I want to know if the delware earthquake was unusual?

Naw. Look up a map of all the fault lines in the US then you'll be like... "Ahh ok makes more sense now"

yes it was unusual, and a minor quake as well. Pretty well what you would expect anywhere on earth once in a while. Nowhere is immune. Lots of places are not at high risk of bad earthquakes though.

Delaware is not located along a plate boundary and it does not have much of a record in terms of Earthquakes, so it was pretty unusual.

Only on a human scale in the sense that we have short memories. There are small earthquakes on the US east coast all the time, but they're usually so small that they're barely felt if at all. Still, there were two that I felt during the time I lived in Maryland, though west coasters might barely have noticed the smaller of the two.

There's a map in this article showing fault lines in NJ as well as earthquakes since 1950, though not this latest one as the article is from 2010.

https://njmonthly.com/articles/jersey-living/living-on-the-fault-line/