180 dB at 100 miles distant from the eruption, according to Wikipedia. :eek:

http://en.wikipedia.org/wiki/Krakatoa


How did any of the residents of Jakarta (about 100 miles from Krakatoa) escape being permanently deafened by the eruption?

They must have used an "Old School" SPL meter to measure it back in the 1800's :D

Stopped at a traffic light in North Las Vegas yesterday, the lowrider in the lane next to me came pretty damned close to those kind of levels.

haha!

I was curious about the power requirements of reproducing 180 dB. An efficient speaker might be capable of producing 100 dB at 1 meter with 1 watt of input. Here it is on paper - it gets insane pretty quick... :)

100 dB - 1 watt

110 dB - 10 watts

120 db - 100 watts

130 dB - 1,000 watts

140 dB - 10,000 watts

150 dB - 100,000 watts

160 dB - 1,000,000 watts

170 dB - 10,000,000 watts

180 dB - 100,000,000 watts


Now THAT's power.

I can't help but wonder how that spl estimate was developed. There was no such thing as an spl meter back then.

I can't help but wonder how that spl estimate was developed. There was no such thing as an spl meter back then.
I think that this was an energy estimated of the shockwave that would have been produced by blowing so much mass into the atmosphere all at once.

Anyway, I think that this figure may be of date. More recent studies have pointed to the fact that the Yellowstone caldera is the Largest volcano on the planet, and that its eruptions have been estimated to be something like 100 times larger than was Krakatoa. Krakatoa was simply the largest in recorded history (although Crater lake was a pretty huge blow too). :eek:

Yeah, and according to that program they show on the History channel/Dicovery/Science about every 3rd day, it could go again any time..or not for another 50-100 000 years...

The last time Yellowstone went off, the effects were felt in what is now Chicago, scarey huh? The New Madrid fault in southern MO. made the mississippi river run backwards and rang church bells in Boston, probably a 9.5 easy! Ya'll in Memphis are safe , soild rock underneath, every one form Minn. St. Louis, KC, Dallas, Little Rock, hell even Denver take cover!!!

The last time Yellowstone went off, the effects were felt in what is now Chicago, scarey huh? The New Madrid fault in southern MO. made the mississippi river run backwards and rang church bells in Boston, probably a 9.5 easy! Ya'll in Memphis are safe , soild rock underneath, every one form Minn. St. Louis, KC, Dallas, Little Rock, hell even Denver take cover!!!
FWIW - The New Madrid Fault and Yellowstone are pretty much unrelated. The new madrid quake was extremely bad, no question about it. However if these scientists are to be believed, then Yellowstone eruptions constitute potentially extinction level events... They say that within a 600 mile raduis that the depth of the ash would be measured in feet! :eek:

But fortunately Yellowstone eruptions happen at something like 600,000 year intervals, so the odds of anything like this happening in our lifetimes is extremely slim. :yes:

I wonder if that energy is mostly infrasonic? - flaps your pants legs and pops your eardrums, but not really loud? Or was it a sharp bang at that distance?

There was a meteor that exploded over Siberia or some other remote area of Russia. The explosion flattened 100 square miles of forest and the sound was heard 600 miles away. Sorry,no 100 ft Tidal wave like Krakatoa though.

I just visited Meteor Crater in Arizona and in their museum they had info on this Russian meteor. Pretty impressive stuff.

180 dB at 100 miles distant from the eruption, according to Wikipedia. :eek:

http://en.wikipedia.org/wiki/Krakatoa


How did any of the residents of Jakarta (about 100 miles from Krakatoa) escape being permanently deafened by the eruption?


many suffered serious hearing problem after that event I guess.. : :sigh:

I wonder if that energy is mostly infrasonic? - flaps your pants legs and pops your eardrums, but not really loud? Or was it a sharp bang at that distance?

According to what I've read - the volcano produced sounds that were all over the audible (and inaudible) spectrum - infrasonics to ultrasonics and everything in-between.

180 dB at 100 miles distant from the eruption...

Yes, but only in the Telarc version.

Ya'll in Memphis are safe , soild rock underneath...

LOL! Now that's a good joke. Memphis (especially downtown) rests on predominantly loess bluffs, not rock. It may excavate like rock, but it collapses like flour. Just another fluvial/alluvial shit soil, my good man. Shifts in crust have always happened and always will. The key is to learn to "ride the waves".

:smoke:

I had a friend who's ex-wife went to nursing school in Memphis, they have earthquakes there all the time. He said the first several times it happens, its just a TAD disconcerting, but you eventually get used to it, like all the other natives.

Yes, but only in the Telarc version.

Haha, could you imagine if it were possible for Telarc to go back in time, and record the eruption noise digitally, a sound that's easily 40-50 dB louder than the cannons on Telarc's "1812 Overture" cd? Everyone who attempted to play it at "reference level" would be picking up the remains of their destroyed woofers from the floor.

Telarc wouldn't just need warning labels on the sleeve - they'd need liability insurance. :D

When the BIG ONE hits New Madrid, Memphis will most likely be leveled. Memphis has become too comfortible with the New Madrid Fault. Most of the houses are wood frame,and most of the buildings are made of brick and mortar. Downtown has mostly old brick buildings. The New Autozone building is built to earthquake standards. I live an hour south of Memphis and am well aware of the wide spread devistation that will result when a magnitude 7 quake hits New Madrid MO.

Harry

LOL! Now that's a good joke. Memphis (especially downtown) rests on predominantly loess bluffs, not rock. It may excavate like rock, but it collapses like flour. Just another fluvial/alluvial shit soil, my good man. Shifts in crust have always happened and always will. The key is to learn to "ride the waves".

:smoke:
Hey cruisaire,
Sorry dude, I hate to give out misinformation, thanks for setting me straight! Hope the :smoke: was for my boy, what's he thinkin' throw'n his fat ass into the crowd?!! Wish I had been there!! Yehaa, Yellowstone has been rising alot in the past several years. National Geo folks are over the place. certain areas are closed because the geysers are acting funny. If it happens it happens just hope I'm listening to Dolly Parton singing After The Gold Rush when it does!! Peace Craig :music: :thmbsp: GO :smoke:

Yo Craig!

No sweat Bro, just imagine what it would be like if it hit during the BBQ competition in May!!!! Loud music and hot 'cue, they might not even feel it!

Later
:D

According to a park infomation sign posted near Yellowstone Lake, the last time it blew up, chucks ended up in Texas & California!

Yeah, at field camp years ago I dug up a 12 lb. volcanic bomb (obsidian) from Swan Valley, ID. Pretty sure it came from Jellystone. That ain't as far as Texas but a nice "toss" anyway.