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Topic: Mohorovicic discontinuity

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In the News (Fri 20 Apr 18)

  Mohorovicic Discontinuity - The Moho - GEOLOGY.COM
The Mohorovicic Discontinuity, or "Moho", is the boundary between the crust and the mantle.
This surface is known as the Mohorovicic Discontinuity or often simply referred to as the "Moho".
Mohorovicic realized that the velocity of a seismic wave is related to the density of the material that it is moving through.
geology.com /articles/mohorovicic-discontinuity.shtml   (532 words)

 Earthquake Hazards Program: The Men and Women of Seismology: Andrija Mohorovicic
Andrija Mohorovicic was a prominent Croatian scientist in the field of meteorology and seismology at the end of the nineteenth and in the early twentieth century.
In these studies he was the first in the world to establish, on the basis of seismic waves, a surface of velocity discontinuity that separates the crust of the Earth from the mantle and which was named the Mohorovicic Discontinuity in his honour.
Mohorovicic's thoughts and ideas were truly visionary and came to expression many years later (the effects of earthquakes on buildings, harnessing the energy of the bura, models of the Earth, deep-focus earthquakes, hail defence, locating earthquake epicentres, seismographs, etc.).
wwwneic.cr.usgs.gov /neis/seismology/people/mohorovicic.html   (838 words)

 Seismic Evidence for Internal Earth Structure
Mohorovicic (1909) interpreted this to mean that the seismic waves recorded beyond 200 km from the earthquake source had passed through a lower layer with significantly higher seismic velocity.
It is the boundary between the felsic/mafic crust with seismic velocity around 6 km/sec and the denser ultramafic mantle with seismic velocity around 8 km/sec.
The 670 km discontinuity results from the change of spinel structure to the perovskite crystalline structure which remains stable to the base of the mantle.
www.columbia.edu /~vjd1/earth_int.htm   (1141 words)

 Historical Data - IGCP Project 474 - Images of the Earth's Crust & Upper Mantle
Andrija Mohorovicic was born on 23 January 1857 in Volosko, a coastal Istrian village near Opatija, where his father, also named Andrija, was a flsmith making anchors.
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.
Mohorovicic retired at the end of 1921, and died on December 18, 1936.
www.earthscrust.org /earthscrust/science/historic/andriji.html   (894 words)

 Mohorovicic Discontinuity (Moho) | World of Earth Science
The Mohorovicic discontinuity, sometimes referred to as "Moho," is the boundary where Earth's crust meets Earth's upper mantle (approximately 31 mi/50 km below the surface), and where seismic waves travel at a different and more rapid rate than the crust or mantle.
This resistant surface, or discontinuity, allowed Mohorovicic to postulate the existence of a second stratum of material under the crust.
Mohorovicic also noticed from these experiments that the waves, or tremors, traveled at different speeds depending on the thickness of the material inside Earth.
www.bookrags.com /research/mohorovicic-discontinuity-moho-woes-02   (539 words)

 Earth's upper mantle
The coarse layered structure is described by the crust, the mantle and the core.
The nomenclature of the discontinuities follows a proposal by Revenaugh and Jordan 1991b) with the Hales discontinuity H (60 - 90 km), the Gutenberg discontinuity G (50 - 150 km) and the Lehmann discontinuity L (
The discontinuities of the shallow upper mantle and the mantle transition zone are described in the next subsections.
srost.asu.edu /diss_01/node5.html   (824 words)

 Mohorovicic discontinuity   (Site not responding. Last check: 2007-10-18)
The Mohorovi&269;i&263; discontinuity, usually referred to as the Moho, is the boundary between the Earth's crust and the mantle.
The Mohorovi&269;i&263; discontinuity was first identified in 1909 by Andrija Mohorovi&269;i&263; when he observed the abrupt increase in the velocity of earthquake waves at this point.
The location of the Mohorovi&269;i&263; discontinuity varies between about 5 km beneath the mid-oceanic ridges to approximately 75 km beneath continents.
mohorovicic-discontinuity.iqnaut.net   (124 words)

