About Us

Terra-Mechanics, Inc. is a family owned  and operated certified SBE/WBE (PA SBE Certification No. 379916-2023-05-5B/ PA UCP No. 13748, OHIO UCP NAICS Code 541690) whose principals have a combined 50 years of experience in the vibration and sound monitoring industry. Because TMI maintains a low overhead, they are able to pass this savings on and provide a more personalized service directed toward their client’s satisfaction on every project.

From top to bottom: Dave Harrison, Betsy Harrison – Allegheny River Bridge Pier Demolition, Remote Monitoring – Harmar Township, PA  Brian Harrison -Setting up a Remote Seismograph for Pile Driving Operations


Dave Harrison



about 4

Betsy Harrison


Bob the builder

Brian Harrison



 Our Business

Terra-Mechanics, Inc. prides itself on effective public relations through education and listening to the concerns of the homeowners and contractors alike. TMI has conducted hundreds of public meetings and thousands of one-on-one inspections with concerned property owners,  striving to answer questions and address problems – and diffusing potentially explosive situations.


Dave Harrison and Vince Papale of the Philadelphia Eagles