posted on Sep, 20 2014 @ 12:05 PM
This is a fun diversion from Bardarbunga, for a few minutes.
Yesterday's weekly update from the
Cascades Volcano Observatory contained the
following:
Recent Observations:
A short 10-minute-long burst of small deep (~10 km, or ~6 miles) low-frequency events occurred at Newberry on the evening of September 17th this week,
similar to another short-lived sequence that occurred at Newberry on 07/31.
Such events occur on occasion at most monitored Cascade volcanoes, particularly Mounts Baker, Rainier, and Hood, and although unusual, are considered
to be part of normal background seismic activity at these volcanoes.
I found the events beginning at 05:54 UTC on the 18th, which would have been 10:54 p.m. Pacific time on the 17th September. Here are the two
spectrogram images, showing the low-frequency events:
(click images for larger version)
image 1 and
image 2
Low frequency quakes (notice the absence of signals higher than approximately 10 Hz) are also known as long period quakes, or LP's.
Volcanically-caused long period earthquakes are produced by vibrations generated by the movement of magma or other fluids within the volcano.
From
pnsn.org
This is an image of the events on a nearby
webicorder--
SVIC.CC..EHZ
(long coda for such tiny magnitudes)(click image to see the right-hand side)
Finally, 3 quakes made it to the USGS map:
I think it's cool to see a tiny sign of life from one of the other Cascade volcanoes.
edit on 9/20/2014 by Olivine because: (no reason
given)
ETA:
It looks like something may be building at Bardarbunga at the moment.
source
edit on 9/20/2014 by Olivine because: bardy update
edit on 9/20/2014 by Olivine because: (no reason
given)