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   Author  Topic: Where the earthquakes are at...  (Read 815 times)
Ian
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Where the earthquakes are at...
« on: Mar 4th, 2003, 10:07pm »		 Quote Quote  Modify Modify
http://www.iris.edu/seismon/
 
I'm using this page at school at the moment (we're doing a project linking Excel to live data) - it makes for a good interactive wallchart!
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Re: Where the earthquakes are at...
« Reply #1 on: Mar 5th, 2003, 2:06am »		 Quote Quote  Modify Modify
on Mar 4th, 2003, 10:07pm, Ian wrote:
http://www.iris.edu/seismon/
 
I'm using this page at school at the moment (we're doing a project linking Excel to live data) - it makes for a good interactive wallchart!

 
Good site, thanks, Ian. I have NZ's local page bookmarked http://www.geonet.org.nz/latest.html, it reminds me why NZ is called The Shaky Isles.  Cheesy
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Re: Where the earthquakes are at...
« Reply #2 on: Mar 5th, 2003, 9:11am »		 Quote Quote  Modify Modify
Hmmm.....that explains the dain bramage that you Kiwi's suffer Tongue Wink Grin  At least that's what Ian told me. Cheesy
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Re: Where the earthquakes are at...
« Reply #3 on: Mar 5th, 2003, 4:33pm »		 Quote Quote  Modify Modify
Hey, Interesting links, had no idea they're almost a daily thing in your area, some nice pics too. Maxqnz do people in NZ greet each other by asking "Hey dude what's shakin".  Grin. Just kiddin aound. Wink
Regards, DC
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Ian
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Re: Where the earthquakes are at...
« Reply #4 on: Mar 5th, 2003, 10:15pm »		 Quote Quote  Modify Modify
I've a couple of friends who spent a year out in NZ - the first night they were there, there was a five-point-something. They said the most impressive thing about the NZ seismometer network was they could log on and see a live map pinpointing the epicentre (triangulation, I suppose) - it was about 2am and the thing happened 8km away - another thing that impressed them was the way the wooden house construction just flexed a bit and settled back down. They actually went to a house 'lot' ("I'll have model 6 in red with a front porch, when can you deliver?") and got a whole new aspect to the phrase 'moving house'.
 
While he was over there, David organised the 'Big Race' - (about 3 years back now) - sort of a 'Tour de NZ'. He roped in loads of free sponsorship from the radio stations and had them pay for the rest areas too by offering to host some of the new bands at the end of stage/race parties...
« Last Edit: Mar 5th, 2003, 10:16pm by Ian » IP Logged
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Re: Where the earthquakes are at...
« Reply #5 on: Mar 5th, 2003, 10:27pm »		 Quote Quote  Modify Modify
here's what's shaking in my part of the world... only twenty so far today
 
which explains why some folks call it
 
The Late Great State of California
 
Smiley
 
mark
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Re: Where the earthquakes are at...
« Reply #6 on: Mar 5th, 2003, 10:33pm »		 Quote Quote  Modify Modify
There'll be a lot of sensing going on around the San Andreas fault - I expect everyone involved is doing their bit of crystal-ball gazing and trying to work out when the Cali peninsula is going to drift off towards Easter Island...  Wink Bound to be some big surfing event timed to coincide with it Cool
« Last Edit: Mar 5th, 2003, 10:35pm by Ian » IP Logged
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Re: Where the earthquakes are at...
« Reply #7 on: Mar 5th, 2003, 10:41pm »		 Quote Quote  Modify Modify
i've been through more than a few earthquakes here.  everybody talks about and wonders about how an earthquake feels.
 
but few people know about the sound unless they've heard it.
 
i told a friend that it sounds like there is a train in your basement... then the reality hits you that you don't have a basement
 
Smiley
 
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Re: Where the earthquakes are at...
« Reply #8 on: Mar 5th, 2003, 11:09pm »		 Quote Quote  Modify Modify
on Mar 5th, 2003, 10:27pm, mr.mark wrote:
here's what's shaking in my part of the world... only twenty so far today
 
which explains why some folks call it
 
The Late Great State of California
 
Smiley
 
mark

 
 
What' your threshhold for actually noticing a shake, mark? CA gets more 4.5+ than we do, I seem to recall, so when you do actually sytart noticing them? Generally, almost nobody here feels anything smaller than  4.3, is your threshhold higher?
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Re: Where the earthquakes are at...
« Reply #9 on: Mar 5th, 2003, 11:20pm »		 Quote Quote  Modify Modify
Quote:
What' your threshhold for actually noticing a shake, mark?

well there's magnitude then there's proximity to the epicenter, right?
 
if i am within say, 20 miles of an event that is not too deep (too many miles down and it gets tougher to detect), i guess i start feeling the 3's to 4's.  they are almost like suggestions, if you know what i mean.  <g>
 
generally i agree that it takes a mid 4 to be felt by most folks.
 
but then we keep coming back to that epicenter factor.  and if it was out at sea or inland.
 
the ones that make you remember them... those babies are around the 7's.  those drop overpasses and cause ceiling tiles to flap like a deck of cards.
 
too much fun...
 
