From what I gathered on Twitter, there are some collapsed buildings and some power outages, probably a few people hurt, but nothing as devastating as during the 2007 earthquake in Ica.
This happened in the middle of the night and it's now early morning, so more news will probably come in over the next hours.
Yurimaguas and Tarapoto do have a sizeable population, but still, from what I heard so far the damage is nothing compared to the 2007 M8 quake that destroyed 85% of Pisco and killed many hundred people.
[1] https://earthquake.usgs.gov/earthquakes/browse/stats.php
From searching it seems an 8.0M earthquake is equivalent to a nuclear explosion of 6,270,000 tons of TNT but a 7.0M is 199,000 tons of TNT.
I live in Bogotá, Colombia, about 1200 kilometers away from the epicentre.