Parts of Japan rocked by four earthquakes

Portions of Japan were hit by four earthquakes on Feb 25th, somewhat mild tremors with magnitudes ranging from 6.2 to 4.5, shaking Tokyo buildings but causing no injures.

Authorities issued no tsunami warning after the earthquakes took place, wrote UPI, which added that train service in Tochigi prefecture was temporarily halted after the 6.2 magnitude quake hit.

Read more from GlobalPost: Strong earthquake hits Hokkaido

Tokyo Electric Power Co reported no issues at its nuclear facilities, including the infamous Fukushima Daiichi plant, reports Stuff.co.nz.

Three of the quakes had their epicenters in Honshu province, says UPI, while the largest 6.2 magnitude quake took place in Tochigi prefecture.

CNN reported that its Tokyo bureau "felt a slight shake" during the temblor.

Earlier in the month, the Japanese island of Hokkaido was rocked by an unexpected 6.9 magnitude earthquake, although the quake caused no damage or injuries.

Why does Japan have so many earthquakes?

The Pacific island nation lies close to a convergent boundary, where two tectonic plates are colliding with one another, writes the Royal Geographical Society – meaning that Japan is particularly prone to subduction zone quakes, which occur when one of the plates "slips."