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Joined: Aug 2000
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Carpal Tunnel
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Carpal Tunnel
Joined: Aug 2000
Posts: 3,409 |
we've had 2 earthquakes in the past 2 months-- both in the 2's (2.5 and 2.9--i think)
2s? Did you feel either of them? Anything less than 4.5 wouldn't even be noticed here, and I know people who have slept through 5s. My Dad was driving around town during our last signifcant shake, 6.4, and when he got home and was asked about the quake, he replied "what quake?"
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Joined: Sep 2000
Posts: 347
enthusiast
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enthusiast
Joined: Sep 2000
Posts: 347 |
>My Dad was driving around town during our last significant shake, 6.4, and when he got home and was asked about the quake, he replied "what quake?"
I had a car like that once too, Max.
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Joined: Sep 2001
Posts: 6,296
Carpal Tunnel
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Carpal Tunnel
Joined: Sep 2001
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I've spent the morning viewing clips of lahar on a site below someone posted above, I think; if not, someone posted the link somewhere in a thread related to lahar. To the point, I searched out some pyroclastic terms that may be of interest to those interested in volcanoes. Many that I found I'll omit in deference to those who won't want an unusually long post: pyroclast-- Volcanology. an individual particle or fragment of clastic rock material of any size that is formed by volcanic explosion or ejected from a volcanic vent.
http://www.harcourt.com/dictionary/def/8/3/1/4/8314100.html
pyroclastic ground surge Volcanology. the comparatively thin layer of rock of varying thickness found around a volcanic vent.
http://www.harcourt.com/dictionary/def/8/3/1/4/8314400.html
pyrogenesis Geology. 1. the intrusion and extrusion of a magma. 2. the products derived from a magma.the products derived from a magma.
http://www.harcourt.com/dictionary/def/8/3/1/5/8315400.html
pyroschist Petrology. a schist or shale with sufficient carbon to burn with a bright flame or to yield volatile hydrocarbons upon heating.
http://www.harcourt.com/dictionary/def/8/3/1/8/8318600.html
...now if I could just relocate the site that had the eerie photographs of pillow lava...
Oh, and here's the site that has the footage of lahar in action:
http://www.geo.mtu.edu/volcanoes/pinatubo/lahar/
WW
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Joined: Nov 2000
Posts: 3,439
Carpal Tunnel
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Carpal Tunnel
Joined: Nov 2000
Posts: 3,439 |
Volcanoes give us aa and pahoehoe
Two Hawaiian words. a'a is pronounced "ah-ah" and pahoehoe is Pah-HOY-hoy ... just in case anyone cares!
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Joined: Nov 2000
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old hand
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old hand
Joined: Nov 2000
Posts: 866 |
a'a allegedly got its name from the sound made when the Hawaiins walked barefoot across an a'a flow. I kid you not.
stales
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old hand
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old hand
Joined: Nov 2000
Posts: 866 |
wwh - there you go - right there - in the subject of this post....
We British Commonwealthers say 'geological'.
This spelling would make sense to Mr Spock (follow me on this one.........)
stales
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old hand
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old hand
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A couple of my favourites relate to glacial deposits.
Picture if you will, a glacier slowly melting - dumping its load of boulders and bits of rock all along its path, not just at its end (for the geologically inclined - not at its 'terminal morraine'). Occassionally a large boulder will drop where no other large boulders are to be found. Once the glacier has melted one is left with a flat terrain with large boulders scattered here and there. Perhaps the most common technical term used for these is "erratic blocks".
Unfortunately Dr Robin Wass at Sydney Uni in 1978 ruined my geological and political correctness for all time. His pet term was the spooneristic, "erotic blacks". Ever since, I've really had to concentrate in order to use the correct term.
Another term for these isolated boulders (some the size of a house) is "knockers".
Once, when attending a presentation on the geology of Greenland (where knockers are a regular feature), I couldn't help myself. Just had to put up my hand and ask of the presenter, "Dr Ridley - could you comment upon whether there is any cleavage associated with those knockers?"
A rock unit's cleavage (as opposed to a crystal's cleavage) is an important component that assists geologists establish the structural history of the area).
stales
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Joined: Apr 2000
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Carpal Tunnel
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Carpal Tunnel
Joined: Apr 2000
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Stales, don't leave us hanging over your cleavage. What was Dr. Ridley's reply?
Bingley
Bingley
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Carpal Tunnel
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Carpal Tunnel
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you could almost feel it.
Anything less than 4.5 wouldn't even be noticed here
Whether one notices an earthquake depends not only on the Richter Scale level but also on the nature of the ground through which the shock waves are travelling. Earthquakes felt through the suspension of an automobile can be mistaken for shock waves from passing trucks.
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Joined: Sep 2001
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Carpal Tunnel
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Carpal Tunnel
Joined: Sep 2001
Posts: 6,296 |
Stales...You wrote:
A rock unit's cleavage (as opposed to a crystal's cleavage) is an important component that assists geologists establish the structural history of the area).
Crytal's cleavage isn't important to geologists?
And, on geologic and Dr. Spock: Would he prefer biologic, psychologic, anthropologic, and gang?
DubDub
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