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And this summit explosion, how? what tools? >> usgs founded the volcano observatory in 1912, if you can believe. theyve been constantly monitoring it because they know how active and interesting it is. both from scientific aspect, but potential dangers involved. elizabeth: sure. >> they have seismic instruments all over and cameras able to focus in on the summit and see in active and infrared and they can see the lava lake fall and they can measure the volcanic gases, one of the biggest hazards....