Global volcanism 1975-1985: the first decade of reports from the Smithsonian Institution's Scientific Event Alert Network (SEAN)
Prentice Hall, 1989 - Nature - 655 pages
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aerosols April ash cloud ash emission ashfall avalanches B-type caldera cm/day cone continued crater floor Crater Lake crater rim declined decreased deflation deformation diameter early emitted episode erup eruption cloud eruption column eruptive activity explosive activity extrusion fissure flank fountaining fumaroles fumarolic activity Further Reference glow harmonic tremor height incandescent increased inflation Information Contact Island July June km altitude Krafla lapilli late lava dome lava flow lava lake lidar lobe magma main crater March maximum measured month nuees ardentes NZGS observed occurred period plosions plume Pu'u Pu'u O'o pumice pyroclastic pyroclastic flows Rabaul reached recorded reported rose satellite seismic seismic activity seismograph Sept showed SO2 emission Southern crater stations steam Strombolian summit crater summit elev temperature tephra tilt tiltmeter tion tivity Univ USGS vapor vent visible volcanic tremor volcano