Earthquakes

Earthquakes are not common in Vermont, but they do happen here.  Since 1997 the Geological Survey has partnered with DEMHS, UVM, FEMA, Norwich University, NESEC and others to conduct studies and outreach which serve to inform Vermonters and assist with emergency preparedness.  Completed projects include site class, amplification and liquefaction hazard maps, seismic vulnerability of critical facilities, HAZUS damage assessments, and outreach to local government, private engineering firms and the general public. The State Geologist serves as one of the national Earthquake Program Managers.  June 30, 2017 earthquake report (USGS)

Earthquake FAQS

What is an earthquake? It is sudden shaking of the earth caused by shifting of rock beneath the surface.

Where do earthquakes occur? 98% of earthquakes occur at plate boundaries; in the US, most occur west of the Rocky Mountains.

What are the largest events centered in Vermont?

Largest events centered in Vermont
date time lat (n) long (W) mag. mmi epicenter
04/10/1962 9:30 am 44.11 72.97 4.1 V Middlebury, VT
07/06/1943 5:10 pm 44.84 73.03 4.1 IV Swanton, VT
03/31/1953 7:59 am 43.07 73.00 4.0 V Brandon, VT

What should people do during an earthquake?  "Drop, Cover and Hold On!"
You may notice gentle shaking, swaying of plants, or rattling of windows. Most injuries are caused by flying glass, broken chimneys or fire from ruptured gas lines and downed power lines. There is usually an aftershock.

Town and Quadrangle Seismic Hazard Projects in Vermont:
Seismic site class, amplification and liquefeaction hazard mapping for the Burlington and Colchester VT 7.5 minutes quadrangles, 2011

Seismic hazard for the Burlington and Colchester, Vermont 7 1/2 minute quadrangles, 2013, VGS Open File Report VG13-3

Report on the comparison of shear wave velocities....for the Burlington and Colchester Vermont 7.5 minute quadrangles, 2013, VGTR 13-1

Seismic hazard mapping for Williston, VT, 2013, VGS open File Report VG13-4

Seismic screening and analysis of selected critical facilities in Vermont utilizing two FEMA methodologies (HAZUS and ROVER), 2016, NESEC Report 

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Vermont Geological Survey

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