Pyrrhotite is a mineral found in bedrock under certain parts of Connecticut and Massachusetts. It can cause long-term structural weakness in construction when used in cement, the USGS says.

Pyrrhotite is a mineral found in bedrock under certain parts of Connecticut and Massachusetts. It can cause long-term structural weakness in construction when used in cement, the USGS says.

Mapping is another critical part of the Massachusetts Geological Survey. Before he ended his 22-year term as state geologist, Mabee published a updated bedrock map of the state.

The flights will image geology as part of a national effort to modernize geological maps in the region. The planes will take measurements over a large swath of central and western Massachusetts.

The quake was felt more than 100 miles away, in Connecticut, New Hampshire and Sound Beach, New York, on Long Island, the USGS says.

A minor earthquake shook parts of Massachusetts on Tuesday night, the United States Geological Survey reports.

The explosions destroyed the local vegetation, reshaped and lowered the landscape, remixed the soil-layers and fractured the underlying bedrock.

A 4.0 magnitude earthquake struck near Bliss Corner, Massachusetts, on Sunday morning, according to preliminary information from the US Geological Survey.

The U.S. Geological Survey says a 3.6-magnitude earthquake was recorded Sunday morning off the coast of Massachusetts.

Pyrrhotite is a mineral found in bedrock under certain parts of Connecticut and Massachusetts. It can cause long-term structural weakness in construction when used in cement, the USGS says.