Separate the clip date from the report date
Look for archive labels, filming dates, volcano names and observatory credits. A report published today can legitimately use older footage to explain earlier eruptions. Record both the report date and the footage date when supplied. If the date is unknown, describe it as unidentified footage rather than calling it a current eruption.
Several vents or volcanoes can appear in one explanatory montage. Follow the named location at each transition instead of assuming the entire sequence depicts one place.
A webcam timestamp belongs to that camera view, not automatically to surrounding archive inserts.
Know what the USGS labels address
USGS describes a two-part system: ranked terms for a volcano’s status relevant to people on the ground, and aviation colour codes addressing airborne ash hazards. The two parts serve different information needs. A ground alert term and an aviation colour are therefore not interchangeable descriptions of everything happening at a volcano.
Do not transfer USGS definitions to another country’s system without checking that authority’s terminology. Similar colours can appear in different systems with different meanings.
Find the actual notification
USGS distinguishes a Volcano Activity Notice from an aviation-specific Volcano Observatory Notice for Aviation. The source notification supplies an issuing time and contextual explanation that a television icon may omit. Read the notice attached to the report’s date if studying historical coverage, or the relevant current observatory source if checking a developing event.
A change in label should be described with its date and stated reason. Do not infer an exact eruption time or guaranteed outcome from a colour alone.
Keep media interpretation separate from operational decisions
For a programme discussion, note the footage provenance, report timestamp, authority and exact label. For travel, aviation or local safety decisions, follow current responsible authorities and operators; an archived programme cannot provide that assessment. This article gives no present alert for any volcano. When sharing an extract, retain the archive marker and the explanatory caption so another viewer does not mistake an historical illustration for a live camera feed or an operational notice.
Related questions
Does a new report always contain new footage?
No. Check archive labels and recording dates.
Are ground alerts and aviation colours the same measure?
USGS describes them as two parts serving different information needs.
Sources and scope
Scope notes distinguish published documentation, supplied information and editorial methods. They do not report a hands-on service test.
- USGS volcanic alert-level system — Definitions of ground-status terms and aviation colour codes; no current volcano status claimed.
- USGS volcano notifications — Distinguishes ground-related activity notices and aviation-specific notifications.
