Fugro Upgrades EZ-FRISK Seismic Hazard Analysis Software

Fugro has released an upgrade to its EZ-FRISK package — seismic hazard analysis software used by consultants and academics. The new upgrade includes the Next Generation West 2 ground motion prediction models, and improved user interface along with software fixes.

By early 2015, the software will incorporate the U.S. Geological Survey (USGS) 2014 National Seismic Hazard Maps for the continental U.S., with the exception of California, and will include the Uniform California Earthquake Rupture Forecast (UCERF) version 2. Fugro provides UCERF version 3 ground motion reports for California as an independent consulting service.

The EZ-FRISK single site probabilistic and deterministic tool enables engineers and geoscientists to study seismic hazards in an easy and flexible manner. As with earlier releases, EZ-FRISK has modules for probabilistic and deterministic seismic hazard analysis (PSHA/DSHA) (with globally available regional seismic source models and a database of ground motion prediction models); spectral matching (adjusting an accelerogram to match a target response spectrum, while preserving realistic time-dependent characteristics of the ground motion); and site response (calculating the ground motion at the surface given a bedrock ground motion and the layers of soil and rock that overlay the bedrock at the site).

EZ-FRISK can quickly create design ground motions for engineering purposes that use earthquake modeling and statistical analysis to accurately reflect the desired level of safety, provide realistic time-dependent behavior, and consider site-specific soil and rock layering.

The model was developed using a regional grand inversion process. The outputs are in the form of participation rates, rather than individual faults with defined slip rate or segmentation models. Instead faults are assigned magnitude frequency distributions that include participation of adjoining faults based on over 200,000 rupture scenarios.

“Fugro continues to extend its legacy of developing state-of-the-art software for the industry. We listen to our clients, and our engineers and geoscientists work closely with them to ensure that we provide the necessary tools for performing seismic hazard analyses worldwide,” said Recep Yilmaz, president of Fugro Consultants.