December 16, 2011
by John Vidale
On the 200th anniversity of the landmark New Madrid earthquake sequence, there is a brouhaha about the seismic hazard estimations around New Madrid, Missouri. NPR in St. Louis summarizes it this way. This has been a spectacle undermining the confidence of the public in seismologists and the USGS as well as the political process. For the long version of a sensible view (IMHO), see the report from the Panel I chaired this spring. Here are the highlights.
The area near the junction of Arkansas, Missouri, Tennessee, and Kentucky had a set of bad earthquakes in 1811 and 1812. Further research has shown that similar earthquakes had recurred several times in the previous 2000 years. However the risk has been difficult to evaluate, as the ground is not measurably deforming and the fault system in the area is poorly understood.
High earthquake danger has been estimated by the USGS for good reasons - the history of frequent recent earthquakes, the ability of ground to the East to transmit strong motions efficiently, and the vulnerability of eastern cities. So the hazard near New Madrid stands out as a red bull's eye on the national map.
No danger is forseen by Northwestern Prof. Seth Stein in his new book Disaster Deferred and numerous radio interviews and talks for the highly speculative, although conceivably correct, reason that in the long run, faults must reload by tectonic motions, and New Madrid has deformed precious little in the last decade. He and his former student Mike Wysession go so far as suggest the USGS has lost objectivity because high hazard results in more attention and work for them.
As a result, some emergency managers and legislators have felt free to choose the most convenient assessments to favor. This issue involved lots of money as well as public safety because earthquake safe buildings cost a few percent more, which adds up to many tens of millions of dollars or more. Even more seriously, large projects may be located on the basis of safety, and even mild earthquake danger may steer the construction toward less shaky ground.
- Glacier outburst flood on Mount Baker recorded by the PNSN
- 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
- 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)