Conditional probability of distributed surface rupture using the fdhi databaseproject period: 9 1 2025 through 8 31 2026AWARD purpose: many critical and important facilities such as dams, powerplants,…

Ended Project Grant Awarded Last action

Award ID
G25AP00449
Recipient
Awarding agency
Obligated
$87,928

Award facts

Assistance listing
15.807 Earthquake Hazards Program Assistance
Completion date
Funding
  • $65,928.00 Federal
  • $22,000.00 Non-federal
Place of performance
California, USA

Award details come from USAspending.gov.

Description

As the agency reported it.

Activities
The project will build on existing methodologies and uses a significantly expandeddatabase of well-mapped historic surface-fault ruptures and an efficient workflow using geographicalinformation system (GIS) tools. No new primary data will be collected and no fieldwork will be performed. The first activity is completing the development of an automated GIS workflow using an industry and academic standard platform to efficiently process publicly-available surface-fault rupture trace data. The resultingprocessed data will be evaluated to develop statistics on the patterns and frequency of distributed faulting awayfrom principal ruptures. These results will be fit to equations to predict the average behavior and uncertaintiesin the probability of a distributed rupture with distance from a principal fault rupture. Coefficients will bedeveloped to model the probability of distributed rupture based on factors such as style of faulting, buildingfootprint size, and hanging wall or footwall location for dipping faults.deliverables and expected outcomes: the final technical report will document the objectives, approach, datainputs, and model results. Results will consists of equation(S) expressing the conditional probability ofdistributed displacement for a site located away from an active fault and tables of coefficients to be used withthe equations. Uncertainties in the results will be captured in the form of standard deviations of sets ofcoefficients for different uncertainty percentiles. Additional electronic data products will be included to allowusers to interrogate the results and develop alternative models for use in site-specific analyses. We will publishour findings in a peer-reviewed, open-access journal and provide all supplemental data and tools as open-sourceproducts.
Intended beneficiaries
Owners and stakeholders of critical and important infrastructure such as dams, nuclear power plants, landfills, and buildings located near active faults that are vulnerable to the hazard of surface-fault displacement geoscientists and engineers.
Subrecipient activities
N A

Quick answers

Who received award G25AP00449?

G25AP00449 was awarded to Lettis Consultants International Inc. by Office of Acquisitions and Grants (US Geological Survey) on September 1, 2025.

How much is award G25AP00449 worth?

$87,928 has been obligated on G25AP00449: $65,928 in federal funding and $22,000 in non-federal funding.

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