Australia 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).
I'm also curious if anyone has a good article to read on how this is managed. My guess would be that you have reference points and sets of nearby things that are recorded relative to the closest reference point. As noted in the sibling, your plat map is likely set against a local landmark. (Though, even there, they often also include the lat/lng of where it is expected to be found.)
Australia’s geocentric datum is pretty boring, because Australia’s tectonics are pretty boring. We just don’t get large earthquakes. So the GDA94 → GDA2020 update is actually pretty minor.
If my understanding is correct, the 1.8m difference sometimes talked of between ITRF92 and GDA94 by 2020 is actually irrelevant so long as you do proper projection of your coordinates, which you should, but some things don’t—and so tweaking your reference point from time to time to compensate is pragmatic (in part because it lets people skip deformation models where a metre or so of accuracy is adequate, so temper my “should”). The GDA94 → GDA2020 update is more about certain changes in ITRF1992 → ITRF2014 (~9cm changes in ellipsoidal heights), and local crust deformations. Mass updating from GDA94 to GDA2020 is an easy reprojection.
In saying GDA94 is actually fine as far as continental drift is concerned: the thing most people don’t realise is that all of these coordinate systems are actually time-dependent transformations: they’ve got forecast continental drift baked in. So later datum updates just need to record what actually happened, if it was different enough (which it will be in places).
> Some earthquakes, such as those of the Canterbury earthquake sequence starting in 2010, have caused metres of movement. Where this has happened we have updated the coordinates rather than simply include the movement in the deformation model. This is necessary as otherwise the coordinates will not be accurate enough for many applications. The deformation model still includes the earthquake deformation, but it is applied in reverse to transform coordinates for dates before the earthquake.
The deformation model page <https://www.linz.govt.nz/guidance/geodetic-system/coordinate...> is also rather interesting, giving details of when they’ve released new deformation models, including both forward and reverse patches due to earthquakes, and it’s messy. I haven’t thought too deeply about the reverse patching technique (this isn’t a domain I work in) but I don’t think I like it (though it may be pragmatic) because it messes with epoch-era NZGD2000 points, seems to undermine the purpose of a datum unless you have recorded the coordinate times as well (rather than merely transforming to the epoch, which has now been spoiled). Did have a fun chat with a telecommunications field worker that I happened to meet when I was in New Zealand in 2021, who had a lot of interesting experience after the 2016 Kaikoura earthquake. Lots of stuff I’m not used to thinking about, coming from boring old Australia.
The 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.
I've always found it fascinating that geophysicist and earlier advocate for Bayesian methods, Sir Harold Jeffreys, didn't believe in continental drift and plate tectonics because he felt there was no known source of energy on the Earth massive enough to explain this movement. [0]
He remained an opponent until death (at which point continental drift was widely accepted) which is both a testament to the literally unbelievable energy behind seismic activity and the importance of updating your Bayesian priors as you gain new information.
I think we sort of have the tech to use geological energy, but I imagine the hardest part is not having your equipment destroyed all the time by quakes? You'd probably want to put your collectors deep underground where there's more activity
> Where is the world's greatest known on-land fault movement of any individual earthquake? It's at a place called Pigeon Bush near Wellington New Zealand. It is the surface trace of the Wairarapa Fault. In 1855 a magnitude 8.2 earthquake offset a small stream bed by about 18.5 metres which is the greatest single-event fault movement of any on-land fault in the globe!
> Land within the Refuge that is tidally influenced up to the mean high-tide level, is managed by the Alaska Department of Fish and Game (ADF&G) for its unique recreational and wildlife values. As post-glacial rebound lifts the outer edges of the Refuge beyond the reach of the tides, the Refuge boundary shrinks. --->>> When glacial rebound lifts this new land above the high tide line, landowners adjacent to the Refuge can go through a legal process to claim this new land as a part of their property. <<<--- To ensure that these uplifted lands remain in their natural condition for habitat and recreation, the Southeast Alaska Land Trust (SEALT) sought partnerships with interested landowners through the Accreted Lands Project.
> In areas where the rising of land is seen, it is necessary to define the exact limits of property. In Finland, the "new land" is legally the property of the owner of the water area, not any land owners on the shore. Therefore, if the owner of the land wishes to build a pier over the "new land", they need the permission of the owner of the (former) water area. The landowner of the shore may redeem the new land at market price.
In California, you file an action in court and they will redraw the property lines in a fair manner, allowing everyone affected to have a say in what counts as "fair".
