Steve's picture

Escape from Egypt

Are you familiar with the story of Exodus? About 4000 years ago, Moses led the Hebrew people out of Egypt.  They were however, closely pursued by Pharaoh’s chariots. The story states that some relative motion of water and land delayed or destroyed the Egyptian forces and allowed the Hebrews to escape.

We’ve all seen the Hollywood telling of this event in the “Ten Commandments”, where Charlton Heston splits the Red Sea for a while, then zips it back up over the tailing troops.

john's picture

Moderate Earthquake NE of Ottawa

A moderate earthquake originally estimated as having a magnitude M=5.0, but later downgraded to 4.8 and then 4.4, has struck NE of Ottawa, Canada.  It was felt over a wide range of eastern Canada and the northeastern part of the United States.  By our calculations, it struck in a region of low probability.

john's picture

More Comments on Data Issues ("Wonkish")

As discussed in previous posts, incomplete or unavailable data can seriously impact the quality of earthquake forecasts. In our case, these problems are associated with the Global Digital Seismic Network, funded and maintained by the US National Science Foundation, and the US Geological Survey, among others.  The data catalogs also contain contributions from local networks in various countries.

Steve's picture

Acqua Alta – Part II

Earlier we learned half of the Acqua Alta story in terms of favorable tides. The second half of the lesson involves resonance.

Thumbnail Tutorial Continued:

(2) Resonance: I discussed resonance previously here under the title “Seismic Slosh”...

In that example, the resonance was in reservoirs and the cause was seismic shaking. 


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