Sometimes, earthquakes
occur in swarms which is perfectly normal.
Seriously, we are watching seismic activity for just a bit over 100 years now. This is
nothing in our planet's history and certainly, a time span of 100 years is not enough to deduce trends or predict future developments about seismic activity. What we are recently seeing and reading about earthquakes on various media outlets is just the usual uninformed media hype.
The quake in Spain was noteworthy for it's shallow epicenter with a focal depth of just about 1km (less than a mile) which is one of the reasons why it produced unusual strong surface shaking for a quake of this magnitude. It also occurred in the middle of a densely populated area.