As I understand it (at least in the US), your land rights are based off of relative measurements from a static (to the land) point. They often look like medallions on the ground, anchored in place by fairly sizable stakes to ensure they don't easily move.
The positions of those medallions... not as sure, but I imagine they are in turn positioned according to other static points.
If the land cracks, well, I have no idea. That would be a legal battle no doubt.
EDIT: These fixed points are called "common points" or "points of beginning (POB)", and there's usually one per neighborhood. There are also apparently buried iron rods (survey pins) that define property lines that can be found using a metal detector or such, but they are not foolproof.
4' in Freedom Units. I'm wondering how well utilities and megastructures on the Noto Peninsula are able to cope with gradual and sudden shifts, even in Japan where earthquakes are assumed. It looks like Noto is being ripped and stretched NW from the mainland.
---
Also, I re-read the Fukushima Daiichi report summaries yesterday. It's an almost universal human condition that plays out again and again: corporate risk management for large projects is done improperly, especially when there are constraints and cognitive dissonance imposed by the business culture, and it leads to a major failure.
Points of the failure chain include:
- Failure to account for known unknown risks such as the land subsidence combined with a large tsunami (based on the coastal geomorphology of the specific site).
- Failure to protect critical EDGs from flooding, e.g., seawater intrusion. If trying to run a diesel motor near the ocean, it must be buttoned-up tighter than a Jeep with a snorkel including waterproofing sensors, wiring, and control systems. In general, sites should be chosen on very high ground with a large safety factor. If that's not possible, they should be placed on elevated, reinforced structures.
- GE BWR-3/-4 (Mark I) core design is such that they can overheat and self-destruct, even if scrammed, because cooling is an absolute requirement at all times.
- A lack of redundant, auxiliary, passive cooling ability, such as a gravity-fed reservoir that can be operated manually.
- Regulators did insufficient due-diligence to prevent these risks.
- "Made in Japan" failure of culture (this was part of the final report).
- Using radionuclides that are inherently dangerous and produce forever waste rather than cheaper alternatives like solar with PES. Japan's solar just overtook nuclear, but still relies heavily on coal and gas. BWRs are inherently nastier than PWRs.
Non-problems at FD:
- Scramming worked properly, but the primary loops were still hot.
Disclaimer: Worked in the nuclear industry where hostnames were Simpsons' character names.
This 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]
> our super accurate GPS measurements are not 100% reliable over time
The GPS measurements are 100% reliable. Think of it like getting GPS co-ordinates while on a boat - it's the boat that moves.
A point of interest on land doesn't stay at the same latitude/longitude/altitude because land is a tectonic plate "boat" floating on the mantle.
Close to the earthquake faultplane, land crumples and shears sideways and up/down. Plus secondary effects of the shaking: landslides, settlement, liquifaction.
Finally: I think it helps to remember that earthquakes are fault _planes_. Talk of epicentres and depths and faultlines often misleads our intuitions. For one of the Christchurch earthquakes my parents were about a kilometre away from the faultline (where the faultplane met the surface) and many kilometres away from the epicentre (which is just a synthetic average point), but the faultplane actually was relatively close to them somewhere underneath their home.
Also images of cracks in roads are often extremely misleading. They tend to be spectacular subsidence and are not the faultline. The actual faultline is usually not so photographic and less likely to have great photos early on. Media choses photos for their emotional appeal - not because they are a good approximation for the truth.
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?
> But it's also an important reminder that our super accurate GPS measurements are not 100% reliable over time. The earth moves.
This is IMO an odd statement. Land moves, and we can measure that movement extremely precisely. If software was more competent, we would record positions in four dimensions: space and time, relative to a well defined coordinate system. And we could map a position at one time to a position at another time, with excellent accuracy.
As far as I can tell, the only real limitations are a lack of standards and a lack of software support. I don’t think any common CAD or GIS system has any particular support. Heck, QGIS will happily complain that WGS84 isn’t good for high precision, and I can even tell whether this is a genuinely meaningful statement.
