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The researchers detailed their findings in a paper published May 26 in the journal 
AGU Advances.
What causes deep-focus earthquakes?
Deep-focus earthquakes are earthquakes that occur between 185 and 435 miles below the Earth’s surface. First detected in the 1920s, these earthquakes continue to confound scientists to this day.
“The big problem that seismologists have faced is how it’s possible that we have these deep-focus earthquakes at all,” said co-author Lara Wagner.
Usually, earthquakes occur near the surface after stress builds up between two blocks of rock. When enough stress has accumulated, it causes this pair of rocks to suddenly slip and slide past each other, triggering earthquakes. ....

Clara Wagner , University Of Alberta , Carnegie Institute For Science , Natural News , Carnegie Institute , San Andreas , Natural Disasters , Deep Focus Earthquakes , Earth Science , Earths Mantle , Natural Disaster , Real Science , Tectonic Plates , லாரா வாக்னர் , பல்கலைக்கழகம் ஆஃப் ஆல்பர்ட்டா , கார்னகி நிறுவனம் க்கு அறிவியல் , இயற்கை செய்தி , கார்னகி நிறுவனம் , சான் ஆண்ட்ரியாஸ் , இயற்கை பேரழிவுகள் , பூமி அறிவியல் , இயற்கை பேரழிவு , ரியல் அறிவியல் ,