb. His mother, Marija nee Poščić was born in Opatija.
In 1922 Andrija Mohorovičić retired. Because it was not possible to have P waves traveling in the same medium at different velocities, and the earlier P arrivals were only seen at some distance from the epicenter, he reasoned that the two different arrival times represented two different phases of P waves traveling different paths.
An accurate clock was particularly important to his research, because in studying earthquakes, an error of one second in the time of arrival means an error of 5.6 km in estimating the length of its travel, making it impossible to accurately locate the focus of an earthquake. And finally, he gradually extended the activities of the observatory to other fields of geophysics: seismology, geomagnetism and gravitation, switching his main interest toward seismology.
Since the P can thus advance (penetrate) only to a depth of 50 km, the boundary of the topmost layer of the Earth's crust is located at this depth. Croatia's first national Provisional Engineering Standards for Construction in Seismic Areas were published in 1964.
During his lifetime, Mohorovicic maintained contacts with seismologists all over the world.
He retired in 1922, but remained active until shortly before his death in 1936. "In the earth's interior, where seismic waves travel invisibly and inaudibly, they can be followed only by mathematical equations."
Dragutin Skoko, Mohorivicic's biographer
The boundary separating Earth's crust from its upper mantle is called the Mohorovicic discontinuity, or the Moho, for short, in honor of the Croatian seismologist Andrija Mohorovicic.
One of his professors was Ernst Mach, the famous physicist. He was meticulous in his daily work.