Two million "hidden" earthquake hit California!

Two million "hidden" earthquake hit California!

A series of data revealed that South California has seen nearly two million earthquakes since 2008.

The region is home to the dangerous San Andreas fault, and is regularly monitored for signs of tectonic movement and seismic activity.

California scientists collected a wide range of data, found a total of 1.81 million earthquakes, equivalent to 495 a day, and one every 174 seconds.

Previous estimates said there were only 180,000 recorded earthquakes, equivalent to one earthquake every 30 minutes.

The increase comes as a result of a study published in the journal Science by researchers at the California Institute of Technology.

The study focused on the oscillations between the measures of: -2 and 1.7, to obtain a better measure of the activity of the region. These tremors are too small to be detected in the noise of seismic data, such as traffic jams or building construction.

The researchers decoded the earthquake signals from the background noise, using a method known as "template matching".

The largest earthquake is used as a template to provide markers and switches, easily recognizable to a smaller event expectation at a given location. Additional investigations were performed using close sensors, before being added to the list.

The study comes as the region celebrates 113 years since the earthquake that devastated northern California on April 18, 1906.

The devastating 7.9-magnitude earthquake caused severe damage and lasted one minute.

Now seismic sensors are distributed throughout California, earthquake-resistant buildings have been built, in addition to a large number of systems and detectors, to avoid a potential risk to life due to an imminent earthquake.