4 ms·
How do these detect tsunamis? They must be observing elevation changes, right? Is that GPS based?
by pageandrew 2y ago
How do these detect tsunamis? They must be observing elevation changes, right? Is that GPS based?
- whimsicalism 2y agoi think they monitor pressure waves somehow here is an interactive map, looks like some of them are picking up something https://www.ndbc.noaa.gov/obs.shtml?lat=13&lon=-173&zoom=2&pgm=tsunami https://www.ndbc.noaa.gov/obs.shtml?lat=13&lon=-173&zoom=2&p...
- hinkley 2y agoTriangulation can tell you where a point is between three sources but you need four to determine elevation, because it’s not the radius of a circle but the radius of a sphere. But at sea there’s not much to obscure satellite signals so I believe resolving buoy position was a solved problem back when gps car navigation still sucked balls because tall buildings make everything harder. You need a lot more satellites to see three or four at the same moment.