Source:

Officials have raised the Alert to Orange for 3 Alaska volcanoes -SEMISOPOCHNOI VOLCANO, PAVLOF VOLCANO and GREAT SITKIN VOLCANO – after officials monitored elevated seismic activity and small explosions at each of these peaks. Meanwhile, the CLEVELAND VOLCANO is in Yellow Alert, meaning that episodes of lava effusion and explosions can occur without advance warning…

Semisopochnoi volcano

51°55’44” N 179°35’52” E, Summit Elevation 2625 ft (800 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Seismicity has remained elevated with intermittent bursts of activity over the past day. No explosive activity was detected in regional infrasound data or in partly cloudy satellite and cloudy web camera views.

Small eruptions producing minor ash deposits within the vicinity of the active north crater of Mount Cerberus and ash clouds usually under 10,000 feet above sea level have characterized the recent activity, which shows no signs of abating. Small explosions may continue to occur and could be difficult to detect, especially during poor weather conditions.

Pavlof Volcano

55°25’2″ N 161°53’37” W, Summit Elevation 8261 ft (2518 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Seismicity has remained elevated over the past day with small explosions detected in infrasound data last night at 20:16 ADKT (04:16 UTC) and this morning at 07:16 AKDT (15:16 UTC).

A small ash emission was observed in the web camera imagery at 16:01 AKDT yesterday (September 27, 00:01 UTC). No activity was observed in partly cloudy satellite imagery.

Small explosions accompanied by low-level ash emissions could happen at any time, and are typically a hazard in the immediate vicinity of the summit.

The level of unrest at Pavlof can change quickly and the progression to more significant eruptive activity can occur with little or no warning.

Great Sitkin Volcano

52°4’35” N 176°6’39” W, Summit Elevation 5709 ft (1740 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Seismicity has remained elevated over the past day. No unusual activity was observed in cloudy satellite and web camera views.

There is no indication of how long lava effusion will continue during the current eruption, and it is possible that explosive activity could occur with little or no warning.

Cleveland Volcano

52°49’20” N 169°56’42” W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

No significant seismic or infrasound activity was detected over the past day. No unusual activity detected in cloudy satellite and web camera data.

Episodes of lava effusion and explosions can occur without advance warning. Explosions from Cleveland are normally short duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible, but are less likely and occur less frequently.

What are Alert levels and aviation color codes and what they mean?

The USGS alert-level system for volcanic activity has two parts:

  1. Alert Levels inform people on the ground about a volcano’s status
  2. Aviation color codes inform the aviation sector about airborne ash hazards

Alert levels from USGS

USGS Alert levels during volcanic eruptions
USGS Alert levels during volcanic eruptions. via USGS

Aviation color codes by USGS

Aviation color codes during volcanic eruptions
Aviation color codes during volcanic eruptions

Always be ready! [AVO]

Now subscribe to this blog to get more amazing news curated just for you right in your inbox on a daily basis (here an example of our new newsletter).

You can also follow us on Facebook and/ or Twitter. And, by the way you can also make a donation through Paypal. Thank you!

You should really subscribe to QFiles. You will get very interesting information about strange events around the world.