| Autor: |
Richard James Brown, Walter Hernández, Demetrio Escobar, Eduardo Gutierrez, Julia Crummy, Rosemary Cole, Pierre-Yves Tournigand |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Volcanica, Vol 5, Iss 2, Pp 271-293 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2610-3540 |
| DOI: |
10.30909/vol.05.02.271293 |
| Popis: |
San Miguel (or Chaparrastique) volcano, El Salvador, erupted on the 29th December 2013, after almost 40 years of quiescence. Initial vent-clearing explosions ejected ballistic blocks and produced a pyroclastic density current (PDC) that flowed down the upper flanks. Plume rise speeds peaked at 50–70 m s-1 and declined over time. The main phase of the VEI 2 eruption produced a Subplinian plume that dispersed 106 m3 ash >20 000 km2 across El Salvador in to Honduras. Plume structure was complex due to strong wind shear and to contributions from co-PDC ash. Tephra fall deposits dispersed westwards include a basal white ash layer of ash-coated clasts and ash aggregates, a grey fine ash co-PDC layer, and a layer of coarse ash to fine lapilli-grade scoria. The eruption provides a useful case study to understand the range of volcanic activity at the volcano and to refine hazard maps. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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