This unusual bed in turbidites of the Upper Cretaceous Shumagin Formation (Alaska on Nagai Is) was affected by soft sediment deformation - ball and pillow structure. Liquifaction caused by shock?
January 5, 2025 at 1:48 PM
This unusual bed in turbidites of the Upper Cretaceous Shumagin Formation (Alaska on Nagai Is) was affected by soft sediment deformation - ball and pillow structure. Liquifaction caused by shock?
Graywacke beach pebbles. Few beaches are so uniform. This is from Nagai Island in the Aleutians (Alaska). These are from the Upper Cretaceous Shumagin Formation.
January 17, 2025 at 12:59 AM
Graywacke beach pebbles. Few beaches are so uniform. This is from Nagai Island in the Aleutians (Alaska). These are from the Upper Cretaceous Shumagin Formation.
December 1, 2024 at 8:30 PM
250,000 pounds of salt cod in a coverd store in 1915 Unga Island (Uĝnaasaqax̂ in Aleut) is the largest of the Shumagin Islands off the Alaska Peninsula in #Alaska , #UnitedStates. #fishing #marinebiology #maritimehistory #zooarchaeology #coastalhistory
April 28, 2025 at 9:12 AM
250,000 pounds of salt cod in a coverd store in 1915 Unga Island (Uĝnaasaqax̂ in Aleut) is the largest of the Shumagin Islands off the Alaska Peninsula in #Alaska , #UnitedStates. #fishing #marinebiology #maritimehistory #zooarchaeology #coastalhistory
⚒️ 🧪
A M7.3 earthquake struck offshore Alaska yesterday. This is the sixth earthquake above M7 in this small stretch of the subduction zone since 2020.
This was a weird strike-slip earthquake, reminiscent of a similar quake in 2020. Did these ruptures happen in the slab, the upper plate - or both?
A M7.3 earthquake struck offshore Alaska yesterday. This is the sixth earthquake above M7 in this small stretch of the subduction zone since 2020.
This was a weird strike-slip earthquake, reminiscent of a similar quake in 2020. Did these ruptures happen in the slab, the upper plate - or both?
Magnitude 7.3 earthquake in the Shumagin Gap, Alaska
Another exciting strike-slip earthquake in a classic subduction setting
earthquakeinsights.substack.com
July 17, 2025 at 11:39 PM
⚒️ 🧪
A M7.3 earthquake struck offshore Alaska yesterday. This is the sixth earthquake above M7 in this small stretch of the subduction zone since 2020.
This was a weird strike-slip earthquake, reminiscent of a similar quake in 2020. Did these ruptures happen in the slab, the upper plate - or both?
A M7.3 earthquake struck offshore Alaska yesterday. This is the sixth earthquake above M7 in this small stretch of the subduction zone since 2020.
This was a weird strike-slip earthquake, reminiscent of a similar quake in 2020. Did these ruptures happen in the slab, the upper plate - or both?
Map of M7.4 Alaska shallow thrust earthquake 🧪 today (approximate location with green star) in tectonic context using a figure from the 2021 Chignik earthquake paper from Ye et al. (2022). Today’s event appears to be located in Shumagin gap area.
July 16, 2023 at 7:43 AM
Map of M7.4 Alaska shallow thrust earthquake 🧪 today (approximate location with green star) in tectonic context using a figure from the 2021 Chignik earthquake paper from Ye et al. (2022). Today’s event appears to be located in Shumagin gap area.
The first mooring turnaround on #DY2603 was a success! 🙌
This site in Qagiiĝun (Shumagin Islands) records seawater temperature, salinity, oxygen, currents, and marine mammals. 🧪🌊🦑🐋
This site in Qagiiĝun (Shumagin Islands) records seawater temperature, salinity, oxygen, currents, and marine mammals. 🧪🌊🦑🐋
May 3, 2026 at 9:57 PM
The first mooring turnaround on #DY2603 was a success! 🙌
This site in Qagiiĝun (Shumagin Islands) records seawater temperature, salinity, oxygen, currents, and marine mammals. 🧪🌊🦑🐋
This site in Qagiiĝun (Shumagin Islands) records seawater temperature, salinity, oxygen, currents, and marine mammals. 🧪🌊🦑🐋
Wet on wet, I really soaked up my time on land... emphasis on the soaked.
