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more cool science shit:

The use of seismology to detect remote explosions is not limited to nuclear test monitoring. It can also be used to learn about large explosions due to other causes, especially in foreign countries or inaccessible areas. Seismologists using publicly available information, for example, were able to determine that two separate explosions occurred when the Russian submarine Kursk sank in August 2000. A small explosion was followed about two minutes later by a second explosion that released about 16 times as much energy as the first and produced a magnitude 4.2 earthquake that was recorded as far as 5000 km away. It was further determined that the energy released in the second explosion was equivalent to that which would have been released by 2000 to 4000 kg (about 2 to 4 kilotons) of TNT. The depth of the second explosion was estimated from a bubble pulse produced during the explosion, which was caused when a bubble of hot gas oscillates while rising quickly through the water. The calculated depth of 100 m is about the same as the seafloor depth at the location of the Kursk accident, so the second explosion probably occurred when the sinking submarine struck the seafloor. More than 150 earthquakes with magnitudes of 1.4 to 1.6 occurred in the months after the sinking. They were probably caused by depth charges that were detonated by the Russian navy to discourage foreign submarines from visiting the wreckage. Similar studies have shed light on incidents such as the 1995 attack on the Murrah Federal Building in Oklahoma City; the 1998 truck-bombing of the American Embassy in Nairobi, Kenya; and the September 11, 2001 terrorist attacks on the World Trade Center and Pentagon.

http://www.espionageinfo.com/Re-Se/S...xplosions.html