NSF Org:	CMMI Division of Civil, Mechanical, and Manufacturing Innovation
Recipient:	UNIVERSITY OF ARKANSAS
Initial Amendment Date:	July 17, 2023
Latest Amendment Date:	July 17, 2023
Award Number:	2330153
Award Instrument:	Standard Grant
Program Manager:	Giovanna Biscontin gibiscon@nsf.gov  (703)292-2339 CMMI  Division of Civil, Mechanical, and Manufacturing Innovation ENG  Directorate for Engineering
Start Date:	July 1, 2023
End Date:	June 30, 2025 (Estimated)
Total Intended Award Amount:	$50,000.00
Total Awarded Amount to Date:	$50,000.00
Funds Obligated to Date:	FY 2023 = $50,000.00
History of Investigator:	Clinton Wood (Principal Investigator) cmwood@uark.edu
Recipient Sponsored Research Office:	University of Arkansas 1125 W MAPLE ST STE 316 FAYETTEVILLE AR  US  72701-3124 (479)575-3845
Sponsor Congressional District:	03
Primary Place of Performance:	University of Arkansas 800 W. Dickson Street FAYETTEVILLE AR  US  72701-3124
Primary Place of Performance Congressional District:	03
Unique Entity Identifier (UEI):	MECEHTM8DB17
Parent UEI:
NSF Program(s):	ECI-Engineering for Civil Infr, Tectonics, Geophysics, XC-Crosscutting Activities Pro
Primary Program Source:	01002324DB NSF RESEARCH & RELATED ACTIVIT
Program Reference Code(s):	036E, 037E, 043E, 7914
Program Element Code(s):	073Y00, 157200, 157400, 722200
Award Agency Code:	4900
Fund Agency Code:	4900
Assistance Listing Number(s):	47.041, 47.050

ABSTRACT

The 300-km-long magnitude (M) 7.8 earthquake rupture along the East Anatolian Fault in Türkiye is one of the largest strike-slip ruptures instrumented globally. At the same time, the 150-km-long M7.5 rupture of the largest aftershock on the Sürgü fault, produced surface displacements on the order of 8 m, exceeding, on average, the displacement-length relations used for the 2023 National Seismic Hazard Model (NSHM) update by more than fifty percent. These ruptures share a similar tectonic setting with the San Andreas Fault System (SAFS) in California, so evaluating the NSHM by comparison with the Türkiye fault ruptures is important in the context of risk reduction in the US. A similar rupture on the SAFS, often referred to as 'The Big One' in California, will threaten the population and economy of major urban centers, national defense installations, and other critical infrastructures. Observing and documenting displacements along these exceedingly long and rare ruptures is therefore critical to understanding and reproducing earthquake rupture processes, empirically and numerically; to reducing uncertainty in regional hazard models; and reducing the risk of distributed infrastructure systems that are vital to the health and prosperity of communities, and vulnerable to ground deformation, such as water and gas pipelines. Findings and open-source datasets from this Grant for Rapid Response Research (RAPID) fieldwork will guide public policy and engineering design codes through future improvements of the NSHM, as well as decision makers for a greater extent of societal well-being and national defense. To complete this work, partnerships between academia and government agencies in both the US and Türkiye have been established; the team is diverse and includes a balance of early-career scientists and senior scientists, geotechnical earthquake engineers and earthquake geologists, US-based and in-country collaborators, and scientists from underrepresented backgrounds.

The intellectual merit of this work lies in setting a new paradigm in fault rupture field mapping for engineering applications. While there is field, laboratory and numerical evidence that shallow geological conditions affect fault displacements, the evidence is at best qualitative, and thus the documented data cannot be integrated in engineering models for risk reduction. In order to capture these effects in predictive empirical models for engineering applications, new kind of dataset is needed that associates each fault displacement measurement site with geotechnical site characterization measurements. The primary field objectives include characterization of the 2023 ruptures by means of: (1) mapping the main fault rupture with high-resolution (cm-scale) GNSS surveys, photographs, ground-based lidar, and UAV-based terrain models, (2) documenting discrete and perishable offsets of cultural and geomorphic features, (3) characterizing the width and style of the deformation zone, (4) accompanying the measurements of the transient deformation zones with dynamic site characterization measurements on a sub-km scale using active source and ambient wavefield surface wave methods, along with horizontal to vertical spectral ratio (HVSR) measurements, (5) providing geological context (e.g., dominant geological processes and depositional units) for site characterization efforts, and (6) identifying secondary effects such as gravitational failures and liquefaction. Insights and scaling behaviors stemming directly from the field data will provide the first of what is envisioned to constitute the next-generation fault displacement datasets that will allow future PFDHA models to capture repeatable effects associated with local geologic conditions and fault geometry among other parameters.

This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

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