How does Japan try to reduce the effects of earthquakes?
Japan tries to reduce the effects of earthquakes just like every other place with earthquakes. They try to build their buildings and houses to withstand earthquakes.
There are lots of reasons. To try to understand them. To find out more about what triggers them. To learn more about the tectonic plates. To try to learn how to accurately predict earthquakes. To help design buildings that will be better able to survive them. To find out more about our planet. All these and many other reasons lead scientists to studying earthquakes.