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Coastal residents started moving towards the higher ground when the powerful earthquake caused a series of tsunamis. This emerged concerns about the Fukushima nuclear power plant which was destroyed by a much larger/ violent/ stronger tsunami five years ago.
The magnitude of the earthquake was 7.4 that struck Japan at 6 am by the local time. And the regions were same to those of which were devastated by a tsunami in the year 2011 that had a much larger magnitude of 9.0.
But why so many earthquakes strike Japan? Is the country Japan vulnerable to such calamities? Come one, let's find about it.
To start with, Japan is located along the Pacific Ring of Fire which is certainly the most active belt of earthquake in the world.
This ring is an imaginary zone which is in the shape of a horseshoe, that follows the rim of the Pacific Ocean. And this is the area where many of the earthquakes and volcanoes in the world erupt.
The tectonic plates within this Ring of Fire which are beneath the Philippine Sea and the Pacific Ocean mash and collide.
"The Earth's surface is broken up into about a dozen or so major chunks that are all moving around. Where they all interact at their edges, interesting things happen."
First: The earthquake has to be of at least magnitude-7.
Second: The epicenter of the earthquake has to be underneath the ocean.
Third: The earthquake has to be shallow.
Japan recorded the earthquake of 7.0 magnitude to be the biggest but, the one which has struck on November 22, 2016, has broken all the records with a magnitude of 7.4.
The area of high volcanic and seismic activity ranges from New Zealand to Japan, through Alaska across the west coasts of North and South America.