U.S. Geological Survey Releases New National Seismic Maps
GNSS technology playing an ever-greater role in earthquake forecasting and warning systems
“An accompanying USGS report, “Documentation for the 2014 Update of the United States National Seismic Hazard Maps,” acknowledged the increasing role of geodetic data, derived primarily from high-accuracy, continuously operating GPS reference stations, in assessing earthquake risk.
While all states have some potential for earthquakes, 42 of the 50 states have a reasonable chance of experiencing damaging ground shaking from an earthquake during the next 50 years. The hazard is especially high along the West Coast, intermountain West, and in several active regions of the central and eastern United States, such as near New Madrid, Missouri, and near Charleston, South Carolina.”
Learn more at http://www.insidegnss.com/node/4088
The 10 Most Important Maps in U.S. History
“America was made out of pieces of paper. There are the pieces we all know about—the Declaration of Independence, the Constitution, the Bill of Rights. Then there are those lesser-known sheets of paper on which the changing features and borders of our country were drawn.
Maps have played a crucial role, ever since the discovery of the New World, in publicizing the discoveries of explorers, altering perceptions of control, and refereeing the claims of competing powers in finally setting the shape of the United States of America. It’s not too strong a statement to say that without these pieces of paper, the United States as we know it would never have existed—or else, it would look radically different today. Here are 10 of the most important maps in making the dream of our nation a reality.”
See all 10 at Mental Floss
“Jean-Félix Picard was born on this day in 1620 in La Flèche, France. He’s worth celebrating because in 1671, he published Mesure de la Terre, the first accurate measurement of the Earth’s size.He managed to measure the size of the Earth to within fractions of our current best-estimates using triangulation, mathematics, and a whole lot of patience.”
learn more at io9
Mapping a German U-boat
E/V Nautilus revisits the wreck of German U-boat U-166, sunk in the Gulf of Mexico during World War II. On this trip, the main goal was to map the wreck using Hercules’ high-resolution mapping system.