>reminder that our super accurate GPS measurements are not 100% reliable
Lockheed solved this with their super sensitive Magnetic Field 'GPS' device - which they claim if for having 'GPS' accuracy for aircraft and ships nearly 100% based on the localized magnetic signature of the earth - but we all know these are actually built for subterranian/submarine environs where space based GPS no cut it. Can't navigate Agartha without it.
throw0101d|2 years ago
> 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?
taeric|2 years ago
chrismorgan|2 years ago
If my understanding is correct, the 1.8m difference sometimes talked of between ITRF92 and GDA94 by 2020 is actually irrelevant so long as you do proper projection of your coordinates, which you should, but some things don’t—and so tweaking your reference point from time to time to compensate is pragmatic (in part because it lets people skip deformation models where a metre or so of accuracy is adequate, so temper my “should”). The GDA94 → GDA2020 update is more about certain changes in ITRF1992 → ITRF2014 (~9cm changes in ellipsoidal heights), and local crust deformations. Mass updating from GDA94 to GDA2020 is an easy reprojection.
In saying GDA94 is actually fine as far as continental drift is concerned: the thing most people don’t realise is that all of these coordinate systems are actually time-dependent transformations: they’ve got forecast continental drift baked in. So later datum updates just need to record what actually happened, if it was different enough (which it will be in places).
Now real earthquakes—they make things much more interesting. I like what https://www.linz.govt.nz/guidance/geodetic-system/coordinate... says:
> Some earthquakes, such as those of the Canterbury earthquake sequence starting in 2010, have caused metres of movement. Where this has happened we have updated the coordinates rather than simply include the movement in the deformation model. This is necessary as otherwise the coordinates will not be accurate enough for many applications. The deformation model still includes the earthquake deformation, but it is applied in reverse to transform coordinates for dates before the earthquake.
The deformation model page <https://www.linz.govt.nz/guidance/geodetic-system/coordinate...> is also rather interesting, giving details of when they’ve released new deformation models, including both forward and reverse patches due to earthquakes, and it’s messy. I haven’t thought too deeply about the reverse patching technique (this isn’t a domain I work in) but I don’t think I like it (though it may be pragmatic) because it messes with epoch-era NZGD2000 points, seems to undermine the purpose of a datum unless you have recorded the coordinate times as well (rather than merely transforming to the epoch, which has now been spoiled). Did have a fun chat with a telecommunications field worker that I happened to meet when I was in New Zealand in 2021, who had a lot of interesting experience after the 2016 Kaikoura earthquake. Lots of stuff I’m not used to thinking about, coming from boring old Australia.
fragmede|2 years ago
dboreham|2 years ago
sandworm101|2 years ago
IKantRead|2 years ago
He remained an opponent until death (at which point continental drift was widely accepted) which is both a testament to the literally unbelievable energy behind seismic activity and the importance of updating your Bayesian priors as you gain new information.
0. https://en.wikipedia.org/wiki/Harold_Jeffreys#Opposition_to_...
barbariangrunge|2 years ago
cm2187|2 years ago
shagie|2 years ago
> Where is the world's greatest known on-land fault movement of any individual earthquake? It's at a place called Pigeon Bush near Wellington New Zealand. It is the surface trace of the Wairarapa Fault. In 1855 a magnitude 8.2 earthquake offset a small stream bed by about 18.5 metres which is the greatest single-event fault movement of any on-land fault in the globe!
philip1209|2 years ago
shagie|2 years ago
https://storymaps.arcgis.com/stories/662519e4406946faa6e655d...
> Land within the Refuge that is tidally influenced up to the mean high-tide level, is managed by the Alaska Department of Fish and Game (ADF&G) for its unique recreational and wildlife values. As post-glacial rebound lifts the outer edges of the Refuge beyond the reach of the tides, the Refuge boundary shrinks. --->>> When glacial rebound lifts this new land above the high tide line, landowners adjacent to the Refuge can go through a legal process to claim this new land as a part of their property. <<<--- To ensure that these uplifted lands remain in their natural condition for habitat and recreation, the Southeast Alaska Land Trust (SEALT) sought partnerships with interested landowners through the Accreted Lands Project.
And on the wiki page for post-glacial rebound, Finland has an example: https://en.wikipedia.org/wiki/Post-glacial_rebound#Legal_imp...
> In areas where the rising of land is seen, it is necessary to define the exact limits of property. In Finland, the "new land" is legally the property of the owner of the water area, not any land owners on the shore. Therefore, if the owner of the land wishes to build a pier over the "new land", they need the permission of the owner of the (former) water area. The landowner of the shore may redeem the new land at market price.
Kon-Peki|2 years ago
https://law.justia.com/codes/california/2009/ccp/751.50-751....
falcolas|2 years ago
The positions of those medallions... not as sure, but I imagine they are in turn positioned according to other static points.
