What is man made earthquake?

Answer 1

A man made earthquake is an earthquake which is created by man. There are many ways man can cause earthquakes like,

Build a Dam: Water is heavier than air, so when the valley behind a dam is filled, the crust underneath the water experiences a massive change in stress load. For example, the Hoover Dam area experienced hundreds of quakes as Lake Mead filled.

Inject Liquid Into the Ground: In 1961, the Army decided that the best way to dispose of toxic waste from napalm production (among other things) was to drill a 12,000-foot-deep well in the Rocky Mountains and inject the bad stuff down it into the crust of the Earth. From 1962 to 1966, the Army deposited 165 million gallons of toxic waste into this hole in the Earth. Unfortunately, the injections probably triggered earthquakes in the region.

Mine a Lot of Coal: Coal provides more than half the electricity in the United States and an even greater percentage in China. That means there are a lot of coal mines working overtime to pull the fossilized fuel out of the Earth. In total, miners pulled 6,195 million metric tons of coal out of the Earth in 2006 alone. And coal mines often have to pump water out along with the coal, sometimes extracting dozens of times as much water as coal. Add it up and you have a huge change in the mass of a region, and huge mass changes re figure the earthquake stresses of an area, sometimes increasing the chance of an earthquake and other times lowering it.

Drill a Gusher Dry: Three of the largest human-caused quakes occurred near a natural-gas field in Uzbekistan, the Gazli. The combination of liquid extraction and injection changed the tectonic action in the field. The biggest of the trio registered as a 7.3. According to a major analysis by Russian scientists, "Few will deny that there is a relationship between hydrocarbon recovery and seismic activity, but exactly how strong a relationship exists has yet to be determined." They caution that in regions where tectonic activity is already high, extracting oil and natural gas could trigger strong quakes.

Create some of the Biggest Buildings: Back in 2005, a geologist claimed that the world's then-tallest building, the Taipei 101, which weighs in at more than 700,000 metric tons, was triggering earthquakes in a long-dormant fault in Taiwan.