<div dir="ltr"><div><div class="gmail_signature"><p class="MsoNormal" style="margin-bottom:0.0001pt"><span style="color:black;font-family:Arial,sans-serif;font-size:10pt">Subject: Session on Evidence
for Neotectonic Earthquakes and Their Driving Mechanisms in the Intraplate
Region of Central and Eastern North America at 2016 GSA Annual Meeting</span><br></p>
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<p class="MsoNormal" style="margin-bottom:0.0001pt"><span style="font-size:10pt;font-family:Arial,sans-serif;color:black">Dear colleagues:</span></p>
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We encourage those of you conducting related research to submit an abstract
for <i><b>Topical Session T218. Evidence for Neotectonic Earthquakes
and Their Driving Mechanisms in the Intraplate Region of Central and Eastern
North America</b></i> at the Geological Society of America (GSA) Annual
Meeting, 25-28 September 2016, in Denver, Colorado. The session will include
invited keynote talks by Martin Chapman (Virginia Tech), Vedran Lekic (University
of Maryland), and Lara Wagner (DTM, Carnegie Institution of Washington). It is
sponsored by four GSA Divisions (Structural Geology and Tectonics, Geophysics,
Environmental and Engineering Geology, Quaternary Geology and Geomorphology),
EarthScope, and the U.S. Geological Survey. Depending on the number of
abstracts submitted, a parallel poster session in addition to the oral session may
be included.</span></p>
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<p class="MsoNormal" style="margin-bottom:0.0001pt;background-image:initial;background-repeat:initial"><span style="font-size:10pt;font-family:Arial,sans-serif;color:black">Rationale: </span><span style="font-size:10pt;font-family:Arial,sans-serif">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></p>
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<p class="MsoNormal" style="margin-bottom:0.0001pt"><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/gsa2016/home"><span style="font-size:10pt;font-family:Arial,sans-serif">http://community.geosociety.org/gsa2016/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://www.geosociety.org/meetings/2016/sessions/topical.asp"><span style="font-size:10pt;font-family:Arial,sans-serif">http://www.geosociety.org/meetings/2016/sessions/topical.asp</span></a><span style="font-size:10pt;font-family:Arial,sans-serif;color:black"> . The abstract deadline is 12 July. 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. </span><span style="color:black;font-family:Arial,sans-serif;font-size:10pt">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><p class="MsoNormal" style="margin-bottom:0.0001pt"><span style="font-size:10pt;font-family:Arial,sans-serif;color:black"><br></span></p>
<p class="MsoNormal" style="margin-bottom:0.0001pt"><span style="font-size:10pt;font-family:Arial,sans-serif;color:black">We hope to see you in Denver!<br>
<br>
Wright, Chris, and Rob<br>
<br>
</span></p>
<p class="MsoNormal" style="margin-bottom:0.0001pt"><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, <a href="mailto:whorton@usgs.gov">whorton@usgs.gov</a></span></p>
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<p class="MsoNormal" style="margin-bottom:0.0001pt"><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, <a href="mailto:capowell@memphis.edu">capowell@memphis.edu</a></span></p>
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<p class="MsoNormal" style="margin-bottom:0.0001pt"><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, <a href="mailto:rawilliams@usgs.gov">rawilliams@usgs.gov</a></span></p></div></div>
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