Big Quakes can Trigger Big Quakes on opposite side of Earth


Alex Wierbinski's picture

By Alex Wierbinski - Posted on 03 August 2018

GEOLOGY NEWS

Bi-Polar Quakes

Research finds quakes can systematically trigger other ones on opposite side of Earth,
Oregon State University, August 2, 2018.

"New research shows that a big earthquake can not only cause other quakes, but large ones, and on the opposite side of the Earth."

"...looked at 44 years of seismic data and found clear evidence that temblors of magnitude 6.5 or larger trigger other quakes of magnitude 5.0 or larger."

"It had been thought that aftershocks – smaller magnitude quakes that occur in the same region as the initial quake as the surrounding crust adjusts after the fault perturbation – and smaller earthquakes at great distances – were the main global effects of very large earthquakes."

"...analysis of seismic data from 1973 through 2016 – an analysis that excluded data from aftershock zones – using larger time windows than in previous studies, provided discernible evidence that in the three days following one large quake, other earthquakes were more likely to occur."

"A tremblor is most likely to induce another quake within 30 degrees of the original quake’s antipode – the point directly opposite it on the other side of the globe."

“The understanding of the mechanics of how one earthquake could initiate another while being widely separated in distance and time is still largely speculative.”

"The largest recorded earthquake was a 1960 temblor in Chile that measured 9.5. The 2011 quake that ravaged the Fukushima nuclear power plant in Japan measured 9.0."

"In 1700, an approximate magnitude 9.0 earthquake hit the Cascadia Subduction Zone – a fault that stretches along the West Coast of North American from British Columbia to California."

 

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