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The Hawaiian Volcano Observatory (HVO) is part of the U.S. Geological Survey's Volcano Hazards Program. Founded in 1912 by Thomas A. Jaggar, HVO was the first of the five volcano observatories supported by USGS today.
HVO's methods of observing and analyzing data from instruments and field studies have changed dramatically since Jaggar's time. Presently, our monitoring network across the island consists of more than 200 sensors, including seismometers, GPS, tiltmeters, infrasound, gas detectors, and thermal/visual cameras. These sensors transmit data to HVO 24 hours a day in order to track activity and support research into how volcanoes work.
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