Observations of seismicity and ground motion in the northeast U.S. Atlantic margin from ocean bottom seismometer data

Seismological Research Letters
By: , and 

Links

Abstract

Earthquake data from two short-period ocean-bottom seismometer (OBS) networks deployed for over a year on the continental slope off New York and southern New England were used to evaluate seismicity and ground motions along the continental margin. Our OBS networks located only one earthquake of Mc∼1.5 near the shelf edge during six months of recording, suggesting that seismic activity (MLg>3.0) of the margin as far as 150–200 km offshore is probably successfully monitored by land stations without the need for OBS deployments. The spectral acceleration from two local earthquakes recorded by the OBS was found to be generally similar to the acceleration from these earthquakes recorded at several seismic stations on land and to hybrid empirical acceleration relationships for eastern North America. Therefore, the seismic attenuation used for eastern North America can be extended in this region at least to the continental slope. However, additional offshore studies are needed to verify these preliminary conclusions.

Study Area

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Observations of seismicity and ground motion in the northeast U.S. Atlantic margin from ocean bottom seismometer data
Series title Seismological Research Letters
DOI 10.1785/0220160079
Volume 88
Issue 1
Year Published 2017
Language English
Publisher Seismological Society of America
Contributing office(s) Woods Hole Coastal and Marine Science Center
Description 9 p.
First page 23
Last page 31
Country United States