This another one of those things that are destructive…Like Forest Fires…..
But in the end are simply natures way of getting things done….
And in the end are actually beneficial in a way…
On May 12, 2008, a powerful 7.9 magnitude earthquake struck the Wenchuan district of Sichuan province in south central China. It was the most powerful quake to hit China in at least 50 years, killing more than 69,000 people, creating thousands of orphans and leaving millions of people temporarily homeless.
Given the depth of the suffering, it verges on thoughtlessness to use the words “silver lining,” but a study in the latest Science has relied on the Wenchuan quake to add a small but possibly important clue to the mystery of why and how earthquakes happen. “Everyone who studies earthquakes would love to be able to predict them,” says Emily Brodsky, a seismologist at the University of California, Santa Cruz, and a co-author of the new study. “This is one piece of that.”
In this case, the piece wasn’t the quake itself, but the geological healing process that took place afterward. Like the great quakes that periodically rattle California’s San Andreas Fault, this one was triggered by a sudden, sideways slip of one huge slab of underground rock past another. Above ground, the energy released by this geological spasm was enough to shake the landscape for hundreds of miles in all directions and send buildings tumbling.
But down below, the quake also shattered rock on both sides of the fault itself, out to a distance of 1,000 ft. (304 m) or more, opening up a network of cracks. Over time, geologists have learned, those cracks gradually repair themselves. “We think it’s some combination of the rocks fusing back together,” says Brodsky, “along with water flowing through the cracks bearing minerals that crystallize. But we don’t really know.”
Forest fires actually burn off decaying vegetation and sparks new growth in the area’s effected….Share on Facebook