Mag 6.0 - 76km S of Atka, Alaska and Swarm

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Discussion Overview

The discussion revolves around a series of earthquakes, including a Mag 6.0 event near Atka, Alaska, and its relationship to previous seismic activity in the region. Participants explore the nature of these earthquakes, their potential connections to past events, and the broader tectonic context, including volcanic activity.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants note that the Mag 6.0 earthquake was preceded by a Mag 5.0 and followed by several smaller quakes in the region.
  • Others argue that these earthquakes are ongoing aftershocks of a prior Mag 6.3 event that occurred a week earlier, which was itself preceded by foreshocks.
  • One participant raises the possibility of a larger earthquake occurring in the area in the future.
  • Another participant mentions a separate but related earthquake (M6.4) occurring near the Kuril-Kamchatka Trench, suggesting a connection to the tectonic boundary.
  • There is speculation about whether the recent earthquakes could be precursors to volcanic activity, although one participant expresses uncertainty about the geographical relationship between the events.
  • Another participant emphasizes that significant earthquakes do not necessarily lead to immediate volcanic eruptions, highlighting the long-term nature of subduction processes.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between the recent earthquakes and previous seismic activity, with some asserting a direct connection while others remain uncertain. The discussion does not reach a consensus on the implications of these events for future seismic or volcanic activity.

Contextual Notes

Participants acknowledge the complexity of the tectonic interactions in the region, including the influence of subduction zones on both earthquakes and volcanism. There are unresolved questions regarding the specific relationships between the earthquakes and the potential for volcanic activity.

Astronuc
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There is a swarm of earthquakes in the area. It was lead off by a Mag 5.0, which was followed by the Mag 6.0.

http://earthquake.usgs.gov/earthquakes/eventpage/us20005axu#general_region

2016-03-19 01:35:12 (UTC)
Location: Lat. 51.513 °N, Long. 174.234 °W
Depth: 17.0 km (10.6 mi)

http://earthquake.usgs.gov/earthquakes/eventpage/us20005axl#general_region
The Mag 5.0 occurred 2016-03-19 01:22:16 (UTC)
Location: Lat. 51.380 °N, Long. 174.265 °W
Depth: 10.0 km (6.2 mi)

There were a bunch of 4.0-4.9 in the region following the first two.
 
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Astronuc said:
There is a swarm of earthquakes in the area. It was lead off by a Mag 5.0, which was followed by the Mag 6.0.

actually these are just ongoing aftershocks to a M 6.3 just over a week ago :wink:
which was preceded by several foreshocks

M 6.3 - 71km S of Atka, Alaska

Time: 2016-03-12 18:06:45 UTC
Location: 51.561°N 174.027°W
Depth: 19.0 km

160220-0319 events S of Atka Aleutians.JPG
cheers
Dave
 
davenn said:
actually these are just ongoing aftershocks to a M 6.3 just over a week ago :wink:
which was preceded by several foreshocks

M 6.3 - 71km S of Atka, Alaska

Time: 2016-03-12 18:06:45 UTC
Location: 51.561°N 174.027°W
Depth: 19.0 km
Yeah - I had intended to mention that one. I got distracted this afternoon.

I wonder if we'll see a larger one in the region.
 
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Astronuc said:
Yeah - I had intended to mention that one. I got distracted this afternoon.

no probs, I just didn't know if you knew it was part of an earlier larger event
your text sort of indicated that you didn't :wink:
so posted just in case :smile:

Dave
 
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1oldman2 said:
I wonder if those quakes were a precursor to this event, seems likely but not sure of the locations being in the same area. any thoughts?
http://www.foxnews.com/us/2016/03/2...ding-ash-20000-feet-in-air.html?intcmp=hplnws

the quakes were way too far away, more than 700km.

when looking at quake related volcanism, particularly in island arcs, look more closely at the islands and volcanoes immediately behind the subduction zone where the quakes occurred
Always remember too, that in these situations, a big quake doesn't mean immediate/short term volcanism. It is the long term subduction of the seafloor plate that produces both the quakes and the volcanism, not the other way around. That is, quakes and volcanism are by-products of the subduction, not the cause of it.cheers
Dave
 
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