Mag 3.4 Earthquake under Lake Ontario, 15 km SW of Henderson, New York

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SUMMARY

The 3.4 magnitude earthquake occurred on June 29, 2024, at 03:45:24 UTC, located 15 km southwest of Henderson, New York, at a depth of 10.0 km. The earthquake is classified as low to moderate in magnitude, and while there was speculation about a tsunami, experts clarified that any resulting waves would be categorized as a seiche, a series of standing waves in enclosed bodies of water. The discussion also highlighted the absence of subduction fault involvement and introduced the term "meteotsunami" in relation to meteorologically driven waves.

PREREQUISITES
  • Understanding of earthquake magnitude scales, specifically the Richter scale.
  • Knowledge of seiche phenomena and their causes.
  • Familiarity with geological structures such as the Frontenac Arch.
  • Awareness of tsunami and meteotsunami definitions and distinctions.
NEXT STEPS
  • Research the geological characteristics of the Frontenac Arch.
  • Learn about the mechanics of seiches and their implications for lake safety.
  • Investigate the differences between tsunamis and meteotsunamis.
  • Explore the USGS earthquake event page for real-time data and analysis.
USEFUL FOR

Geologists, emergency preparedness professionals, and residents in seismically active regions, particularly those near large bodies of water like the Great Lakes.

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Wow.
A possibility of a tsunami in a great lake?
 
BillTre said:
A possibility of a tsunami in a great lake?
I don't believe so. The magnitude of the earthquake 3.4 was rather low to moderate, even though it appears to be shallow. I think any wave or waves would be referred to as a seiche. A seiche (pronounced "saysh") is a series of standing waves in a fully, or partially-enclosed body of water caused by earthquakes or landslides.
https://kingcounty.gov/en/dept/exec...vention/emergency-preparedness/tsunami-seiche
https://oceanservice.noaa.gov/facts/seiche.html

I was looking for further information on the type of fault. I don't believe subduction was involved.
https://earthquake.usgs.gov/earthquakes/eventpage/us6000n92y/region-info

We now see the term meteotsunami used in relation to meteorological driven waves or seishes.
https://www.ijc.org/en/they-come-waves-seiches-and-type-tsunami-affect-great-lakes
 
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The epicentre of the quake is just west of the Frontenac Arch, a basement structural rise. Might still be some residual stress relief occurring there.
 
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