Can we determine the NK nuclear detonation strength?

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SUMMARY

The recent North Korean nuclear detonation has been reported with varying magnitudes: 4.9 by news outlets and 5.1 by the USGS, with the depth of the event currently uncertain. The USGS link provides further details on the seismic event. Historical context indicates that determining the exact strength of nuclear detonations is complex due to numerous variables, as noted by seismologists. Rough estimates suggest that a magnitude of 5.0 corresponds to approximately 0.5 kilotons of energy, but this figure may not accurately reflect the actual energy release.

PREREQUISITES
  • Understanding of seismic magnitude scales, particularly the Richter scale.
  • Familiarity with nuclear detonation energy equivalencies.
  • Knowledge of seismic event reporting and data sources, such as USGS.
  • Basic principles of seismology and energy transfer in geological events.
NEXT STEPS
  • Research the differences between the Richter scale and moment magnitude scale for seismic events.
  • Explore the methodologies used by USGS for measuring and reporting seismic events.
  • Investigate the historical context of nuclear tests and their seismic signatures.
  • Learn about the energy release calculations associated with nuclear detonations.
USEFUL FOR

Seismologists, nuclear physicists, researchers in geophysics, and anyone interested in the implications of nuclear testing on seismic activity.

mkarger
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I asked similar question back in nineties, when French did their last nuclear test. The short answer I got - from some seismologist - was "no". Too many variables.

I suppose some rough estimates on minimum and maximum value are possible. Wikipedia page on Richter scale gives something in the range of 0.5kT as an equivalent (in terms of amount of energy) of 5.0. But it is not even clear to me if the magnitude given is on the Richter scale, plus it is unlikely that all energy was used to shake the ground, so I doubt it is even a reasonable low estimate.
 

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