Scientists Confirm Rare Deep Earthquake Beneath Utah That Defies Geological Expectations
Researchers have confirmed that a 1979 Utah earthquake occurred nearly 90 kilometers underground, far deeper than continental earthquakes were thought possible. By reanalyzing decades of seismic data, scientists identified a rare class of 'continental mantle earthquakes' occurring in Earth's upper mantle. The finding challenges long-held assumptions about how rock behaves at extreme depths beneath continents.
A team of scientists has confirmed that a mysterious earthquake first detected in Utah in 1979 genuinely occurred at a depth of nearly 90 kilometers, placing it well within Earth's upper mantle. This is significant because rock at such depths beneath continents is generally expected to deform slowly and plastically rather than fracture suddenly in the manner required to produce an earthquake. By reanalyzing decades of accumulated seismic data, researchers were able to validate the anomalous event and classify it within a rare category now being called 'continental mantle earthquakes.' The discovery suggests that the conditions under which earthquakes can occur beneath continents may be broader than previously understood. Scientists believe further study of this class of events could reshape models of continental geology and seismic risk assessment.
What's missing
The specific mechanism that allows rock to fracture rather than flow at such depths beneath a continent remains unexplained in available coverage, and it is unclear whether other similar deep continental earthquakes have since been identified in the reanalysis.
How coverage differed
Only a single centrist source was available for this story, Science Daily, which framed the findings in straightforward scientific terms without notable political or ideological slant. No comparative framing across outlets could be assessed.
What different sources said
- Science DailyCenter
Scientists confirm a deep earthquake that shouldn't exist
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