Earthquake in Japan yesterday may have shifted land 1.3 meters
1–10 of 87 posts
Re: Earthquake in Japan yesterday may have shifted land 1.3 meters
#2The amount of energy released in such events boggles the mind. Shifting cubic-kilometers of rock, in this case several hundred or even thousands of cubic-kilometers, even a few inches requires more energy than all the worlds nukes many times over. We live atop an immense heat engine, every little vibration of which could power our entire civilization for years.
Re: Earthquake in Japan yesterday may have shifted land 1.3 meters
#3Australia updated its latitude and longitude somewhat recently because of continental drift:
> The Geocentric Datum of Australia, the country’s local coordinate system, was last updated in 1994, and Australia is now about 1.5m further north-north-east (or, to give the metric used in a BBC infographic: about the height of a kangaroo).
* https://www.theguardian.com/science/2016/aug/03/mind-the-gap...
* https://www.ga.gov.au/scientific-topics/positioning-navigati...
* https://www.australiangeographic.com.au/topics/science-envir...
To anyone working in the GIS industry: how would one go about doing a 'mass update' of locations of an entire country in maps and firmware and such?
Re: Earthquake in Japan yesterday may have shifted land 1.3 meters
#4This is a very sad example of land movement and it's a tragedy that people have died in the aftermath and recovery effort.
But it's also an important reminder that our super accurate GPS measurements are not 100% reliable over time. The earth moves. Either in jumps like this or fairly constantly if it's somewhere like Australia [0]
0 -https://www.nytimes.com/2016/09/24/world/what-in-the-world/a...
Re: Earthquake in Japan yesterday may have shifted land 1.3 meters
#5How property rights work when land shifts?
Re: Earthquake in Japan yesterday may have shifted land 1.3 meters
#6The amount of energy released in such events boggles the mind. Shifting cubic-kilometers of rock, in this case several hundred or even thousands of cubic-kilometers, even a few inches requires more energy than all the worlds nukes many times over. We live atop an immense heat engine, every little vibration of which could power our entire civilization for years.
It's even harder than harvesting lightnings.
Re: Earthquake in Japan yesterday may have shifted land 1.3 meters
#7This is a very sad example of land movement and it's a tragedy that people have died in the aftermath and recovery effort. But it's also an important reminder that our super accurate GPS measurements are not 100% reliable over time. The earth moves. Either in jumps like this or fairly constantly if it's somewhere like Australia [0] 0 - https://www.nytimes.com/2016/09/24/world/what-in-the-world/a...
I'm confused, how does moving 2.7 inches a year translate into 656 feet over 25 years? Was it moving tens or hundreds of times faster a few decades ago?
Re: Earthquake in Japan yesterday may have shifted land 1.3 meters
#8How property rights work when land shifts?
Land could grow or shrink. I'd think split the difference.
Re: Earthquake in Japan yesterday may have shifted land 1.3 meters
#9Australia updated its latitude and longitude somewhat recently because of continental drift: > The Geocentric Datum of Australia, the country’s local coordinate system, was last updated in 1994, and Australia is now about 1.5m further north-north-east (or, to give the metric used in a BBC infographic: about the height of a kangaroo). * https://www.theguardian.com/science/2016/aug/03/mind-the-gap... * https://www.ga.g…
Locations inside a country (e.g. plat map boundaries) don't use latitude/longitude.
Re: Earthquake in Japan yesterday may have shifted land 1.3 meters
#10The amount of energy released in such events boggles the mind. Shifting cubic-kilometers of rock, in this case several hundred or even thousands of cubic-kilometers, even a few inches requires more energy than all the worlds nukes many times over. We live atop an immense heat engine, every little vibration of which could power our entire civilization for years.
It's even harder than harvesting lightnings.
I'm not sure about that. Drill some holes, pump some water, and geothermal power straight to the grid can be done. Harvesting lighting would require innumerable towers and even would require some trickery to get it hooked up to our power grids.