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Thread: Earth Tremor ripples through Victoria Australia, (Tuesday, 0855HRS June 19th 2012. )

  1. #1 Earth Tremor ripples through Victoria Australia, (Tuesday, 0855HRS June 19th 2012. ) 
    The Enchanter westwind's Avatar
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    Victoria has experienced a moderate Earth Tremor, 5.4 at the Epi-centre. Houses shuddered, windows rattled, hearts fluttered, and westwind, now endoctrinated with some science knowledge, needed a change of underpants. Fortunately no major damage, or injuries. We are only one day away from our Winter Solstice. Is this a co-incidence? I'm going to look up where we are in our Orbit around the Sun, just to see if there has been a Gravitational factor in this Quake. They say, radio interviews, that the slip was about 10 kilometres deep in the Earths crust. Apparently, again from the interviews, this is Victorias biggest quake in 105 years. I'm going up the back directly to see if any of my wild birds have broken their necks, having, while deeply asleep, been shaken from their roosts. westwind.


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    Comet Dust Collector Moderator
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    Yes it is a coincidence.

    http://earthquake.usgs.gov/earthquak...eismicity_1990

    http://www.seismicity.see.uwa.edu.au...tralia#impotEQ


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    The Enchanter westwind's Avatar
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    Thanks MeteorWayne. I owe you an apology, My Time entry was incorrect. adelady will not be impressed. The Time was not 0855HRS. Correct time was 2055HRS. ( 24 hour clock ) 08.55 PM AEST. I
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    Don't feel bad about the time. Trying to advise Austrailian friends on astronomy issues makes my head hurt. Everyone lives in their own time zone, and changes of more than a few time zones (especially crossing the date line) is very intuitively difficult.

    But that's OK, people look at me funny because my talking watch is always set to UTC, so never is the same as Eastern (US) Time.
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    Forum Professor pyoko's Avatar
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    I've been in larger ones in Japan but it was the biggest Melbourne earthquake in around 100 years, so it's significant. Still, we will rebuild.

    John Galt and MeteorWayne like this.
    It is by will alone I set my mind in motion.
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  7. #6  
    Forum Radioactive Isotope sculptor's Avatar
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    I had thought that Australia was one of the old cratons, kinda immune from earth quakes, which i normally ascribe to slip faults.
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    There are a few regions in Australia where seismic activity is quite common, if not producing large quakes.

    If you look at the map here Geoscience Australia — Earthquakes @ GA you'll see one recorded north-east of Hawker in SA's mid North. Basically the southern side of the Flinders Ranges. That area has constant low level recordings of very small earth tremors.
    "Courage is what it takes to stand up and speak; courage is also what it takes to sit down and listen." Winston Churchill
    "nature is like a game of Jenga; you never know which brick you pull out will cause the whole stack to collapse" Lucy Cooke
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    Forum Radioactive Isotope sculptor's Avatar
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    nice map
    right click and it takes you to ayers rock
    what sort of fault creates the quake(s)?
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  10. #9  
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    "Courage is what it takes to stand up and speak; courage is also what it takes to sit down and listen." Winston Churchill
    "nature is like a game of Jenga; you never know which brick you pull out will cause the whole stack to collapse" Lucy Cooke
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  11. #10  
    Forum Radioactive Isotope sculptor's Avatar
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    Fun thing, finding out just how wrong I was in assuming Australia to be a stable old craton. So far(in my reading) it seems that Australia has at least 3 archaean cratons, and an archaean basin, then lots more other(younger)precambrian basins and complexes all smooshed together. With most of the youngest terrains in the south east and east. (where most Aussies live?).
    Long ago, I had read that some of the oldest terrestrial and marine rock were to be found in Australia--now, it seems that they are mostly in western Australia.
    The north american craton which stretches from the mexican border to Greenland tried to split itself apart long ago, splitting off the southwestern most bit of the appalacian mountains. and allowing a vast "inland" sea to fill the void, and then sediment creating our own fertile crescent where the missing mountain bit had been. As the atlantic pushed the continent back together, the old fault(s) remained tenuously held together. The main complex called the new Madrid fault, kicks ass every century or so. and one of it's tendrils called the plumb creek fault runs a couple miles north of our home. It is this fault that led me to seek land higher than the maximum water level in the dammed river that flows just north and east of us. When i first read of the dam, it was described as an earthen dam with a rubble cover. I recently came across an engeneering plan for the dam, and it turns out that the dam has a concrete core, then earthen cover over which is the rubble. So, my concerns that the dam would fail with a minor tremor, seem groundless.
    But, being higher than the high water, has had the advantage of us "looking down" on the 100 and 500 year floods that have happened in the past 20 years.
    Never underestimate the power of dumb luck to see you safely home when planning and intellect fail!
    With you Aussies here, I can see a lot of study about your continent ahead> yippee
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