XPost: uk.politics.misc 
 From: anw@cuboid.co.uk 
  
 On 28/10/2019 13:35, Keema's Nan wrote: 
 >>> Do seismographs distinguish between man-made and natural seismic events 
 as 
 >>> they happen? 
 >> If you mean between explosions, nuclear or otherwise, and [eg] 
 >> earthquakes, then yes. Explosions generate primarily P waves, earthquakes 
 >> S waves; these travel at different speeds and propagate differently. 
 [...]> That makes no mention of underwater explosions, and especially not of 
 > explosions which trigger an earthquake of larger energy and immediately 
 > obscures the initial explosion. 
  
  You didn't ask about underwater explosions.  But it doesn't 
 alter the previous response.  From a seismological PoV, it makes v 
 little difference whether an explosion is in [or under] water or in 
 solid rock.  The energy goes into P waves.  If these generate, by 
 whatever means, an earthquake, that will produce primarily S waves, 
 which are slower and certainly won't "obscure" the original P waves. 
 [P and S are usually explained as primary/secondary or as pressure/ 
 shear or seismic waves;  somewhat irreverently they are also known 
 as push and shake waves, which better explains how they arise and 
 propagate.] 
  
 > Are any of those actually going to be about the distinction between 
 > underwater man made and natural seismic events? 
 > I doubt it, so can€€€t be bothered with your dodging any more. 
  
  ???  You asked a question, I answered it.  I've also now 
 answered your follow-up.  I don't expect thanks, but a little 
 politeness goes a long way. 
  
 -- 
 Andy Walker, 
 Nottingham. 
  
 --- SoupGate-Win32 v1.05 
  * Origin: you cannot sedate... all the things you hate (1:229/2)