Spring-pendulum seismometers were used before electronics were able to measure the size of earthquakes. A medium-sized spring-pendulum seismometer, about three stories tall, is located in Mexico City, Mexico and is still in use. But history of earthquakes is older; exists since from the beginning of mankind. Almost every year we hear together how this planet moves, shaking up, shifting and killed thousand of lives on top of it. An earthquake is unpredictable.
It comes often with no warning. Some earthquake collaborate with Tsunami and that makes his killing score rise up to hundreds of thousands lives. There are approximately a half million detectable earthquakes each year. Of the 500,000 earthquakes, only about 100,000 can be felt. But, only about 100 of them can cause damage. In order to become more familiar with this deadly act of nature I have put together a list of interesting facts many people wouldn’t know about.
