Jeri Jones of Jones Geological Services is often mentioned in media accounts of the Dillsburg earthquakes. His company's website has a piece on the Dillsburg series of small events on its web page, mostly focused on the activity last Fall. The isoseismal map contours values of Modified Mercalli intensity from the magnitude 2.1 earthquake of October 19, 2008.
Jones poses the following question:
What makes this swarm of shallow earthquakes interesting to investigate?
- The number of tremors felt over the last ten weeks
- The regular “boom” that accompanies many of these tremors
- A sulfur smell associated with the larger tremors and sometimes within the groundwater