Intensity map and felt area for the 1882 earthquake

Intensity map and felt area for the 1882 earthquake. The dashed lines indicate zones of different levels of shaking.
The shaded oval on the map is is the felt area of the largest after-shock.
This after shock was used to pinpoint the likely location of the main shock, plus or minus 50 km.

From the USGS's Earthquake Hazards web site