#aleutianislands #popofisland #popof #Shumaginislands #Shumagin #sandpoint
#aleutianislands #popofisland #popof #Shumaginislands #Shumagin #sandpoint
February 19, 2025 at 10:36 AM
Wet on wet, I really soaked up my time on land... emphasis on the soaked.
#aleutianislands #popofisland #popof #Shumaginislands #Shumagin #sandpoint
#aleutianislands #popofisland #popof #Shumaginislands #Shumagin #sandpoint
November 21, 2024 at 1:33 AM
M7.4 shallow subduction thrust earthquake 🧪 in Alaska in Shumagin segment of subduction zone
https://www.emsc-csem.org/Earthquake_information/earthquake_map.php?id=1529242
https://www.emsc-csem.org/Earthquake_information/earthquake_map.php?id=1529242
July 16, 2023 at 7:27 AM
M7.4 shallow subduction thrust earthquake 🧪 in Alaska in Shumagin segment of subduction zone
https://www.emsc-csem.org/Earthquake_information/earthquake_map.php?id=1529242
https://www.emsc-csem.org/Earthquake_information/earthquake_map.php?id=1529242
First Temblor map (AFAIK) on bluesky! Today, a magnitude-7.2 earthquake struck of the coast of Alaska, at the western edge of the Shumagin Seismic Gap.
July 16, 2023 at 4:34 PM
First Temblor map (AFAIK) on bluesky! Today, a magnitude-7.2 earthquake struck of the coast of Alaska, at the western edge of the Shumagin Seismic Gap.
I've found that the Zoom auto transcription really struggles with Alaska place names. Shumagin Gap (part of the AK subduction zone) became Shoe Megan Gap. Yakutat block (a microplate colliding with southern AK) became Yak Attack block. I liked the imagery of that one.
July 16, 2025 at 5:07 PM
I've found that the Zoom auto transcription really struggles with Alaska place names. Shumagin Gap (part of the AK subduction zone) became Shoe Megan Gap. Yakutat block (a microplate colliding with southern AK) became Yak Attack block. I liked the imagery of that one.
We have a new paper on background seismicity and aftershocks associated with several recent large earthquakes along the Alaska Peninsula. The two events in the Shumagin segment triggered many more aftershocks in the upper plate than the larger Chignik earthquake. 🧪⚒️ bit.ly/4nJQHT8
Deep‐Learning‐Based Catalog of Background Seismicity and Aftershocks of the 2020–2021 Large Earthquakes Along the Alaska Peninsula | Seismological Research Letters | GeoScienceWorld
Abstract. The Alaska Peninsula section of the Alaska‐Aleutian subduction zone shows significant along‐strike variations in seismic activity and
bit.ly
September 22, 2025 at 11:30 PM
We have a new paper on background seismicity and aftershocks associated with several recent large earthquakes along the Alaska Peninsula. The two events in the Shumagin segment triggered many more aftershocks in the upper plate than the larger Chignik earthquake. 🧪⚒️ bit.ly/4nJQHT8
According to the Alaska Department of Fish and Game, fishermen in the Shumagin Islands and South Unimak areas harvested about 720,000 salmon through the end of June — the second-lowest June on record since the 1980s.
(From KUCB - Unalaska)
(From KUCB - Unalaska)
The June salmon harvest in the southern Alaska Peninsula was the worst in 4 decades
Meanwhile, Fish and Game is putting more restrictions on the fishery.
www.ktoo.org
July 16, 2025 at 12:20 AM
According to the Alaska Department of Fish and Game, fishermen in the Shumagin Islands and South Unimak areas harvested about 720,000 salmon through the end of June — the second-lowest June on record since the 1980s.
