August 21 , 2022 .
Alaska , Pavlof :
55 25’2″ N 161 53’37 » W,
Summit Elevation 8261 ft (2518 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
Pavlof Volcano continues to erupt from the active vent just below the summit on its east flank. Seismic tremor and numerous minor explosions were detected each day last week. Small ash emissions to 10,000 ft (about 3 km) above sea level were seen Wednesday and Thursday by passing airplanes and in webcam images. Explosions are short-lived and the ash that is erupted dissipates quickly near the summit. Elevated surface temperatures were observed in satellite images during clear weather reflecting the hot vent, but there was no evidence for active lava flows extending down the flank this week.
Periods of lava spatter and fountaining from the vent on the volcano’s upper east flank have been occurring since mid-November 2021. This activity has built a small cone and sent lava flows down the flank that melt the snow and ice and produce variable amounts of meltwater. The meltwater typically incorporates loose debris on the flank of the volcano and forms thin (less than 2 m thick) lahars. The lahar deposits extend down the east-southeast flank for several kilometers, not quite to the base of the volcano. Previous eruptions of Pavlof indicate that the level of unrest can change quickly and the progression to more significant eruptive activity can occur with little or no warning.
Pavlof is monitored by local seismic and infrasound sensors, satellite data, web cameras, and regional infrasound and lightning networks.
Source : AVO.
Photo : Ben David Jacob.
Iceland , Reykjanes Peninsula :
Earthquake of magnitude Mw3.2 on the volcano of Reykjanes.
Today (August 20, 2022) at 05:45 UTC a Mw3.2 earthquake occurred on the Reykjanes volcano. This is part of a longer pattern on this volcano. It happens when an eruption ends, when it will happen is impossible to know.
Source : Icelandgeology.net.
Photo : IMO
Ecuador , Reventador :
DAILY REPORT OF THE STATE OF THE REVENTADOR VOLCANO, Monday August 15, 2022.
Information Geophysical Institute – EPN.
Surface Activity Level: Moderate, Surface Trend: No change.
Internal activity level: Moderate, Internal trend: No change.
Seismicity: From August 19, 2022, 11:00 a.m. to August 20, 2022, 11:00 a.m.:
Explosion (EXP): 32
Long Periods (LP): 55
Emission Tremors (TREMI): 9
Harmonic Tremor (TRARM): 1
Rains / Lahars:
Light rains were recorded during the night, which did not generate lahars on the volcano.
Emission / ash column:
During yesterday afternoon, several ash emissions were observed with a West-South-West direction and heights of up to 1000 meters above the level of the crater. The Washington VAAC issued 1 statement of ash emission, with a height of 1,338 meters above crater level and heading west.
Other Monitoring Parameters:
The FIRMS system recorded 1 thermal alert and the MIROVA system recorded 1 moderate thermal alert in the last 24 hours.
Observation:
The area was clear during the afternoon yesterday when the above mentioned emissions were observed.
Alert level: Orange.
Source : IGEPN
Photo : Benjamin Bernard. (Archives).
Hawaii , Mauna Loa :
19°28’30 » N 155°36’29 » W,
Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
Activity Summary:
Mauna Loa Volcano is not erupting. Rates of seismicity remain slightly elevated above long-term background levels. Other Mauna Loa monitoring data streams—ground deformation, gas concentrations, visual appearance in webcams—show no significant changes.
Observations:
During the past week, HVO seismometers recorded approximately 96 small-magnitude (below M3.0) earthquakes below the summit and upper-elevation flanks of Mauna Loa. The majority of these earthquakes occurred at shallow depths less than 15 kilometers (9 miles) below sea level.
Global Positioning System (GPS) measurements show low rates of deformation in the volcano’s summit region continuing through the past week.
Concentrations of sulfur dioxide (SO2), hydrogen sulfide (H2S), and carbon dioxide (CO2), as well as fumarole temperatures, remain stable at both the summit and at Sulphur Cone on the upper Southwest Rift Zone.
Webcam views have shown no changes to the volcanic landscape on Mauna Loa over the past week.
Source et photo : HVO.
La Martinique , Mount Pelée :
Weekly report on the activity of Mount Pelee for the period from August 12, 2022 to August 19, 2022.
Between August 12, 2022 at 4 p.m. (UTC) and August 19, 2022 at 4 p.m. (UTC), the OVSM recorded at least one volcano-tectonic earthquake of magnitude close to 0. This low-energy earthquake was located inside the volcanic edifice about 1 km deep below the surface. This superficial volcano-tectonic seismicity is associated with the formation of micro-fractures in the volcanic edifice. This earthquake was not felt by the population.
During volcanic reactivation phases, periods of higher seismic activity often alternate with phases of lower seismicity. Since the reactivation of the hydrothermal-magmatic system (end of 2018), the OVSM has not recorded any earthquakes of volcanic origin during the month of May 2019 and less than 3 earthquakes in October 2019 and August 2020. This variability in the number of earthquakes has already, for example been observed following the reactivation of Soufrière de Montserrat.
An extension of two areas of degraded vegetation located between Morne Plumé and the Chaude River was observed during a helicopter flight carried out on February 9 and May 5, with the support of Dragon 972, and confirmed by analysis of satellite images. and drone (overflight of May 11).
The alert level remains YELLOW: vigilance.
Source : OVSM-IPGP.
Photo : rci.fm
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