<div dir="ltr"><div><div class="gmail_signature"><div dir="ltr"><div dir="ltr"><p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="color:black;font-size:10pt">Dear colleagues:</span><br></p>

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We encourage those of you conducting related research to submit an abstract
for <b><i>Topical Session T223. Intraplate Earthquake Sources,
Processes, and Hazards in Central and Eastern North America</i></b> at the
Geological Society of America (GSA) Annual Meeting, 22-25 October, 2017, in Seattle,
Washington, USA. The session will include invited keynote talks by Eric Calais
(Ecole Normale Supérieure, PSL Research University, France), Maureen Long (Yale
University), and Stephen Marshak (University of Illinois at Urbana-Champaign). It
is sponsored by four GSA Divisions (Structural Geology and Tectonics,
Geophysics, Environmental and Engineering Geology, Quaternary Geology and
Geomorphology), and the EarthScope National Office. Depending on the number of
abstracts submitted, a parallel poster session in addition to the oral session may
be included.<span></span></span></p>

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<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">Rationale: The processes
leading to intraplate earthquakes and zones of historical seismicity in central
and eastern North America are poorly understood because earthquake rates are
relatively low, surface expression can be subtle to non-existent, and active
faults can be hidden beneath the surface or episodic in behavior. Yet the
region has major population centers in moderate to high seismic hazard regions
with infrastructure that was not built to withstand significant earthquakes.
Events such as the 2011 Virginia earthquake, data from EarthScope and
GeoPRISMS, paleoseismic studies, and modeling may provide evidence for
neotectonic earthquakes and their driving mechanisms in relation to crustal
structure. New results from EarthScope Flexible Array experiments in the region
are revealing the presence of large velocity anomalies in the upper mantle that
may be linked to earthquake occurrence. We welcome contributions in any
geoscience discipline, including but not limited to seismology, structural
geology and tectonics, geomorphology, geodynamics, paleoseismology,
geochronology, geophysical imaging, and numerical modeling, that contribute new
evidence for earthquakes, refine or improve existing earthquake histories,
evaluate the potential for reactivation of ancient faults, or provide new
models explaining earthquake causal mechanisms.</span><span style="font-size:10pt;font-family:arial,sans-serif"><span></span></span></p>

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<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">Information on the
Annual Meeting is at </span><a href="http://community.geosociety.org/gsa2017/home"><span style="font-size:10pt;font-family:arial,sans-serif">http://community.geosociety.org/gsa2017/home</span></a><span style="font-size:10pt;font-family:arial,sans-serif;color:black"> , and the abstract submission form can be found
at </span><a href="http://community.geosociety.org/gsa2017/science-careers/sessions/topical"><span style="font-size:10pt">http://community.geosociety.org/gsa2017/science-careers/sessions/topical</span></a><span style="font-size:10pt;color:black"> . The abstract deadline is 1 August. You may
submit up to two volunteered abstracts as a presenting author for the Annual
Meeting if one of these abstracts is for a poster presentation. If you are
interested in submitting an abstract for this session, we would appreciate your
letting us know in advance. Please forward this e-mail to anyone who may be
interested.</span></p>

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<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">We hope to see you in Seattle!<br>
<br>
Wright, Chris, and Rob</span></p><p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><br>
<br>
<span></span></span></p>

<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">J. Wright Horton, Jr., U.S.
Geological Survey, 926A National Center, Reston, VA 20192, USA, </span><a href="mailto:whorton@usgs.gov"><span style="font-size:10pt;font-family:arial,sans-serif">whorton@usgs.gov</span></a><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><span></span></span></p>

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<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">Christine A. Powell, Center
for Earthquake Information and Research, University of Memphis, 3890 Central
Avenue, Memphis, TN 38152, USA, </span><a href="mailto:capowell@memphis.edu"><span style="font-size:10pt;font-family:arial,sans-serif">capowell@memphis.edu</span></a><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><span></span></span></p>

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<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">Robert A. Williams, U.S.
Geological Survey, Geologic Hazards Science Center, 1711 Illinois Street,
Golden, CO 80401, USA, </span><span style="font-size:10pt;font-family:arial,sans-serif"><a href="mailto:rawilliams@usgs.gov">rawilliams@usgs.gov</a></span><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><span></span></span></p><p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><br></p></div></div></div></div>
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