Perhaps more interesting earthquake news is that a couple of these larger shocks hit the internal areas of the USA, in the middle of the North America, that had not recently had such large tremors.
Earthquakes where tectonic plates meet are understandable, from a geology point of view, but how and why do you get earthquakes in the middle of tectonic plates.
How and what are intraplate earthquakes? How do you get large intraplate earthquakes?
While the number of large earthquakes fell to 12 in 2014, from 19 in 2013, several moderate temblors hit areas relatively new to seismicity, including Oklahoma and Kansas, according to the U.S. Geological Survey. Worldwide, 11 earthquakes reached magnitude 7.0-7.9 and one registered magnitude 8.2, in Iquique, Chile, on April 1. This is the lowest annual total of earthquakes magnitude 7.0 or greater since 2008, which also had 12.
Fewer Large Earthquakes in 2014
Large intraplate earthquake theories
Most of the world’s earthquakes happen at so-called plate boundaries – parts of the planet where tectonic plates are pushing against one another – and about 80 per cent occur around the edge of the Pacific Plate (the ‘Rim of Fire’), affecting New Zealand, Japan, the west coast of North and South America and New Guinea.
Earthquakes in Australia
But how and why would Australia seem to have more earthquakes than areas where the plates meet and collide?
Why do States like Oklahoma and Kansas have so many microquakes and other earthquakes?
However, plate tectonic motions do not readily account for earthquakes located within the interiors of oceanic and continental plates. These “intraplate” earthquakes present fundamental challenges to understanding how strain accumulates and what the associated seismic potential and hazard are for intraplate regions. For example, large areas of Australia, North America, Asia, and Europe experience intraplate earthquakes, some of which are catastrophically large.
… The existence of intraplate earthquakes remains a deep scientific mystery with strong societal implications that needs to be solved by innovative approaches.
Intraplate Earthquakes | Incorporated Research Institutions for Seismology
Large intraplate electric earthquakes?
Are earthquakes electric? Animals seem to be able to know and sense when a natural disaster is coming a few hours or days before it happens. If an earthquake is an electromagnetic effect would they sense it that way?
Could electric earthquakes help explain intraplate earthquakes?
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