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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. The project was suggested in March 1957 by Walter Munk, NAS member (1956) and member of the National Science Foundation (NSF) Earth Science Panel.
Project Mohole represented, as one historian has described it, the earth sciences' answer to the space program. If successful, this highly ambitious exploration of the intraterrestrial frontier would provide invaluable information on the earth's age, makeup, and internal processes. 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.
How Was the Moho Discovered?
The Mohorovicic Discontinuity was discovered in 1909 by Andrija Mohorovicic , a Croatian seismologist. Mohorovicic realized that the velocity of a seismic wave is related to the density of the material that it is moving through. He interpreted the acceleration of seismic waves observed within Earth's outer shell as a compositional change within the earth. The acceleration must be caused by a higher density material being present at depth.
The lower density material immediately beneath the surface is now commonly referred to as "Earth's crust". The higher density below the crust became known as "Earth's mantle". Through careful density calculations Mohorovicic determined that the basaltic oceanic crust and the granitic continental crust are underlain by a material which has a density similar to an olivine-rich rock such as peridotite.
Originally posted by loam
I heard something similar last night and the deeper rumble about a week or two ago in the DC area. I have no clue what this could be.
Originally posted by Louise6
Do you think it could be Fracking?
< Hi Im new by the way >
Originally posted by StealthyKat
I wish people would stop opening new threads when there are so MANY on this topic. It's getting to be very hard to keep up with........ S E A R C H
Originally posted by Corruption Exposed
reply to post by Stormdancer777
It does sound mechanical, almost like a large factory, no idea what kind though.
What ever it is, it sounds huge.