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

Claudia H. Flores, Uri S. ten Brink, Jeffrey J. McGuire and John A. Collins
Observations of seismicity and ground motion in the northeast U.S. Atlantic margin from ocean-bottom seismometer data
Seismological Research Letters (November 2016) 88 (1): 23-31

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 M (sub c) approximately 1.5 near the shelf edge during six months of recording, suggesting that seismic activity (M (sub Lg) >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. Electronic Supplement: Tables of ocean-bottom seismometer (OBS) locations with recording start and end times, list of earthquakes on land used to identify the detection limits of OBSs, and station information, figures of probability density functions (PDFs) and waveforms, and zip archive of waveform data.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 88
Serial Issue: 1
Title: Observations of seismicity and ground motion in the northeast U.S. Atlantic margin from ocean-bottom seismometer data
Affiliation: U. S. Geological Survey, Woods Hole Coastal and Marine Science Center, Woods Hole, MA, United States
Pages: 23-31
Published: 20161102
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 29
Accession Number: 2016-106793
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N41°00'00" - N47°30'00", W73°30'00" - W67°00'00"
Secondary Affiliation: Woods Hole Oceanographic Institution, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201651
Program Name: USGSOPNon-USGS publications with USGS authors
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