Some of the world's largest and most deadly recent earthquakes were not natural disasters at all but were caused by human activities such as mining, reservoir construction and oil and gas extraction, scientists say.
A global study of hundreds of quakes by Christian Klose, a consultant geophysicist, identified 92 large earthquakes likely to have been caused by humans.
Klose said that the Earth's crust is littered with geological faults under enormous tensions similar to those in a coiled spring.
When humans pile up vast masses of water or minerals on the surface, or extract them from beneath, the change in the weight of the overlying land can be enough to release that geological tension, causing an earthquake.
"The data specifically shows that human-made mass changes can advance the clock of natural seismic cycles and induce or trigger new earthquakes," said Klose.
According to the research, the 2008 earthquake in Sichuan, China, which had a magnitude of 7.9 and killed 80,000 people, was triggered by the construction of the Zipingu reservoir.
http://www.indianexpress.com/news/humans-may-have-caused-world-s-worst-earthquakes/1207945/
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