- 'N Yo' Seismic Network: Marshawn Lynch Shakes the PNSN!
- Swarms in Eastern Washington: are there fewer now than in the past?
- New Algorithm GFAST Enhances the ShakeAlert Earthquake Early Warning System
- Don't Get Scared, Get Prepared!
- Beast Quake (Taylor's Version) (From The Vault)
- Looking at the M3.9 Fall City Earthquake with PNSN.org Tools
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2012
48
- December 1
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March
8
- The wech-o-meter takes over all of Cascadia
- Keystone Cops: Italy prosecutes seismologists for failure to predict deadly quake
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- Tunneling rumbles south under Capitol Hill
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February
7
- 15 years of mostly silent magma inflation near Three Sisters, Oregon
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-
January
11
- Slow slip: A new kind of earthquake under our feet
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- Fast chatter on Rainier an hour ago
- Can slush-mageddon trigger earthquakes?
- Rainier Repeating Earthquakes Update and Comparison with Weather Patterns
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- Repeating Earthquakes on Mount Rainier - are glaciers the culprit?
- Debunking another SEC football myth by the PAC-12
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2011
17
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December
13
- One year ago, Seattle Seahawks 12th Man Earthquake
- The odds this year of a megaquake on the Pacific Northwest coast
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- Good vs evil in central US earthquake hazard analysis
- Why does a volcano scream?
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- Invisible changes under the hood at the PNSN
- Sound Transit Tunneling Noise
- "Visionary" toads
- Earthquake early warning in the PNW
- November 1
- March 2
- February 1
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December
13
The chattering on Rainier showed a new pattern for a few minutes this morning, a burst of noise, then rapid pops. The pops started out rapid, then became less frequent until they blended into the background cacophony after a few minutes.
This is 10 minutes of spectrogram (click on figure for bigger version). The pops start out less than a few seconds apart, then spread to about 30 seconds apart by the right side of the plot.
Unfortunately, the two other stations atop Mount Rainier were feeling under the weather, and so cannot help us figure out whether the unusual signal is local to station RCS or more widespread.
Likely, something slumped on the side of the mountain, abruptly setting a glacier into motion, and the glacier skidded to a stop gradually. Or something else happened. Thanks to eagle-eyed seismogram-watcher Tara for pointing this out to Kate, and Kate to pointing it out to me.
[Added next day] Seth Moran at CVO dug up another example from a year ago, clearly a small set of pops, this time near the station STAR. Also a 10-minute record, again click for a bigger version.
[added 1/21]
and another starting at 9 UTC on 1/21 (this morning). I'm not sure whether these are uncommonly common this week, or if we know what to look for now. Note that while this signal is on the same station as the first one last week, it has a different pattern of vertical peaks and gaps for each pop, probably indicating activity in a different place than last week.