Mega Tsunami Happen ~ Simulation of Past &...

Given the recent Indonesian disaster with Krakatoa Junior collapsing with consequent tsunami, it's worth looking at other examples of the same, including this simulation of Fogo in Cabo Verde several tens of thousands of years ago... And, of course, Krakatoa Senior some ~150 years ago was a whopper... But let's not stop there, here's the most likely thing (other than another Hurricane Sandy) to clobber the US Eastern Seaboard, La Palma in the Canarys going...

Cascadia Tsunami ~ Understanding Tectonic Risk

Kathryn Schulz writes in The New Yorker of The Really Big One...

"An earthquake will destroy a sizable portion of the coastal Northwest. The question is when. [...] At approximately nine o’ clock at night on January 26, 1700, a magnitude-9.0 earthquake struck the Pacific Northwest, causing sudden land subsidence, drowning coastal forests, and, out in the ocean, lifting up a wave half the length of a continent. It took roughly fifteen minutes for the Eastern half of that wave to strike the Northwest coast. It took ten hours for the other half to cross the ocean. [...] We now know that the Pacific Northwest has experienced forty-one subduction-zone earthquakes in the past ten thousand years. If you divide ten thousand by forty-one, you get two hundred and forty-three, which is Cascadia’s recurrence interval: the average amount of time that elapses between earthquakes. That timespan is dangerous both because it is too long -- long enough for us to unwittingly build an entire civilization on top of our continent’s worst fault line -- and because it is not long enough. Counting from the earthquake of 1700, we are now three hundred and fifteen years into a two-hundred-and-forty-three-year cycle."

Here's a simulation of what happened back in 1700... And here's a geologist's discussion... Finally, documentary shock & awe imagery... NYTimes' DotEarthling Andrew Revkin weighs in too, with nice infographic showing past 8.0 and 9.0 events over 10K years...

Tsunami 2004 ~ Recalling Boxing Day Disaster...

The Boxing Day 2004 earthquake and tsunami in the Indian Ocean -- ten years ago today, December 26th -- was one of the biggest natural disasters in modern memory, killing over a quarter-million people without (much) warning within 4-6 hours in at least a dozen countries -- and triggering unprecedented humanitarian relief efforts. There are several retrospective documentaries of note, but here's a sampling... For those interested in quantifying the catastrophe, first note this NOAA simulation of the tsunami wavefront... Second, look at this seismographic plot from around the world showing the Earth literally ringing from the rupture of the Sunda megathrust off the coast of Sumatra, Indonesia...

We're learning ever more about quakes and tsunamis and NOAA's research and warning system is on the frontline... Nevertheless, the colossal power of plate tectonics is only one of the deadly natural perils mankind faces. Just one modest-sized asteroid hit, say like Eltanin or Chicxulub, would create quakes and tsunamis that make the Boxing Day disaster seem like ripples in a puddle. Simulate this for yourself via ImpactEarth! For civilizational survival, we need to figure out how to move humanity well beyond our cradle, ASAP.