3 ms·
Not such a great thing if you're doing ambient noise seismology, though! You win some, you lose some... (For background, you can also use the noise from truck
by jofer 7y ago
Not such a great thing if you're doing ambient noise seismology, though! You win some, you lose some...
(For background, you can also use the noise from trucks/etc as a seismic source to probe the structure of the subsurface. It's much more computationally intensive and, well, noisy, but it actually works!)
- TheGallopedHigh 7y agoThat’s quite interesting. It would be great if you explain a bit more about it. Namely, this is only used for locations close roads? Can other natural occurrences of sound give the same result? Can the same source that’s moving give a better picture of what’s below by that fact that it’s moving? Ie setup at different locations, so to speak.
- jofer 7y agoSorry I never noticed this! More or less any source of noise that's loud enough and is coupled to the ground works. In fact, a lot of what winds up being a good source is actually things like ocean waves -- not just man-made noise. Ideally, you want a clear "spike" of noise at a lot of locations and not necessarily a moving source. However, something like a truck/train hitting bumps at different locations along the road could definitely do a nice job of that. At any rate, the basic idea is to look at cross correlations of the waveforms -- any noise that is clearly correlative at different seismic stations is used. Take all of this with a grain of salt -- I work in an adjacent field and not exactly this one.