The devices are similar to those used for monitoring volcanoes like Mount St. Helens , in Washington , but because Iceland is relatively small , the network is densely concentrated .
Washington /location/location/contains Mount St. Helens
DT NNS VBP JJ TO DT VBN IN VBG NNS IN NNP NNP NNP , IN NNP , CC IN NNP VBZ RB JJ , DT NN VBZ RB VBN .
Washington
LOCATION
Mount St. Helens
ORGANIZATION
/location/location/contains