14 research outputs found
Changes in gas composition prior to a minor explosive eruption at Masaya volcano, Nicaragua
No full textA small explosive eruption at Masaya volcano on 23 April 2001, in which a number of people were injured, was preceded by a distinct change in plume gas compositions. Open-path Fourier transform infrared spectroscopy (FTS) measurements show that the SO2/HCl molar ratio increased from 1.8 to 4.6 between April 2000 and April/May 2001. The SO2 flux decreased from 11 to 4 kg s-1 over this period. We interpret these changes to be the result of scrubbing of water-soluble magmatic gases by a rejuvenated hydrothermal system. A sequence of M 5 earthquakes with epicentres about 7 km from the volcano occurred in July 2000. These may have altered the fracture permeability close to the magmatic conduit, and caused increased magmatic-hydrothermal interaction, leading eventually to the phreatic explosion in 2001. Continuous FTS measurements at suitable volcanoes could provide useful information in support of eruption prediction and forecasting. © 2003 Elsevier Science B.V.
Activation of biceps femoris long head reduces tibiofemoral anterior shear force and tibial internal rotation torque in healthy subjects
No full textMeasurements of volcanic SO2 and CO2 fluxes by combined DOAS, Multi-GAS and FTIR observations: a case study from Turrialba and Telica volcanoes
No full textA Ligand-observed Mass Spectrometry Approach Integrated into the Fragment Based Lead Discovery Pipeline
No full textMajor and trace element distributions around active volcanic vents determined by analyses of grasses: implications for element cycling and bio-monitoring
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