Volcanic Trouble in Hawaii has now spread elsewhere.
In the last 24 hours, the monitoring systems at Popocatépetl volcano in Mexico registered 26 exhalations with emissions of steam and gas.
Today, Sunday, the Alaska Volcano Observatory has increased the alert level for the Sitkin Volcano from "NORMAL" to YELLOW after a steam explosion occurred there.
The Alaska Volcano Observatory (AVO) Statement appears below:
AVO/USGS Volcanic Activity Notice
Volcano: Great Sitkin (VNUM #311120)
Current Volcano Alert Level: ADVISORY
Previous Volcano Alert Level: NORMAL
Current Aviation Color Code: YELLOW
Previous Aviation Color Code: GREEN
Issued: Sunday, June 10, 2018, 1:26 PM AKDT
Source: Alaska Volcano Observatory
Location: N 52 deg 4 min W 176 deg 6 min
Elevation: 5709 ft (1740 m)
Volcanic Activity Summary: Earthquake activity at Great Sitkin Volcano has been elevated over the past five days, and earlier today at 11:39 AKDT (19:39 UTC), a signal that may represent a short-lived steam explosion was detected by seismic data. AVO is thus raising the Aviation Color Code and Alert Level to YELLOW/ADVISORY.
Great Sitkin Volcano is monitored by a five-station seismic network on Great Sitkin Island and with additional seismic stations on the nearby islands of Igitkin, Adak, Kagalaska, and Kanaga. A six-element infrasound array to detect explosions (atmospheric pressure waves) was installed on Adak Island in June, 2017, although it is currently (June 2018) only partly operational. AVO also uses satellite imagery to monitor Great Sitkin Volcano.
[Volcanic cloud height] not applicable
[Other volcanic cloud information] Unknown
Remarks: Great Sitkin Volcano is a basaltic andesite volcano that occupies most of the northern half of Great Sitkin Island, a member of the Andreanof Islands group in the central Aleutian Islands. It is located 43 km (26 miles) east of the community of Adak. Great Sitkin erupted at least three times in the 20th century, most recently in 1974. That eruption produced at least one ash cloud that likely exceeded an altitude of 25,000 ft above sea level. A poorly documented eruption occurred in 1945, also producing a lava dome that was partially destroyed in the 1974 eruption. A seismic swarm occurred from July 2016 through the end of 2017.
Contacts: Michelle Coombs, Scientist-in-Charge, USGS
David Fee, Acting Coordinating Scientist, UAFGI
The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.
THe advisory below was issued by the Mexican Volcano monitoring Agency (Google Translate)
June 10, 11:00 h (June 10, 16:00 GMT)
In the last 24 hours, through the monitoring systems at Popocatépetl volcano, were registered 30 exhalations with emissions of steam and gas (image 1). At night was possible to observed incandescence that increase with some exhalations (image 2).
At the time of this report the emission are dispersed to the south-southwest direction (image 3).
CENAPRED emphasizes that people SHOULD NOT go near the volcano, especially near the crater, due to the hazard caused by ballistic fragments (image 4) and in case of heavy rains leave the bottoms of ravines by the danger of landslides and debris flows.
The Volcanic Traffic Light Yellow Phase 2.
The scenarios foreseen for this phase are:
1. Explosive activity of low to intermediate level.
2. Ash fall in nearby towns.
3. Possibility of short range pyroclastic flows and mudflows .
Special emphasis is placed on the following recommendations:
1. Continue the safety radius of 12 km, so staying in that area is not allowed.
2. Keep the controlled traffic between Santiago Xalitzintla and San Pedro Nexapa through Paso de Cortés.
3. Civil Protection authorities, keep your preventive procedures, in accordance with their operational plans.
4. People, be alert to the official information disseminated.
In case of ashfall, address the following recommendations:
• Cover nose and mouth with a wet handkerchief or face mask.
• Clean eyes and throat with pure water.
• Avoid contact lenses to reduce eye irritation.
• Close windows or cover them up, and stay indoors as much as possible.
Popocatepetl Volcano monitoring is performed continuously 24 hours a day. Any change in activity will be reported in due course.