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

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A significant earthquake measuring 7.3 occurred in the Aleutian Island chain near Sand Point, Alaska, on July 16, 2025, at a depth of 20.1 km. The seismic waves from this earthquake were detected across the continental United States, with notable measurements recorded in Southern Ontario around 4:37 PM local time. However, the effects of the earthquake were negligible for residents in the lower 48 states, as the tremors were too weak to be felt amidst typical background noise from daily activities. Sensitive seismic recorders were able to capture the event, but it remained unnoticeable to the general public. A participant shared their own seismic recording of the earthquake from Sydney, Australia, highlighting the global reach of the seismic waves.
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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/
 
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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
 

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