One question daily to plate tectonics

 One question(though there are many) to plate Tectonics 

The tidal pull and hence planetary alignment are main cause of major quakes

They are the cause and trigger both.

One simple question (though there are many) to plate tectonics is...

...The plate tectonics says the plate movements built up stress on plate boundaries and when the stress exceed it releases them with movements/slide etc

Now the question is...at some prone location say at PNG or Tonga there are 6+quakes frequently,may be every alternate day.

Does it mean the plate boundaries built up stresses every alternate day? ( which takes centuries to built up normally)

 There are few more questions to plate tectonics. 

One question will be asked daily for Seismologist to answer