Seismicity in Japan refers to the frequency and intensity of earthquakes that occur in Japan. Japan is located in a very active geological region where several tectonic plates (like giant puzzle pieces that make up the Earth's crust) meet and interact with each other. These plates rub against each other and create pressure which eventually results in earthquakes.
Now imagine that you and your friends are standing on a trampoline and you are all jumping at different times and heights. Sometimes you might bump into each other and this creates a little shake on the trampoline. Similarly, the tectonic plates in Japan are constantly moving and bumping into each other, creating earthquakes.
Due to Japan's location and active geological features, earthquakes are very common there. The Japanese government is very aware of this and works hard to prepare for and respond to earthquakes. Buildings and infrastructure are designed to withstand earthquakes and citizens are regularly educated on what to do in case an earthquake occurs.
Despite all the precautions, earthquakes can still be very dangerous and have the potential to cause damage to buildings and harm people. Therefore, it is important to stay aware of seismicity in Japan and always be prepared for earthquakes.