Makushin volcano (Aleutian Islands): fluctuating seismicity continues
mer., 1 juil. 2020, 06:1806:18 AM | AUTEUR : MARTIN
The Alaska Volcano Observatory (AVO) reported that the seismicity continues at fluctuating levels since 24 June. This is associated with two earthquakes on 28 June with magnitude M 3.0 and 3.8 at 16:53 and 18:02 local time. All of the earthquakes are clustered about 10 km (6 miles) east of the summit of the volcano at a depth of about 8 km (5 miles). The largest earthquakes have been felt strongly by residents of Unalaska.
Makushin volcano today (image: AVO)
The exact cause of this increased earthquake activity, in terms of possible volcanic or tectonic processes, is uncertain at this time. The earthquakes may be related to the movement of magma beneath the east side of the volcano, interactions between an earthquake fault and the nearby geothermal field, the activation of more than one fault in this area, or a combination of these scenarios.
Because of the distance and depth of the locations of the earthquakes from the summit of Makushin Volcano, and the absence of other forms of volcanic unrest such as increased steaming, gas emission, or ground deformation, there is no indication that the present earthquake sequence will necessarily lead to a volcanic eruption.
Source: Alaska Volcano Observatory volcano activity update 1 July 2020
mer., 24 juin 2020, 06:00
Makushin volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 24 June-30 June 2020 (New Activity / Unrest)
AVO reported continuing numerous smaller earthquakes in an area about 10 km E of the Makushin's summit at a depth of about 8 km during 24-30 June; the frequency and magnitude had been declining since 15 June but the rate became variable on 24 June. No surficial activity was visible in satellite or webcam images; only typical minor steaming from summit crater lake. Earthquakes with a M 3 and M 3.8 were recorded at 1653 and 1802 on 28 June, with the larger event strongly felt in Unalaska (14 km E). ... Read all
jeu., 18 juin 2020, 07:31
The Alaska Volcano Observatory (AVO) reported that the activity of the volcano continues at low levels over the past days. ... Read all