Asking, “Is a badge on Foursquare worth your life?”, the U.S. Army has posted a warning to its service members that geotagging photos on social media sites like Facebook is a severe security risk. Soldiers uploading geotagged photos onto social media sites are unwittingly broadcasting their locations. An unfortunate real world example from 2007 was explained by Steve Warren, deputy G2 for the Maneuver Center of Excellence, or MCoE:
Warren cited a real-world example from 2007. When a new fleet of helicopters arrived with an aviation unit at a base in Iraq, some Soldiers took pictures on the flightline, he said. From the photos that were uploaded to the Internet, the enemy was able to determine the exact location of the helicopters inside the compound and conduct a mortar attack, destroying four of the AH-64 Apaches.
The moho (short for Mohorovičić discontinuity) is the the boundary between Earth’s crust and mantle. The European Space Agency agency has produced the first global high-resolution map of the moho from data from ESA’s GOCE gravity satellite via its The GOCE Exploitation for Moho Modelling and Applications project – or GEMMA. The moho was named after Croatian seismologist Andrija Mohorovičić who discovered in 1909 that there is a change in seismic speed 50 km under the earth’s surface. The earth’s moho ranges from about 70 km in depth in mountainous areas, like the Himalayas, to 10 km beneath the ocean floor.
For the first time, it is possible to estimate the Moho depth worldwide with unprecedented resolution, as well as in areas where ground data are not available. This will offer new clues for understanding the dynamics of Earth’s interior, unmasking the gravitational signal produced by unknown and irregular subsurface density distribution.