I thought the mention of 1,000-3,000 aftershocks in NZ was scary, but take a look at this situation. See: Italy’s Zone of Endless Shaking.
The Oct. 30 quake was catastrophic, but hardly a one-off event. Since Aug. 24, the broader area has endured some 28,500 earthquakes and aftershocks, with at least 47 above 4.0 magnitude. Some have cracked buildings; some have merely rattled dishes in cupboards. Others have not been felt at all. But every day the earth is still moving.