 Geophysics Lab 03
Andrija Mohorovicic's detailed analysis of an earthquake that struck the former Yugoslavia on 10 October 1909 led to his discovery of a significant seismic discontinuity (a 'boundary' across which seismic velocities vary significantly).
This discontinuity was subsequently shown to be a global phenomenon defining Earth's crust-mantle boundary, and in honor of its discoverer, bears his name - the Mohorovicic Discontinuity (or 'Moho').
Mohorovicic's analysis stands as a classical example of a seismic refraction experiment wherein analysis of travel-time vs. distance curves led to discovery of a fundamental aspect of Earth's layered internal structure.
comp.uark.edu /~sboss/geophyxlab04b.htm   (1074 words)

 Andrija Mohorovicic Birthday
By 1901, Mohorovicic had achieved such recognition in the field of meteorology that he was appointed director of the meteorological services for Croatia and Slavonia.
This boundary became known as the Mohorovicic Discontinuity, shortened to the Moho, and it marks the bottom of the earth’s crust.
Mohorovicic continued to make important contributions to seismology into the 1920’s, developing mathematical expressions to describe the travel of seismic waves, and building instruments to record earthquakes.
web.visionlearning.com /events/AMohorovicic_Jan23_2005.htm   (495 words)

 Amateur Geologist Geological Glossary - M
"The boundary surface or sharp seismic-velocity discontinuity that separates the Earth's crust from the subjacent mantle.
The discontinuity probably represents a chemical change from basaltic or simatic materials above to peridotitic or dunitic materials below, rather than a phase change (basalt to eclogite); however, the discontinuity should be defined by seismic velocities alone.
The term moho is an abbreviation for Mohorovicic discontinuity, named for Andrija Mohorovicic, a Croatian seismologist.
www.amateurgeologist.com /content/glossary/glossary_m.html   (2062 words)

 [No title]
Mohorovicic’s father, also named Andrija (or Andrew), was a maker of anchors.
Mohorovicic published a paper in 1909 on the effect of earthquakes on buildings that described periods of oscillation (see lesson 4.3).
In his honor, we call the boundary separating the crust from the mantle the Mohorovicic discontinuity, or the Moho for short.
www.fema.gov /plan/prevent/earthquake/txt/fema-253-unit3a.txt   (8189 words)

 Mohorovičić discontinuity - Wikipedia, the free encyclopedia
The Mohorovičić discontinuity was first identified in 1909 by Andrija Mohorovičić, a Croatian seismologist, when he observed the abrupt increase in the velocity of earthquake waves (specifically P-waves) at this point.
The Mohorovičić Discontinuity is mentioned in one particular computer game, an RTS called "Total Annihilation." Players can build a "Moho Mine" in order to mine metal at or close to the Mohorovičić Discontinuity.
The Mohorovičić Discontinuity is also mentioned in the novel 'Abduction' by Robin Cook, in which a team of scientists are abducted by inhabitants of an underground civilization.
en.wikipedia.org /wiki/Mohorovicic_discontinuity   (318 words)

 Content #1 (Earth layers)
To honor Mohorovicic, scientists have named the boundary between the crust and the mantle the Mohorovicic discontinuity or the "MOHO" for short.
Beno Gutenberg discovered the boundary or discontinuity between the mantle and the outer core.
How did Andrija Mohorovicic discover that the Earth's crust was made of less dense rock than the mantle.
volcano.und.nodak.edu /vwdocs/vwlessons/lessons/Ch1CMB/Content1.html   (356 words)

 AMSOC & Project Mohole
The Mohorovicic Discontinuity marks the boundary between the earth's crust and mantle.
(The Moho was named for Andrija Mohorovicic, a Croatian geologist who first proposed the existence of such a discontinuity.) The plan was to drill to the Moho through the seafloor, at those points where the earth's crust is thinnest.
This relationship proved to be unsatisfactory, and after a series of negotiations and redefined agreements with NSF, the AMSOC Committee in 1964 dissolved itself.
www7.nationalacademies.org /archives/amsoc.html   (591 words)

 Geological Society - Teaching Resources - Crust and Lithosphere   (Site not responding. Last check: 2007-10-18)
The crust (whether continental or oceanic) is the thin layer of distinctive chemical composition overlying the ultramafic upper mantle.
The base of the crust is defined seismologically by the Mohorovicic discontinuity, or Moho.
Oceanic and continental crust are formed by entirely different geological processes: the former is typically 6 - 7 km thick, the latter about 35 - 40 km.
www.geolsoc.org.uk /template.cfm?name=lithosphere   (753 words)

