Question

What are natural causes of earthquakes that is what are the tectonic features and actions that result in seismic waves?

Answer 1

Anearthquake is what happens when two blocks of the earth suddenly slip past one another. The surface where they slip is called the fault.
or

An earthquake is the result of a sudden release of stored energy in the Earth's crust that creates seismic waves.

Earthquakes are accordingly measured with a seismometer, commonly known as a seismograph.

The magnitude of an earthquake is conventionally reported using the Richter scale or a related Moment scale 





An earthquake is caused by tectonic plates getting stuck and putting a strain on the ground.

The strain becomes so great that rocks give way by breaking and sliding along fault planes.

Earthquakes may occur naturally or as a result of human activities.

Smaller earthquakes can also be caused by volcanic activity, landslides, mine blasts, and nuclear experiments.

Answer 2

I know that if there was an earthquake (oceanic plates moving) in the sea there would be a force outward from the centrepoint and the ripples out would get bigger and bigger the smaller waves behind the first is like fuel and cause a tsunami. I hope this helps you or at less gives you a better Idea as to what the answer is.