If the land cracks, well, I have no idea. That would be a legal battle no doubt.
EDIT: These fixed points are called "common points" or "points of beginning (POB)", and there's usually one per neighborhood. There are also apparently buried iron rods (survey pins) that define property lines that can be found using a metal detector or such, but they are not foolproof.
rwmj|2 years ago
intrasight|2 years ago
dang|2 years ago
Magnitude 7.6 earthquake strikes Japan, tsunami warning issued for Ishikawa - https://news.ycombinator.com/item?id=38830281 - Jan 2024 (64 comments)
1letterunixname|2 years ago
---
Also, I re-read the Fukushima Daiichi report summaries yesterday. It's an almost universal human condition that plays out again and again: corporate risk management for large projects is done improperly, especially when there are constraints and cognitive dissonance imposed by the business culture, and it leads to a major failure.
Points of the failure chain include:
- Failure to account for known unknown risks such as the land subsidence combined with a large tsunami (based on the coastal geomorphology of the specific site).
- Failure to protect critical EDGs from flooding, e.g., seawater intrusion. If trying to run a diesel motor near the ocean, it must be buttoned-up tighter than a Jeep with a snorkel including waterproofing sensors, wiring, and control systems. In general, sites should be chosen on very high ground with a large safety factor. If that's not possible, they should be placed on elevated, reinforced structures.
- GE BWR-3/-4 (Mark I) core design is such that they can overheat and self-destruct, even if scrammed, because cooling is an absolute requirement at all times.
- A lack of redundant, auxiliary, passive cooling ability, such as a gravity-fed reservoir that can be operated manually.
- Regulators did insufficient due-diligence to prevent these risks.
- "Made in Japan" failure of culture (this was part of the final report).
- Using radionuclides that are inherently dangerous and produce forever waste rather than cheaper alternatives like solar with PES. Japan's solar just overtook nuclear, but still relies heavily on coal and gas. BWRs are inherently nastier than PWRs.
Non-problems at FD:
- Scramming worked properly, but the primary loops were still hot.
Disclaimer: Worked in the nuclear industry where hostnames were Simpsons' character names.
badcppdev|2 years ago
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...
robocat|2 years ago
The GPS measurements are 100% reliable. Think of it like getting GPS co-ordinates while on a boat - it's the boat that moves.
A point of interest on land doesn't stay at the same latitude/longitude/altitude because land is a tectonic plate "boat" floating on the mantle.
Close to the earthquake faultplane, land crumples and shears sideways and up/down. Plus secondary effects of the shaking: landslides, settlement, liquifaction.
Finally: I think it helps to remember that earthquakes are fault _planes_. Talk of epicentres and depths and faultlines often misleads our intuitions. For one of the Christchurch earthquakes my parents were about a kilometre away from the faultline (where the faultplane met the surface) and many kilometres away from the epicentre (which is just a synthetic average point), but the faultplane actually was relatively close to them somewhere underneath their home.
Also images of cracks in roads are often extremely misleading. They tend to be spectacular subsidence and are not the faultline. The actual faultline is usually not so photographic and less likely to have great photos early on. Media choses photos for their emotional appeal - not because they are a good approximation for the truth.
dataflow|2 years ago
amluto|2 years ago
This is IMO an odd statement. Land moves, and we can measure that movement extremely precisely. If software was more competent, we would record positions in four dimensions: space and time, relative to a well defined coordinate system. And we could map a position at one time to a position at another time, with excellent accuracy.
As far as I can tell, the only real limitations are a lack of standards and a lack of software support. I don’t think any common CAD or GIS system has any particular support. Heck, QGIS will happily complain that WGS84 isn’t good for high precision, and I can even tell whether this is a genuinely meaningful statement.
samstave|2 years ago
Lockheed solved this with their super sensitive Magnetic Field 'GPS' device - which they claim if for having 'GPS' accuracy for aircraft and ships nearly 100% based on the localized magnetic signature of the earth - but we all know these are actually built for subterranian/submarine environs where space based GPS no cut it. Can't navigate Agartha without it.
https://www.gpsworld.com/quantum-magnetometer-senses-its-pla...
I do wonder how much major earthquakes affect the finer signature of the magnetic fields?
londons_explore|2 years ago
Optical flow can easily measure displacements far smaller than 1 pixel over a large area.
baron816|2 years ago
aptitude_moo|2 years ago