Hi Ara. If your interests are earthquake swarms then you may find this interesting.

The earthquake swarm near Izu Island is called a “super-swarm.” Have no idea as what the threshold is to become a “super-swarm.” Take Care…Don in creepy town

In the super-swarm of earthquakes the authors studied, a staccato-like burst of 7,000 magnitude-3 or larger shocks occurred over 2 months about 100 miles south of Tokyo, underneath the Pacific Ocean. There were 45 magnitude-5 shocks and 5 magnitude-6 shocks.

• Super-Swarm