Report on Irazu (Costa Rica) — 4 November-10 November 2020
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 4 November-10 November 2020
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2020. Report on Irazu (Costa Rica) (Sennert, S, ed.). Weekly Volcanic Activity Report, 4 November-10 November 2020. Smithsonian Institution and US Geological Survey.
9.979°N, 83.852°W; summit elev. 3436 m
All times are local (unless otherwise noted)
OVSICORI-UNA reported that Irazú’s seismic network recorded a significant landslide in the W part of the volcano on 4 November along with a lahar. A small thermal anomaly was detected in MODIS (Moderate Resolution Imaging Spectroradiometer) satellite data.
Geological Summary. The massive Irazú volcano in Costa Rica, immediately E of the capital city of San José, covers an area of 500 km2 and is vegetated to within a few hundred meters of its broad summit crater complex. At least 10 satellitic cones are located on its S flank. No lava effusion is known since the eruption of the Cervantes lava flows from S-flank vents about 14,000 years ago, and all known Holocene eruptions have been explosive. The focus of eruptions at the summit crater complex has migrated to the W towards the main crater, which contains a small lake. The first well-documented eruption occurred in 1723, and frequent explosive eruptions have occurred since. Ashfall from the last major eruption during 1963-65 caused significant disruption to San José and surrounding areas. Phreatic activity reported in 1994 may have been a landslide event from the fumarolic area on the NW summit (Fallas et al., 2018).