SUBITOP Topo-Europe Conference on Subducton Zone Topography

Dear SCEC Community,

Please see below for the following two SSA2020 session announcements:

1. Advances in Upper Crustal Geophysical Characterization
2. Crustal Stress and Strain and Implications for Fault Interaction and Slip

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1. Advances in Upper Crustal Geophysical Characterization:
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Dear Colleagues,

Please join us in Albuquerque, New Mexico from 27–30 April, 2020 for the SSA Annual Meeting and consider participating in the session entitled "Advances in Upper Crustal Geophysical Characterization" (description below). Abstracts are now being accepted until 14 January, 2020. Please see https://www.seismosoc.org/annual-meeting/ for additional meeting details.

Session description:
The upper crust plays a critical societal role, from access to clean water to the production of energy to the impact of geologic hazards. It is also our window into the layers below; geophysical variability in the near surface can be inadvertently mapped into deeper structure if not properly considered. With respect to seismic hazards and earthquake ground motions, variability in near surface geophysical properties can lead to an overall amplification or deamplification of strong ground motions, large lateral variability in site response, as well as resonance at specific ground shaking frequencies. With respect to groundwater, characterizing soil porosity, regolith development and fracture permeability all lead to better estimates of storage potential and groundwater flow rates. Geophysical characterization of the near surface is therefore critical to being able to address these issues. A vast number of methods exists with which to characterize the subsurface from direct methods that measure rock density and seismic velocity in-situ to indirect methods where seismic wave travel times, gravity, resistivity and other parameters are measured at the Earth’s surface, and subsurface properties are inferred. We seek contributions that include direct and indirect field observations, laboratory experiments and geophysical theory that link observation and expectation to studies that explore the impact of competing assumptions.

See you in Albuquerque!

Oliver Boyd, USGS Golden (olboyd@usgs.gov)
Bill Stephenson, USGS Golden (wstephens@usgs.gov)
Lee Liberty, Boise State University (lliberty@boisestate.edu)

2. Crustal Stress and Strain and Implications for Fault Interaction and Slip:
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This session focuses on (1) the estimation of the state of stress/strain in different phases of earthquake cycle and (2) the analysis of stress/strain distributions at different spatial and temporal scales by soliciting works based on theory, observations, modeling and laboratory experiments.
The session is planned to address the following questions: 1) What can we extract from geodetic, geologic, borehole and seismic data regarding the state of stress and strain at regional and local scales? 2) How are stress and strain distributed in laboratory experiments and nature and how can we bridge the two? 3) What are the insights from numerical simulations on the state of stress and to what extent can models help in interpreting observations such as earthquakes or slow slip events? 4) How will spatial stress/strain variations from long-term data compilations improve our knowledge of the motion partitioning across complex fault zone areas, aseismic slip, fault zone structure and earthquake cycles? 5) How can information on the state of stress/strain be used to improve long-term earthquake forecasting and seismic hazard assessments?

The deadline to submit an abstract is January 14, 2020.

Full meeting information: www.seismosoc.org/annual-meeting/
To submit your abstracts: www.seismosoc.org/meetings/submission-system/

Conveners
Niloufar Abolfathian, University of Southern California (nabolfat@usc.edu);
Thomas H. W. Goebel, University of Memphis (thgoebel@memphis.edu);
Mong-Han Huang, University of Maryland (mhhuang@umd.edu)

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