I have an app that links to all earthquakes reordered worldwide from 2 up to 10. This whole area for at least a year has had tens of thousands of earthquakes. There is an area off the top of New Zealand which is constantly registering and Tonga is in a direct line. If you look at a map that gives the seabed, around Tonga there are many peaks that resemble volcanoes and probably are. The area is called the Pacific Ring of Fire. There definitely has been an uptick in earthquakes worldwide, even in areas that haven’t had one recorded.