WASHINGTON: Scientists have found out the mechanism that produces earthquakes that happen away from tectonic plate boundaries. Researchers have discovered while earthquakes situated at tectonic plate boundaries are due to movement between the plates, earthquakes at distances from fault lines are mainly caused by a movement below the plates.
Even though intraplate quakes account for a tiny amount of overall earthquakes (around 98% of earthquakes happen at the tectonic plates’ boundaries), they have been measured with strengths up to 7 magnitude. Also, they are dangerous as well as destructive because of their unexpected nature.
For instance, human habitats affected by intraplate earthquakes may lack earthquake-prepared infrastructure compared to the habitats that are located on plate boundaries.
Just below our planet’s crust exists a layer of hot, semi-fluid rock that is constantly flowing, getting heated and rising followed by cooling and sinking.
Convective activity causes intraplate seismicity, interacting with the perennially changing movement of the plates at the surface. The activity also determines the occurrence of the earthquakes to a large degree. As per their models, the crust structure above also affects the location to a lesser degree.
Lead author and professor of Earth sciences, Thorsten Becker opined that presently all is not known about how strange earthquakes happen. However, their work demonstrates that how imaging advances in the area of seismology along with mantle flow modeling can discover the connections between mantle convection and seismicity.
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