October 29, 2013
by Steve Malone
Yesterday a local pilot and well known mountain photographer, John Scurlock reported spotting avalanche debris in the east breach of Shurman Crater on Mount Baker. To quote John's e-mail: "the upper east face of Sherman Peak on Mount Baker had shed its huge buildup of snow in an avalanche that went down into the east breach of Sherman Crater and then on down Boulder Glacier". John provides us with his impressive photo of the source zone for this avalanche taken on Oct 27, 2013. (All photos are copy righted by John Scurlock)
The seismograms for this event are from MBW, located about 6 km due west of Mount Baker and SHUK, located at the Mount Baker ski area about 11 km to the east-northeast.
MBW PDT Oct, 21, 2013
SHUK PDT Oct 21, 2013
We also show spectrograms for these two stations and for RPW, located about 24 km to the southeast. Spectrograms show the frequency content of the seismic signals (vertical axis) versus time (horizontal axis) with the strength of the signal as colors going from blue (weak signal) to red (strong signal). This spectrogram is a preview of the type of information we will be routinely providing on our PNSN web pages in the future.
It is interesting to compare this event with a previous known similar event that took place on Jul. 25, 2006. Again, photos by John Scurlock show that the source zone is very similar to the recent avalanche but may have involved less material. Note the size of the debris pile in the east breach.
The amplitude on the seismograms from station MBW is consistent with the recent event being larger. The duration of the signal is similar but the amplitude of the 2006 event is significantly less.
More information about this event and similar ones can be found on the Mount Baker Volcano Research Center web site.
- Packers versus Seahawks game analysis -- too exciting
- Panther versus Seahawk Game Analysis
- Seismology will again watch/help the Seahawk's playoff run
- Canadian ETS morphing to Washington one?
- Great ShakeOut, Great success!
- The Great ShakeOut 2014 is Tomorrow!
- 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
- 2015 (3)
- November (1)
- October (2)
- September (1)
- July (1)
- May (1)
- April (1)
- March (2)
- February (3)
- January (4)
- October (1)
- September (1)
- August (1)
- June (1)
- 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)