How many earthquakes happen in one minute?

yes there are earthequakes occuring every single minute or even every couple of seconds ,there are earthquakes that you can't even feel and probably wont even know about which do not cause any damage , however there are earthquakes that are average wich cause a bit of damage .Also earthquakes such as the one that occured in Japan a couple of years ago cause hell lot of damage as you probably would know ,but dont worry as them earthquakes dont happen often.