January 31, 2012
by John Vidale
As it has been quiet for a few days since the military jets buzzed Mount St. Helens, I'll plagiarize from and link a paper of mine that appeared this past month.
Slow-slip episodes are news because they strike the deeper portion of the Cascadia subduction zone (and many other faults) previously thought to move boringly steadily, they take a long time to complete, and they can recur almost like clockwork. Traditional earthquakes share none of those characteristics.
Figure - Evolution of a single slow-slip episode in the Cascadia subduction zone. The episode started with the deep blue dots near the southern end, spread bilaterally for a few days, and continued to the north for the rest of the 2 weeks shown. (Courtesy of Aaron Wech.)
Can slow slip be helpful in assessing the threat of great earthquakes? It’s possible, and that possibility is one of the motivations for the current studies.
The discovery of slow slip has inspired geophysicists and remains the focus of intense attention. Dense arrays of seismometers are being planted in several places, which we hope will resolve many of the questions framed above. As Yogi Berra said, “You can observe a lot by watching”.
But for the full length article, tempered to be easy to read by a capable editor and with professional figures, look at the whole article.
- Three Cascadia ETS events in past month??
- Is Mount St. Helens seismicity increasing?
- Warm weather triggers snow avalanches at St. Helens
- Seismic recordings of a gas explosion in North Bend, WA
- Seismic signals generated by the March 22nd Oso Landslide
- Legacy web site content returns
- Ice avalanches on Cascade volcanoes
- A New View On What's Shaking on the Cascade Volcanoes
- Seismic Spectrograms - A new way to look at wiggles
- The final football game analysis
- September (1)
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- January (4)
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- June (4)
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- 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)