M 7.3 - 2025 Sand Point, Alaska Earthquake, 16 July, 2025

  • Thread starter Thread starter Astronuc
  • Start date Start date
Click For Summary

Discussion Overview

The discussion revolves around the M 7.3 earthquake that occurred in Sand Point, Alaska, on July 16, 2025. Participants explore the seismic wave measurements and potential effects experienced in various locations, particularly in the continental US and as far as Australia.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant notes the strong earthquake in the Aleutian Island chain and highlights the seismic wave measurements traveling through the continental US.
  • Another participant questions whether they can deduce the effects of the earthquake experienced in Southern Ontario, suggesting a curiosity about local impacts.
  • A different participant responds that any effects would likely be unnoticeable amid everyday noise, indicating a belief that the earthquake's impact would not be felt by individuals.
  • Further, a participant asserts that the earthquake would be completely unnoticeable to a person, only detectable by sensitive seismic recorders due to the distance from the "lower 48" states.
  • Another participant shares a personal recording of the earthquake from their seismograph in Sydney, Australia, indicating that the event was recorded even at great distances.

Areas of Agreement / Disagreement

Participants express differing views on the perceptibility of the earthquake's effects in various locations. While some believe it would be unnoticeable to individuals, others are curious about the potential for local effects, indicating that the discussion remains unresolved regarding the extent of perceptible impacts.

Contextual Notes

Participants do not provide specific details on the assumptions underlying their claims about perceptibility or the sensitivity of seismic instruments, leaving some aspects of the discussion open to interpretation.

Who May Find This Useful

Individuals interested in seismology, earthquake effects, and seismic wave propagation may find this discussion relevant.

Astronuc
Staff Emeritus
Science Advisor
Gold Member
2025 Award
Messages
22,515
Reaction score
7,461
Very strong earthquake in the Aleutian Island chain
https://earthquake.usgs.gov/earthquakes/eventpage/us7000qd1y/executive

M 7.3 - 2025 Sand Point, Alaska Earthquake​

  • 2025-07-16 20:37:39 (UTC)
  • 54.549°N 160.472°W
  • 20.1 km depth

What's interesting about this particular earthquake is the measurements of seismic waves traveling through the continental US.
https://ds.iris.edu/spud/gmv/23319759

I've not seen that before, but presumably similar measurements are made for other earthquakes.

https://www.earthscope.org/geophysical-event/m-7-3-sand-point-alaska-us7000qd1y/
 
Earth sciences news on Phys.org
It looks like it passed through S. Ontario around 4:37PM local time Monday.

Am I able to deduce what effects, if any, we ought to have experienced here?
 
DaveC426913 said:
Am I able to deduce what effects, if any, we ought to have experienced here?
It would probably be unnoticeable among all the other 'noise' from normal, everyday activities, e.g., transportation.
 
DaveC426913 said:
Am I able to deduce what effects, if any, we ought to have experienced here?

completely unnoticeable by a person, regardless of background noise levels, only recordable on sensitive seismic recorders.
It was just too far from the "lower48" to be felt by a person

Dave
 
this was my recording of it, on my seismo, here in Sydney, Australia.

1753321651804.gif
 
Reply
  • Like
Likes   Reactions: DOGE3500

Similar threads

Mag 7.0 Earthquake, Hubbard Glacier, Alaska - British Columbia
  • · Replies 1 ·
Replies
1
Views
938
M7.6 Drake Passage; M7.4, M6.7 Philippines, M6.3 Papua New Guinea Earthquakes
  • · Replies 1 ·
Replies
1
Views
960
Mount Rainier - earthquake swarm July 2025
  • · Replies 2 ·
Replies
2
Views
880
M 7.4 - 2025 Drake Passage Earthquake - unusual
  • · Replies 3 ·
Replies
3
Views
3K
Earthquakes in Queensland, Mag 4.9, 5.6 - August 15
  • · Replies 5 ·
Replies
5
Views
741
M 7.2 - 98 km S of Sand Point, Alaska; Shishaldin Volcano erupting
  • · Replies 2 ·
Replies
2
Views
3K
Mag 8.2 Earthquake and aftershocks ~ 104 km SE of Perryville, Alaska
  • · Replies 5 ·
Replies
5
Views
2K
M6.8 Earthquake, 40 km SSW of Bartolomé Masó, Cuba
  • · Replies 2 ·
Replies
2
Views
3K
M 7.3 - 174 km NE of Gisborne, New Zealand
  • · Replies 28 ·
Replies
28
Views
3K
M 2.9 Earthquake, Lake Michigan, 39 km ESE of Sturgeon Bay, Wisconsin
  • · Replies 2 ·
Replies
2
Views
3K