Notes for Mt St Helens Feb 2012 Archive


The big signal on 046 (15th February) is the Mag 6.0 + Mag 5.9 within 1 second of each other off the coast of Oregon. Read more about this here.

The 4 black signals at the end of the sheet just after 22:00 UTC are what has been defined as helicopter signals by PNSN.

They show clearly on VALT and JUN and the separation would definitely indicate a moving target which on the fourth pass did not go over JUN.


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One Response to Notes for Mt St Helens Feb 2012 Archive

  1. Pingback: LA03 Music? | Quake Watch

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