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MARCH-APRIL 2022 | VOLUME 32, NUMBER 3–4
SCIENCE

4 The M w 5.1, 9 August 2020, Sparta Earthquake,
North Carolina: The First Documented Seismic
Surface Rupture in the Eastern United States
GSA TODAY (ISSN 1052-5173 USPS 0456-530) prints news Paula M. Figueiredo
and information for more than 22,000 GSA member readers
and subscribing libraries, with 11 monthly issues (March-
April is a combined issue). GSA TODAY is published by The Cover: Perspective of a section of the surface rupture of the 9 Aug.
Geological Society of America Inc. (GSA) with offices at
®
3300 Penrose Place, Boulder, Colorado, USA, and a mail- 2020 M 5.1 Sparta, North Carolina, USA, earthquake, looking south.
w
ing address of P.O. Box 9140, Boulder, CO 80301-9140, USA. Here, about 3 km eastward from downtown Sparta, along a north-
GSA provides this and other forums for the presentation facing slope, the rupture is expressed by reverse faulting, generating a
of diverse opinions and positions by scientists worldwide, linear scarp up to ~25 cm height. The southern block (hanging wall) is
regardless of race, citizenship, gender, sexual orientation,
religion, or political viewpoint. Opinions presented in this consistently uplifted. The vegetation was removed to study the scarp and to help with topographic
publication do not reflect official positions of the Society. and geophysical surveys. In the footwall, a backpack and a topography survey pole provide a scale
© 2022 The Geological Society of America Inc. All rights for the morphological feature. Photo by Paula Figueiredo, Sept. 2020. See related article, p. 4–11.
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