Geology

The Science of Sinkholes

Aug 22, 2015
Dave Fairburn via Facebook

This week a sinkhole in Interstate 93 near Concord prompted an emergency road closure and a major traffic jam. Despite the disruption it caused, the cavity doesn’t actually meet the definition of a sinkhole, but it maybe the sort of thing that the Granite State could see more of.

To answer how can a gaping hole suddenly appear in the ground, you need to start somewhere in the sky.

Bruce Lyndes / Plymouth State University

Last month, Fred Prince, a biology professor at Plymouth State University, found and confirmed the first woolly mammoth tooth on land in New Hampshire.

So the question is, what took so long - especially given that such teeth have already been found in Vermont and Maine?

NHPR / Michael Brindley

While New Hampshire may not be known for earthquakes, the town of Merrimack is now host to the Granite State’s first seismograph available for public use.

Library Director Yvette Couser got her introduction to earthquakes about two years ago.

A rare 4.0 magnitude earthquake rattled New England, last night. While some of our readers on the West Coast would barely even blink with such a shake, it caused confusion and consternation for many around the epicenter about 30 miles outside of Portland, Maine.

The Bangor Daily News reports that the largest earthquake to strike the region measured 5.1 and it happened in 1904.

Quake Hits Maine, Rattles N.H.

Oct 16, 2012
USGS ShakeMap / U.S. Geological Survey

An earthquake has struck southern Maine and rattled nearby New England states.

The U.S. Geological Survey  said the epicenter of the quake was about 3 miles west of Hollis Center, Maine, and about 3 miles deep. That location is about 20 miles west of Portland.

The quake was felt in Vermont, New Hampshire and Massachusetts, including Boston, and as far south as Rhode Island and Connecticut.

Postcard from the Rock Swap

Jun 27, 2006
Ian Junor

Over the weekend, hundreds of people from around the world showed up in the town of Gilsum, in southwest New Hampshire.