Related Experiment Video
Updated: Jul 11, 2026

09:18
Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
Published on: December 14, 2017
Nuclear explosions and distant earthquakes: a search for correlations.
Summary
A previous apparent link between nuclear explosions and earthquakes from 1961-1966 was not found in later data (1966-1968). The study found no relationship between nuclear test size and distant earthquake occurrences.
Area of Science:
- Geophysics
- Seismology
- Nuclear Testing
Background:
- Previous research suggested a correlation between nuclear explosions and seismic activity between 1961 and 1966.
- This potential link warranted further investigation to confirm or refute the association.
Purpose of the Study:
- To re-examine the relationship between nuclear explosions and earthquakes using updated data.
- To determine if the previously observed correlation persisted over time.
Main Methods:
- Analysis of seismic event data, specifically focusing on the period from September 1966 to December 1968.
- Comparison of earthquake occurrences with records of nuclear explosion events.
Main Results:
- The apparent correlation between nuclear explosions and earthquakes observed in earlier data (1961-1966) was not present in the later dataset (1966-1968).
- No statistically significant relationship was found between the magnitude of nuclear explosions and the frequency of distant earthquakes.
Conclusions:
- The findings suggest that the previously reported correlation between nuclear explosions and earthquakes was likely coincidental or specific to the earlier time period.
- Further research may be needed to fully understand the complex interactions between large-scale man-made events and natural seismic phenomena.
Related Concept Videos
Nuclear Fission
Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large number of different...
Nuclear Stability
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
To hold positively charged protons together in the...
Nuclear Fusion
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
Nuclear Binding Energy
The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons are bound together;...
Atomic Nuclei: Nuclear Relaxation Processes
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis. This...
Nuclear Transmutation
Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...