(From KUCB - Unalaska)
(From KUCB - Unalaska)
A new paper by Yinchu Li out in Nature Communications today shows that fluids are not always the explanation for creeping megathrusts..... Check it out! @gtresearch.bsky.social @nau-ses.bsky.social
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Electromagnetic imaging reveals insufficient fluids to explain shallow megathrust creep at the Shumagin Gap - Nature Communications
Controlled-source Electromagnetic imaging of the Shumagin Gap shows strong resistivity heterogeneity, with limited fluid volume and low inferred pore pressure along the shallow megathrust, suggesting ...
www.nature.com
March 31, 2026 at 10:22 PM
A new paper by Yinchu Li out in Nature Communications today shows that fluids are not always the explanation for creeping megathrusts..... Check it out! @gtresearch.bsky.social @nau-ses.bsky.social
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Today's M7.2 Alaska earthquake (sequence in blue) occurred within the aftershock zone (pinkish-purple) of the 2020 M7.8 Simeonof event, so could be considered a late aftershock. 🧪
Also note that the very shallow part of the Shumagin "gap" has not had any recent earthquakes.
Also note that the very shallow part of the Shumagin "gap" has not had any recent earthquakes.
July 16, 2023 at 11:27 AM
Today's M7.2 Alaska earthquake (sequence in blue) occurred within the aftershock zone (pinkish-purple) of the 2020 M7.8 Simeonof event, so could be considered a late aftershock. 🧪
Also note that the very shallow part of the Shumagin "gap" has not had any recent earthquakes.
Also note that the very shallow part of the Shumagin "gap" has not had any recent earthquakes.
🧪
A M7.2 earthquake occurred offshore Alaska last night - the latest in a series of large quakes that started in 2020. Although the megathrust has produced great earthquakes both east and west of here, this part is known as a "seismic gap".
Read more on my blog: earthquakeinsights.substack.com!
A M7.2 earthquake occurred offshore Alaska last night - the latest in a series of large quakes that started in 2020. Although the megathrust has produced great earthquakes both east and west of here, this part is known as a "seismic gap".
Read more on my blog: earthquakeinsights.substack.com!
July 16, 2023 at 3:32 PM
🧪
A M7.2 earthquake occurred offshore Alaska last night - the latest in a series of large quakes that started in 2020. Although the megathrust has produced great earthquakes both east and west of here, this part is known as a "seismic gap".
Read more on my blog: earthquakeinsights.substack.com!
A M7.2 earthquake occurred offshore Alaska last night - the latest in a series of large quakes that started in 2020. Although the megathrust has produced great earthquakes both east and west of here, this part is known as a "seismic gap".
Read more on my blog: earthquakeinsights.substack.com!
The M 5.6 #earthquake south of Alaska occurred at the Shumagin gap, which according to research has not ruptured in over 3000 years. Two adjacent small pockets ruptured in 1938 and 1946. This region is a candidate for one of the next mega-thrust #earthquakes.
August 1, 2024 at 10:49 AM
The M 5.6 #earthquake south of Alaska occurred at the Shumagin gap, which according to research has not ruptured in over 3000 years. Two adjacent small pockets ruptured in 1938 and 1946. This region is a candidate for one of the next mega-thrust #earthquakes.
What’s a(nother) strike-slip event doing in Alaska’s subduction zone, in the Shumagin Island region? A new #SRL paper proposes a conjugate fault set in the subducting Pacific plate. ⚒️
buff.ly/AfxHMw1
buff.ly/AfxHMw1
August 25, 2026 at 3:00 AM
What’s a(nother) strike-slip event doing in Alaska’s subduction zone, in the Shumagin Island region? A new #SRL paper proposes a conjugate fault set in the subducting Pacific plate. ⚒️
buff.ly/AfxHMw1
buff.ly/AfxHMw1
In a new #SRL paper, scientists use deep learning to present a high-precision earthquake catalog of the Alaska Peninsula region. They found an abrupt change in slab dip in the Shumagin segment. ⚒️
pubs.geoscienceworld.org/ssa/srl/arti...
pubs.geoscienceworld.org/ssa/srl/arti...
October 30, 2025 at 3:00 AM
In a new #SRL paper, scientists use deep learning to present a high-precision earthquake catalog of the Alaska Peninsula region. They found an abrupt change in slab dip in the Shumagin segment. ⚒️
pubs.geoscienceworld.org/ssa/srl/arti...
pubs.geoscienceworld.org/ssa/srl/arti...
🌱🎨 From the new Plant Science Bulletin's #SciArt special issue 🎨🌱
The SciArt exhibition Wunderkammer: Boundaryless Plants showed imagery of artifacts collected during decades of floristic & plant community research on remote islands of #Alaska.
