Every morning I stand on my front porch and wave a stalk of celery to keep elephants away. How do I know it works? Because I don't see any elephants in my yard.
If you're planning to go hiking or Bigfooting in Helens sometime in the next couple of weeks, we suggest you stay away from locations where these 70 something passive seismic stations are located.
The passive sensors are where the vibrations from the explosions are detected, not where the explosives are placed. Duh! That's a place where it will take very sensitive instruments to detect any vibrations... unless the author is saying that's where all the biggest will congregate for safety from the explosions.
“The passive sensors are where the vibrations from the explosions are detected, not where the explosives are placed. Duh! ......”
I have to ask. If anyone is doing explosions up there would they not forbid any hikers from entering? Or is that just me? Then again there are some tree huggers who would go out anyway, I guess.