Smiley
 
mark
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Re: Where the earthquakes are at...
« Reply #10 on: Mar 6th, 2003, 12:26am »		 Quote Quote  Modify Modify
on Mar 5th, 2003, 11:20pm, mr.mark wrote:

well there's magnitude then there's proximity to the epicenter, right?
 
if i am within say, 20 miles of an event that is not too deep (too many miles down and it gets tougher to detect), i guess i start feeling the 3's to 4's.  they are almost like suggestions, if you know what i mean.  <g>
 
generally i agree that it takes a mid 4 to be felt by most folks.
 
but then we keep coming back to that epicenter factor.  and if it was out at sea or inland.
 
the ones that make you remember them... those babies are around the 7's.  those drop overpasses and cause ceiling tiles to flap like a deck of cards.
 
too much fun...
 
Smiley
 
mark

 
I like your "suggestion" idea - thoase sort of quakes that you can say, "nah, just a big passing truck" or whatever.
 
Fortunately, I've never experienced a 7, although we had a spate of close, reasonably shallow 6.5-6.8s in the late '80s and early '90s. That was plenty enough for me, tyvm.  Smiley
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Re: Where the earthquakes are at...
« Reply #11 on: Mar 6th, 2003, 4:09am »		 Quote Quote  Modify Modify
Quote:
Fortunately, I've never experienced a 7

in CA we gets rollers, shakers and jolters.
 
the jolters feel like the bottom momentarily drops out from under you, then it's done.  a real eye-opener.
 
the shakers make houses jump off their foundations, especially the old pier and post foundations.
 
the rollers are the ones that seem to last an eternity.  many years ago, one struck about 2:30am as i recall and lasted all of a minute and a half.  that is one damn long time for the ground to be undulating underneath you!!!
 
during that particular earthquake, i jumped up out of the bed and felt along the wall for the light switch.  i was completely confused, didn't know what was going on, but i just wanted to shed some light on things!  but when i flipped the switch, the electricity was already knocked out.  at about that point my wife calmly (it seemed to me she was calm by comparison) said, "will you get back in bed, we're having an earthquake".  <g>
 
no way was i getting back in bed.  i inched along the wall, everything was rolling, like the floor was a wave, and i peered out the window towards the pasture across the dirt road behind our house.  i'll never forget the sight i saw before me....
 
giant blue, electric spheres, approximately four feet in diameter, kind of pulsating and shimmering, maybe twenty feet off the ground... i remember seeing two or three of them.
 
turns out the power lines were swinging back and forth from all the rolling, and as they came close together, they would arc, and create these surrealistic crackling blue spheres.  the whole effect, with the house moving around and eveything dark outside except for the electric blue arcing, was very eerie.
 
i think we're about due for another one like that.
 
Smiley
 
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maxqnz
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Re: Where the earthquakes are at...
« Reply #12 on: Mar 6th, 2003, 4:24am »		 Quote Quote  Modify Modify
on Mar 6th, 2003, 4:09am, mr.mark wrote:

in CA we gets rollers, shakers and jolters.
 
the jolters feel like the bottom momentarily drops out from under you, then it's done.  a real eye-opener.
 
the shakers make houses jump off their foundations, especially the old pier and post foundations.
 
the rollers are the ones that seem to last an eternity.  many years ago, one struck about 2:30am as i recall and lasted all of a minute and a half.  that is one damn long time for the ground to be undulating underneath you!!!
Smiley
 
mark  
 

 
I have experienced all 3 types you mention, obviously at lesser severity. Like you, I feel certain we are due for another big shake.My town was last destroyed in 1931 by a 7.6 quake, and in the last 150 years, there have been at least 3 quakes estimated to have been between 8.1 and 8.5 in NZ. My grandfather was living in Quetta when it was flattened in 1935, he was involved in the cleanup after that quake, which killed more than 60,000 people.
 
As to the length of a quake, I agree with what you say about how long quakes seem to last. That's why I was horrified to read somewhere that the '08 quake in SanFran apparently lasted for 2.5 minutes - I could not begin to imagine what an 8+ would feel like, let alone one that went on for that long.
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Re: Where the earthquakes are at...
« Reply #13 on: Mar 6th, 2003, 9:38am »		 Quote Quote  Modify Modify
You can have your silly old earthquakes, I will keep my Hurricanes as they don't sneak up on you.  Everybody knows its coming and you can out drive it if you want to.
« Last Edit: Mar 6th, 2003, 9:38am by Jamming » IP Logged
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maxqnz
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Re: Where the earthquakes are at...
« Reply #14 on: Mar 6th, 2003, 11:52am »		 Quote Quote  Modify Modify
on Mar 6th, 2003, 9:38am, Jamming wrote:
You can have your silly old earthquakes, I will keep my Hurricanes as they don't sneak up on you.  Everybody knows its coming and you can out drive it if you want to.

 
Well, where I live, it's almost as likely to be a volcano that does for us. A tip for the unwary - never try to wash volcanic ash off your car. When it mixes with water it becomes very corrosive, as many near here found out the last time we had ashfall.  Grin
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