By Sandra Talbot
issuu.com/botanicalsoc... #Botany
The SciArt exhibition Wunderkammer: Boundaryless Plants showed imagery of artifacts collected during decades of floristic & plant community research on remote islands of #Alaska.
By Sandra Talbot
issuu.com/botanicalsoc... #Botany
May 20, 2024 at 5:25 PM
🌱🎨 From the new Plant Science Bulletin's #SciArt special issue 🎨🌱
The SciArt exhibition Wunderkammer: Boundaryless Plants showed imagery of artifacts collected during decades of floristic & plant community research on remote islands of #Alaska.
By Sandra Talbot
issuu.com/botanicalsoc... #Botany
The SciArt exhibition Wunderkammer: Boundaryless Plants showed imagery of artifacts collected during decades of floristic & plant community research on remote islands of #Alaska.
By Sandra Talbot
issuu.com/botanicalsoc... #Botany
#Cascadia last ruptured with an approx. M 9.0 #earthquake in 1700. Two smaller zones ruptured south of #Alaska in 1938 and in 1946 with the #Shumagin gap in-between.
August 5, 2024 at 10:43 AM
#Cascadia last ruptured with an approx. M 9.0 #earthquake in 1700. Two smaller zones ruptured south of #Alaska in 1938 and in 1946 with the #Shumagin gap in-between.
The 16 July 2025 Mw 7.3 Earthquake in Shumagin Islands: Another Intraplate Strike‐Slip Event Related to the Heterogeneous Coupling Distribution on Alaska Subduction Interface #SRL ⚒️
What’s a(nother) strike-slip event doing in Alaska’s subduction zone?
buff.ly/z1WUXiy
What’s a(nother) strike-slip event doing in Alaska’s subduction zone?
buff.ly/z1WUXiy
August 12, 2026 at 3:00 PM
The 16 July 2025 Mw 7.3 Earthquake in Shumagin Islands: Another Intraplate Strike‐Slip Event Related to the Heterogeneous Coupling Distribution on Alaska Subduction Interface #SRL ⚒️
What’s a(nother) strike-slip event doing in Alaska’s subduction zone?
buff.ly/z1WUXiy
What’s a(nother) strike-slip event doing in Alaska’s subduction zone?
buff.ly/z1WUXiy
29 July 2021 6:16 UT
Mw8.2 earthquake at the Alaska-Aleutian subduction zone, struck offshore Alaska Peninsula, USA. Only minor damage (far away from land) and a small tsunami. Bordering Shumagin gap and similar to the 1938 Mw8.2 EQ.
earthquake.usgs.gov/earthquakes/...
doi.org/10.1785/0120...
Mw8.2 earthquake at the Alaska-Aleutian subduction zone, struck offshore Alaska Peninsula, USA. Only minor damage (far away from land) and a small tsunami. Bordering Shumagin gap and similar to the 1938 Mw8.2 EQ.
earthquake.usgs.gov/earthquakes/...
doi.org/10.1785/0120...
July 29, 2025 at 1:28 PM
29 July 2021 6:16 UT
Mw8.2 earthquake at the Alaska-Aleutian subduction zone, struck offshore Alaska Peninsula, USA. Only minor damage (far away from land) and a small tsunami. Bordering Shumagin gap and similar to the 1938 Mw8.2 EQ.
earthquake.usgs.gov/earthquakes/...
doi.org/10.1785/0120...
Mw8.2 earthquake at the Alaska-Aleutian subduction zone, struck offshore Alaska Peninsula, USA. Only minor damage (far away from land) and a small tsunami. Bordering Shumagin gap and similar to the 1938 Mw8.2 EQ.
earthquake.usgs.gov/earthquakes/...
doi.org/10.1785/0120...
In a new #SRL paper, scientists explore a recent M7.3 strike-slip in Alaska’s Shumagin Islands — a region where one might instead expect subduction-related megathrust earthquakes. ⚒️
buff.ly/AfxHMw1
buff.ly/AfxHMw1
August 19, 2026 at 9:01 PM
In a new #SRL paper, scientists explore a recent M7.3 strike-slip in Alaska’s Shumagin Islands — a region where one might instead expect subduction-related megathrust earthquakes. ⚒️
buff.ly/AfxHMw1
buff.ly/AfxHMw1