To address our users' desire for a simple user interface to view the latest earthquakes in the Pacific Northwest, we have just released three features: a new recent events list, mobile views, and a Twitter feed that will tweet all PNSN events magnitude 2 or greater.
The new Recent EQ List is viewable under the earthquakes tab. This link formerly rendered the catalog search page. The catalog search can still be accessed under Earthquakes => Catalog Search. The list shows all events that occurred in the last two weeks within the reporting box (red) shown on our maps.
Mobile devices will now redirect to the respective mobile views for the recent list, recent map and all event pages. The mobile site has only been tested on iOS and Android and should be considered beta. Please note, this is not a mobile app. We welcome your feedback on any mobile bugs.
Our Twitter feed will now broadcast all magnitude 2 and greater PNSN events (located within the authoritative box shown on our maps). A tiny url to the event page will be included in the tweet. A tweet will be sent for each new event version for up to two hours after the event. You can find a link to our Twitter feed at the top right corner of all PNSN pages.
We welcome your feedback on any of these features.
Deep event is typical of seismicity near Seattle, has some aftershocks.
The ETS in central Oregon starting on Feb 24 seems to have finished on Mar 31. But, bursts of tremor continue in other parts of Cascadia. In fact during the Oregon ETS much of Cascadia has seen periods of tremor lasting from one to several days.
It has mostly been seismically quiet recently, although last night and this morning a swarm has been active in southern Oregon.
A workshop with 50 people met last month to chart the path to Earthquake Early Warning in the Pacific Northwest. Progress is encouraging.
The PNSN's in-depth blogs are here, and meanwhile our liveliest discussions on happening on Facebook.
Following three months of relatively little deep tremor in Cascadia the past month has seen bursts of activity up and down the region including what appears to be a full blown ETS starting in northern Oregon and spreading south.
Though the residents of Gold Bar may not have noticed, a swarm of hundreds of tiny earthquakes has been rumbling along just a few kilometers east of town since October 2012.
The Last Cascadia Great Earthquake and Tsunami; 313 Years and Ticking
January 24, 2013
by Bill Steele
The last great Cascadia Subduction Zone Earthquake occurred 313 years ago. We need to do more before the next one strikes.
Reports of a bright flash in the sky in eastern Washington this morning caused us to search seismograms for stations in the area which turned up what seems to be a "sonic" source that weakly was recorded on 9 seismographs. It is fairly common for bright flashes in the atmosphere, sometimes referred to as "fireballs", "meteors" or "bolides" to end up being recored seismically. Such recordings can allow us to pinpoint the time and location more accurately than can be done from eyewitness reports.
This has been a mild year, and our volcanoes have been well mannered, too.
Comments on Portland seismicity by PNSN staff seismologists.
Since Paul and I arrived in Seattle in 2006, there have been no quakes bigger than M4.5 in Oregon or Washington, and probably not because we are effective quakepolice.
New webicorder or "Seismogram" pages are now available for every channel of every instrument the PNSN maintains, and a few more. You once had to visit the UW Seismology Lab to get these data.
Most States in the US and countries around the world will join in a massive Duck, Cover and Hold earthquake drill Thursday, 10/18 at 10:18. Please join in! Where ever you are, "Duck, cover, and hold" at 10:18 am and do one more thing that day to get better prepared for the next big quake.
Geothermal project starts soon. We forecast some small quakes near Newberry Volcano.
October 3, 2012
by John Vidale
A novel experiment in mining energy from hot rocks is starting in a few days on the flank of Newberry Volcano, which may generate signals on nearby PNSN seismograms and small earthquakes in our catalog.
Thousands of coastal residents impacted by the Great Cascadia Subduction Zone Earthquake of 1700 shared their experience in stories and art.
Last Saturday, August 18, 2012 at 11:07:36 PM a magnitude 5.5 earthquake occurred east of the the Juan de Fuca Ridge, 253 km (157 miles) SW of Tofino, Canada. Several aftershocks followed. Some PNSN web site regulars were disappointed, even alarmed, that the earthquakes were not displayed on our recent earthquake map.
The next batch of Episodic Tremor and Slip (ETS) should be starting in Washington in the next month or two. In fact, after watching the Wech-o-meter for a few days I thought it might have already started early like the one last year did. But, about the time I was preparing to run around yelling that it had started, the tremor stopped. In e-mail discussions with tremor experts, Ken Creager and Aaron Wech about "has it started yet" we digressed into more arcane ruminations of what is an ETS and should we even talk about them. To become as confused as we are or bored out of your head .....
Seeing Through Rocks: Seismic Imaging of the Cascadia Subduction Zone
August 3, 2012
by Kate Allstadt
A glimpse into our local Cascadia subduction zone using marine seismic reflection imaging
Some like it hot - but that's not how it is.
Just in case anyone is wondering, within the accuracy of current measurements, plus/minus 0.2 mm/yr, the Earth is staying the same size. Not inflating nor collapsing - plate tectonics works.
Seismic networks see lightning and thunder, last week at Newberry Volcano.
Webmaster Jon Connolly is enabling custom searches for areas and times of interest. Read for details.
The 1969-2012 distribution of earthquakes over magnitude 4 highlights the location of earthquake-prone regions in Oregon and Washington, with the exception of the biggest fault, the plate-boundary megathrust.
Recent Posts
- 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
Archives
- 2013 (10)
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2012 (48)
- December (1)
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- October (3)
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- May (4)
- April (2)
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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
- 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
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February (7)
- 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
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January (11)
- 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
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2011 (14)
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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
- 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)
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December (13)