Changes in gas composition prior to a minor explosive eruption at Masaya volcano, Nicaragua
A 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 betwe...
| Main Authors: | , , , , , |
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| Format: | Journal article |
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2003
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| _version_ | 1826263712878559232 |
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| author | Duffell, H Oppenheimer, C Pyle, D Galle, B McGonigle, A Burton, MR |
| author_facet | Duffell, H Oppenheimer, C Pyle, D Galle, B McGonigle, A Burton, MR |
| author_sort | Duffell, H |
| collection | OXFORD |
| description | A 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.. |
| first_indexed | 2024-03-06T19:56:10Z |
| format | Journal article |
| id | oxford-uuid:25ab1554-46ba-49b7-a9ed-40324c66df4c |
| institution | University of Oxford |
| last_indexed | 2024-03-06T19:56:10Z |
| publishDate | 2003 |
| record_format | dspace |
| spelling | oxford-uuid:25ab1554-46ba-49b7-a9ed-40324c66df4c2022-03-26T11:56:45ZChanges in gas composition prior to a minor explosive eruption at Masaya volcano, NicaraguaJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:25ab1554-46ba-49b7-a9ed-40324c66df4cSymplectic Elements at Oxford2003Duffell, HOppenheimer, CPyle, DGalle, BMcGonigle, ABurton, MRA 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.. |
| spellingShingle | Duffell, H Oppenheimer, C Pyle, D Galle, B McGonigle, A Burton, MR Changes in gas composition prior to a minor explosive eruption at Masaya volcano, Nicaragua |
| title | Changes in gas composition prior to a minor explosive eruption at Masaya volcano, Nicaragua |
| title_full | Changes in gas composition prior to a minor explosive eruption at Masaya volcano, Nicaragua |
| title_fullStr | Changes in gas composition prior to a minor explosive eruption at Masaya volcano, Nicaragua |
| title_full_unstemmed | Changes in gas composition prior to a minor explosive eruption at Masaya volcano, Nicaragua |
| title_short | Changes in gas composition prior to a minor explosive eruption at Masaya volcano, Nicaragua |
| title_sort | changes in gas composition prior to a minor explosive eruption at masaya volcano nicaragua |
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