maile ta more than 6 richter scale ko earthquake every 80 years ma repeat huncha bhanya ta more than 8 richter scale po rahechaa. It is really dangerous. Last time we had more than 8 richter scale was in 1990 BS. so, 1990 +80 = 2070 BS we are almost in 2064 BS. So we can have really devastating earthquake in next 6 years of over 8 richter scale.