The Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA) reported that unrest continued at Turrialba between 3 September 2025 (local) and 4 September 2025 (local). The alert level at Turrialba remained at „Level 2 – Warning“ (on a 0–4 level scale).
Source: Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA)
Current Alerts:
Observatory alert level: „Level 2 – Warning“ (on a 0–4 level scale)
Aviation Alert Level: unavailable or not collected
Adapted from: Smithsonian / USGS Daily Volcanic Activity Report for Sep 4, 2025