 Notes for Sep 16
A scientist named Mohorovicic noticed that P and S waves arrived at certain recording stations in two sets and at two different times depending on earthquake locations (epicenters).
The discontinuity (change in expected behavior) could be explained by a difference in composition of material (due to the transition from the crust and the underlying layer).
The discontinuity is known as the Mohorovicic discontinuity or Moho.
home.satx.rr.com /bertetti/Sep16notes.html   (641 words)

 Digging a Hole in the Ocean: Project Mohole, 1958-1966
Project Mohole was an attempt to retrieve a sample of material from the earth's mantle by drilling a hole through the earth's crust to the Mohorovicic Discontinuity, or Moho.
In addition, evidence drawn from the Moho could be brought to bear on the question of continental drift, which at the time was still controversial.
Project Mohole was to include three phases, the first consisting of an experimental drilling program, the second consisting of an intermediate vessel program, and the third consisting of the final drilling to the Mohorovicic Discontinuity.
www.nationalacademies.org /history/mohole   (572 words)

An upgoing P wave from a source between the Mohorovicic discontinuity (Moho) and the base of the asthenosphere or any P wave bottoming in the upper mantle not deeper than the base of the asthenosphere
P reflection from outer side of a discontinuity at depth z; z may be a positive numerical value in km.
S reflection from outer side of a discontinuity at depth z; z may be a positive numerical value in km.
www.iris.edu /data/vocab.htm   (1609 words)

 iGEM article: MoHole   (Site not responding. Last check: 2007-10-18)
Mohorovicic may be a hard word to pronounce.
Here is a WAV (sound) file for you; click to hear this Croatian word, the name of the geophysicist who discovered it.
Earth scientists decided to drill through the Earth's crust down to the Mohorovicic discontinuity (where upper mantle begins), and take a sample.
www.ejge.com /iGEM/Articles/MoHole/MoHole.htm   (434 words)

 Volcano Dictionary: M - EnchantedLearning.com
Andrija Mohorovicic (1857 - 1936) was a Yugoslavian geophysicist.
After examining seismic waves from the 1909 Kulpa Valley earthquake, Mohorovicic theorized that a boundary between the Earth's crust and the upper mantle existed (about 50 km beneath the surface) in which the speed of earthquake waves became very rapid.
The Mohorovicic discontinuity separates the crust and the upper mantle of the Earth.
www.zoomschool.com /subjects/volcano/glossary/indexm.shtml   (769 words)

 Oilfield Glossary: Term 'crust'
The crust overlies the more dense rock of the mantle, which consists of rocks composed of minerals like pyroxene and olivine, and the iron and nickel core of the Earth.
The Mohorovicic discontinuity abruptly separates the crust from the mantle; the velocity of compressional waves is significantly higher below the discontinuity.
The crust, mantle and core of the Earth are distinguished from the lithosphere and asthenosphere on the basis of their composition and not their mechanical behavior.
www.glossary.oilfield.slb.com /Display.cfm?Term=crust   (169 words)

 EcoWorld - Earth Articles
The lithosphere is comprised of the crust and upper mantle.
Between the upper mantle and the crust is the seismic discontinuity, called the Moho (Mohorovicic discontinuity), then between the upper and lower mantle a weak zone known as the asthenosphere.
The asthenosphere is a 60 mile thick zone which is partially molten and is what allows for the continental drift.
www.ecoworld.com /earth/ecoworld_earth_home.cfm   (459 words)

 Magnitude The magnitude is a number that characterizes the relative size of an earthquake   (Site not responding. Last check: 2007-10-18)
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.
The boundary is between 25 and 60 km deep beneath the continents and between 5 and 8 km deep beneath the ocean floor.
www.bhrc.gov.ir /Bhrc/d-stgrmo/SHABAKEH/faq/files/Moho.htm   (84 words)

The Mohorovicic discontinuity, sometimes abbreviated to the 'M' discontinuity or the 'Moho', is the boundary between the earth's crust and the mantle.
The Mohorovicic discontinuity was first identified in 1909 by Andrija Mohorovicic by the abrupt increase in the velocity of earthquake waves at this point.
The mantle is the layer located directly under the sima.
phillips.chccs.k12.nc.us /~bbedell/earthlayers.htm   (1624 words)

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