Ground shaking is caused by an earthquake which is two tectonic plates that rub against eachother or overlap

The magnitude of most earthquakes is measured on a ricture scale the magnitude is calculated by the ampline.

P waves are also faster than S waves, and this fact is what allows us to tell where an earthquake was. To understand how this works, let's compare P and S waves to lightning and thunder. Light travels faster than sound, so during a thunderstorm you will first see the lightning and then you will hear the thunder. If you are close to the lightning, the thunder will boom right after the lightning, but if you are far away from the lightning, you can count several seconds before you hear the thunder. The further you are from the storm, the longer it will take between the lightning and the thunder.

P waves are like the lightning, and S waves are like the thunder. The P waves travel faster and shake the ground where you are first. Then the S waves follow and shake the ground also. If you are close to the earthquake, the P and S wave will come one right after the other, but if you are far away, there will be more time between the two.

There is 15 tunnels

86 km or 54 miles from Christchurch Airport to Akaroa

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Christchurch Priory in Dorset, England was founded in the early 12th century, around 1094. The priory was originally an Augustinian foundation before becoming Benedictine in the 13th century.