Wed, 22 Mar 2023, 15:00
AVO reported that earthquake activity near Takawangha had decreased in both rate and magnitude from the peak of the swarm recorded during 9-11 March. More than 800 earthquakes, including multiple M2 and above events, were detected beneath Tanaga Island at depths less than 9 km below sea level during 11-17 March. The decline in activity decreased the potential for an eruption, so AVO lowered the Volcano Alert Level to Advisory (the second lowest level on a four-level scale) and the Aviation Color Code to Yellow (the second lowest color on a four-color scale) on 16 March.
Tanaga Island as seen from space on 23 Feb (image: Sentinel-2)
The seismic crisis near the volcano has waned significantly both in magnitude and rate from the swarm peak during 9-11 March.
Wed, 15 Mar 2023, 15:00
AVO reported that the earthquake swarm at Takawangha that began in November 2022 started to decline on 1 March. Seismicity abruptly increased again on 8 March and was sustained, with M4 or lower earthquakes occurring at depths of less than about 6 km below sea level. Earthquake activity beneath Takawangha volcano and nearby Tanaga Volcano (8 km W), both on Tanaga Island, continued at a high rate during 8-9 March, with more than 100 events per hour at times.
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Fri, 10 Mar 2023, 04:03
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A distribution of earthquakes beneath Tanaga (left) and Takawangha (right) volcanoes over the past 48 hours (image: AVO)
The seismic activity continues to be elevated over the past 48 hours, a typical sign of magma pushing its way towards the surface.
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Thu, 9 Mar 2023, 09:13
AVO reported that the earthquake swarm at Takawangha that began in November 2022 was ongoing with 120 earthquakes located during 25 February-3 March. The number of events per day was highest on 28 February and 1 March, with over 50 earthquakes located on each of those days. Three earthquakes had magnitudes greater than 3, occurred at shallow depths of less than 6 km, and were located about 6 km E of the volcano.
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Wed, 8 Mar 2023, 15:00AVO reported that the earthquake swarm at Takawangha that began in November 2022 was ongoing with 120 earthquakes located during 25 February-3 March. The number of events per day was highest on 28 February and 1 March, with over 50 earthquakes located on each of those days. Three earthquakes had magnitudes greater than 3, occurred at shallow depths of less than 6 km, and were located about 6 km E of the volcano.
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Thu, 2 Mar 2023, 11:00
AVO reported that the earthquake swarm at Takawangha that began in November 2022 was ongoing with 120 earthquakes located during 25 February-3 March. The number of events per day was highest on 28 February and 1 March, with over 50 earthquakes located on each of those days. Three earthquakes had magnitudes greater than 3, occurred at shallow depths of less than 6 km, and were located about 6 km E of the volcano.
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Wed, 23 Nov 2022, 15:00On 18 November AVO raised the Aviation Color Code for Takawangha to Yellow (the second lowest level on a four-color scale) and the Volcano Alert Level to Advisory (the second lowest level on a four-level scale) based on increased seismicity. The number of small earthquakes detected near the volcano had increased during the previous few days and intensified during 17-18 November. The earthquakes were located at depths of 3-6 km below sea level with the largest magnitudes between 2 and 3.
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Sat, 19 Nov 2022, 13:07
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Tanaga volcanoes viewed from Hot Springs Bay on 11 June, 2021 (image: AVO)
The Alaska Volcano Observatory (AVO) recorded a swarm of small earthquakes in the vicinity of the volcano over the past few days.
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Fri, 10 Feb 2017, 08:32The recent earthquake swarm calmed down again and there are no other signs the volcano might be heading towards a new eruption.
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Wed, 8 Feb 2017, 06:00
On 10 February AVO stated that the seismic swarm that began at Takawangha on 23 January had significantly declined the previous week and that seismicity was nearly at background levels. The Aviation Color Code was lowered to Green and the Volcano Alert Level was lowered to Normal.
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Wed, 1 Feb 2017, 06:00On 3 February AVO stated that the seismic swarm that began at Takawangha on 23 January continued but at a decreased rate and intensity. The rate of earthquakes peaked at 190 events on 24 January, and since then had steadily declined; 2-8 events per day were recorded from late January to 3 February. Most of the events were located 7-8 km ESE, at shallow depths.
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Wed, 25 Jan 2017, 06:00
On 27 January AVO stated that the seismic swarm that began at Takawangha on 23 January had significantly decreased during the previous day. The rate of earthquakes peaked at 190 events on 24 January and had steadily decreased to 22 detected on 27 January. Most of the events were located 7-8 km ESE, at shallow depths.
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Tue, 24 Jan 2017, 19:26
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Location of the recent M4 earthquakes beneath Takawangha volcano (yellow circles)
The alert level of the volcano was raised to yellow as the Alaska Volcano Observatory detected an energetic earthquake swarm on Tanaga Island 6-7 km ESE of the volcano.
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Wed, 18 Jan 2017, 06:00
AVO reported that an energetic earthquake swarm on Tanaga Island began on 23 January, with earthquakes located 6-7 km ESE of Takawangha volcano, and was possibly due to brittle failure in the surrounding rock caused by magma movement. AVO raised the Aviation Color Code to Yellow and Alert Level to Advisory.
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