January 18, 2012
by John Vidale
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.
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.
- Three new ways to view recent earthquakes in the Northwest
- M3.5 event west of Tacoma early Sunday morning
- Oregon ETS is over, but....
- Small swarm near Mount McLoughlin last night
- Earthquake early warning workshop quick report
- thePNSN Facebook discussions
- Deep Tremor over much of Cascadia
- Small earthquakes under Gold Bar
- The Last Cascadia Great Earthquake and Tsunami; 313 Years and Ticking
- A flash in the sky, a thump in the ground
- April (3)
- March (4)
- February (1)
- January (2)
- December (1)
- November (2)
- October (3)
- September (1)
- August (3)
- July (2)
- June (4)
- May (4)
- April (2)
- The wech-o-meter takes over all of Cascadia
- Keystone Cops: Italy prosecutes seismologists for failure to predict deadly quake
- UFOs in eastern Washington? No, rather UTEs (Unidentified Terrestrial Events)
- New Sodo Seattle Liquefaction Array Installed
- Why we should constantly watch the deformation of the seafloor
- Mystery chirp near Newberry Volcano
- Planting seismographs causes earthquakes? or maybe ice-quakes?
- Tunneling rumbles south under Capitol Hill
- 15 years of mostly silent magma inflation near Three Sisters, Oregon
- Mount Hood earthquake swarm of Feb 23, 2012
- Web glitches: duplicate (and even triplicate!) earthquakes
- How earthquake magnitude scales work
- Mine blast masquerades as volcanic tremor
- The Spokane Swarm about 10 years ago
- Another hum around Mount St. Helens
- Slow slip: A new kind of earthquake under our feet
- PNSN and social media
- 3am M3.4 earthquake in St. Helens Seismic Zone
- The wrong kind of volcano noise
- Fast chatter on Rainier an hour ago
- Can slush-mageddon trigger earthquakes?
- Rainier Repeating Earthquakes Update and Comparison with Weather Patterns
- 22-minutes drumbeat icequakes(?)
- Mount Rainier popping away
- Repeating Earthquakes on Mount Rainier - are glaciers the culprit?
- Debunking another SEC football myth by the PAC-12
- One year ago, Seattle Seahawks 12th Man Earthquake
- The odds this year of a megaquake on the Pacific Northwest coast
- Is the plague of great earthquakes this decade a sign of increased danger?
- Nile Valley landslide talks to PNSN seismologists
- Good vs evil in central US earthquake hazard analysis
- Why does a volcano scream?
- Predicting big quakes from patterns of little ones
- 1-hour warning for Japanese M9 earthquake?
- Sound Transit train under Interlaken keeps a rollin'
- Invisible changes under the hood at the PNSN
- Sound Transit Tunneling Noise
- "Visionary" toads
- Earthquake early warning in the PNW
- November (1)
- December (13)