Seven US volcanoes were previously under Green status, but now the USGS has upgraded them to Advisory and Watch or Yellow and Orange status, respectively.
7 US Volcanoes
Seven of the more than 160 volcanoes that the USGS continuously monitors throughout the country are showing signs of increased activity. Two of them are on a heightened WATCH / ORANGE status as a result of the activity, while five are in an ADVISORY / YELLOW level.
The other volcanoes that USGS is keeping an eye on right now are all either GREEN or unrated.
Great Sitkin: Watch - ORANGE
Alaska Volcano Observatory AVO reports that the volcano is likely still experiencing a sluggish lava eruption, which is creating a substantial lava flow inside the summit crater. According to AVO, the Great Sitkin Volcano has been slowly erupting lava since July 2021, although no explosive events have yet taken place.
Semisopochnoi: Watch - ORANGE
The AVO found no indication of explosive activity in the geophysics data collected over the previous day. Webcam and satellite views of Semisopochnoi Island's Mount Young were obstructed by clouds, making it impossible to see any activity. Over the preceding day, volcanic tremors were occasionally seen, as has been characteristic of recent activity. However, USGS adds a warning that it may be challenging to identify small explosions and related ash emissions, particularly when dense cloud cover hides the volcano.
Kilauea: Advisory - YELLOW
The recent surge in inflation was brief and amounted to less than a microradian, according to the Hawaii Volcano Observatory (HVO), which also stated that slow, constant inflation persists in the volcano. Overall, inflation at Kilauea's summit is higher than it was before the summit eruption on January 5, 2023. Since April 16, there have been sporadic small earthquakes beneath Halemaumau, Keanakoi Crater, and the southern edge of Kaluapele (Kilauea caldera). There may be more earthquake flurries as summit earthquake rates continue to be high. On May 3, the rate of sulfur dioxide (SO2) emissions was recorded as being around 135 tonnes per day.
Aniakchak: Advisory - YELLOW
The Aniakchak volcano continues to experience earthquake activity during the last day, according to AVO. Over the previous day, clouds have mostly covered satellite and web camera footage. According to the Smithsonian Institute Global Volcanism Program, the current phase of seismic instability started in October 2022. Other volcanoes with similar geology have historically seen increases in seismic activity without any following eruptions.
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Takawangha and Tanaga: Advisory - YELLOW
Over the past 24 hours, there has been increased seismic activity beneath Takawangha and the neighboring Tanaga Volcano, according to AVO through USGS. If a future eruption were to take place, it would be preceded by increased shallow seismicity as well as potential signals of instability such as gas releases, elevated surface temperatures, as well as additional surface deformation.
Trident: Advisory - YELLOW
According to AVO, there has been a modest rise in the frequency of shallow earthquakes close to Trident over the previous two days. Variation in the rate of earthquake activity is usual during times of disturbance. The data from largely cloudy satellites and webcams showed no other activity. On August 24, 2022, the current seismic unrest started, WeatherBoy reports.
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