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Latest News

ST-RISK version 4.61 is now available

Version 4.61 of ST-RISK incorporates many improvements to the Probabilistic Seismic Hazard Assessment (PSHA) logic and brings the long awaited USGS National Seismic Hazard Map 2014 update for the lower 48 contiguous United States! See our validation report for these updated regions here.

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What is ST-RISK?

ST-RISK is a software package used by insurance and mortgage due-diligence investigators and structural engineers to perform detailed earthquake risk analysis for individual buildings. These analyses and reports are used by mortgage brokers to make lending decisions, insurance brokers to rate assessments, and building owners to make seismic retrofit plans.

What Can It Do?

ST-RISK is the premier software tool for site-specific earthquake risk management. It is the preferred product for creating Probable Maximum Loss (PML) Reports. PML is an industry standard method to assess earthquake risk.

How Does It Work?

For a given structure, you would give basic information about the building (site coordinates, age, structural system, height, etc.) for a screening analysis, and if you are a licensed engineer, you provide a detailed assessment of the structures strengths and weaknesses based on the ASCE 31-03 approach. ST-RISK calculates the building vulnerability to earthquake damage.

The program then calculates quantitative earthquake risk metrics such as PL, SUL, and SEL by combining the earthquake hazard analysis and the building vulnerability analysis. It then generates a detailed seismic risk report suitable for inclusion in your overall client report.

How is It Licensed?

ST-RISK is licensed on a project usage basis. This allows recovery of the cost of the software as a direct project cost. You don't need to make a risky investment in an expensive long-term software license. You don't need be sidetracked into developing your own in-house PML report procedure and keeping it up-to-date.

Technical Background
Technical Background


What Can ST-RISK Do for You?

Site-Specific Spectrum - If you are a structural engineer designing a new building, this program can quickly provide a site-specific spectrum to use for calculating design loads.

Engineers Can Help Owners Understand Risk - If you are retrofitting an existing structure, ST-RISK provides insight into building behavior that will help you decide what to retrofit and how to guide the property owner in making a sound financial decision. By utilizing the cost analysis module within ST-RISK, you can develop justification for different alternate retrofit scenarios.

Due Diligence – If you are providing due diligence services to financial institutions, ST-RISK is the most comprehensive and reliable tool available for providing site-specific PML/PL estimates.

Underwriting – If you are an underwriter, ST-RISK allows you to underwrite a structure, using general building and soil characteristics or a detailed seismic evaluation of the building and soil characteristics, to estimate a PML/PL or to obtain a loss for a specified return period.

ST-RISK can be used for commercial and residential risk analyses. It contains a database of seismicity and soil information in all major earthquake zones of the U.S. and Canada.

Users will find that ST-RISK sets the standard for due diligence examinations. ST-RISK can also provide clients with the data and analyses to make informed decisions on earthquake risk mitigation for individual structures or for portfolios of structures. For example, one of our clients used ST-RISK to determine the most cost-effective retrofit strategy (among three alternatives) for his property. Another client used ST-RISK to put priorities on retrofits for a portfolio of academic buildings, none of which met current seismic codes.

For individual properties, ST-RISK can be used to guide corporate risk managers in their pursuit of managing their company’s earthquake exposure. This tool is unrivaled in its ability to provide detailed information required by risk managers to help them reduce, transfer, or retain earthquake risk.

Using the cost-benefit feature of ST-RISK, you can demonstrate to building owners the economic benefits of retrofitting a building. The client may then be able to present this information to insurance companies for a rate reduction, or to banks for the purpose of negotiating lower mortgage rates.

Technical Background

Technical Overview

ST-RISK is an earthquake risk management tool that can be used for individual buildings. In helping to manage risk, the program must first be able to quantify it.

In the course of quantifying a building's risk to earthquake damage, the hazard must first be determined. The hazard reflects the probability that various levels of ground shaking will occur. A specific site's susceptibility to ground shaking is due to the following factors:

  1. Proximity of site to active faults
  2. Recurrence rate of events on nearby faults
  3. Size of events that can be generated on nearby faults
  4. Local soil conditions

The hazard only reflects to the likelihood and intensity of ground shaking. To obtain risk measurements, the effects of the ground movement on the building must also be considered. As the ground underlying a building shakes, the building suffers damage, and damage results in economic loss. Higher levels of shaking cause higher levels of damage and higher levels of loss. Risk, therefore, reflects the likelihood that certain levels of economic loss will occur.

Historical loss data, organized engineering reconnaissance information, and instrumental ground shaking measurements are used by ST-RISK to correlate ground movement with economic loss. This correlation has been done for different levels of ground shaking, different building types and different building characteristics.

Important characteristics essential to seismic resilience have been identified by FEMA-310. ST-RISK provides a FEMA-310 worksheet that enables an engineer to properly characterize structural strengths and deficiencies.


Register for ST-RISK providing contact information, as well as a user name and password.

Download the software using an existing account.

Purchase additional usages for an existing account.

Internet Requirements

ST-RISK is installed locally and uses the internet for the following:

  • Downloading the application installer following user registration
  • Authentication of registered users
  • Authorizing and tracking usages
  • Downloading regional data and any program updates

ST-RISK is a program that runs on computers using the Microsoft Windows operating system. Upon execution the program establishes a connection to our web server, whereby the site usage can be monitored and prepurchased credits appropriately recognized.

The program tracks usage by monitoring the latitudes and longitudes of your analysis sites. Each new site location is realized by the server and a credit is deducted (at execution time). You can run as many sensitivities and parametric studies as you wish for each site without any credit penalties.

Each time the software is started up you will be prompted for a username and password. These are established during the registration process. Down the road you can manage your account and purchase additional site evaluations with this username and password so please remember what you have entered (we have no access to the password).

We will be notified of any changes you make to your account. We also provide support for any questions or reasonable requests you make.

Fee Structure

ST-RISK is licensed on a per-project basis. This allows you to charge your client for use of the software as a direct cost to the project. Contact Fugro USA Land at to obtain the latest pricing information.

System Requirements

ST-RISK Windows Vista or any newer version of Windows. The program requires 300 mb of disk space. During typical use, ST-RISK requires access to the internet for authentication, authorization, and downloading of regional data. This access is via the standard SSL port 443. This access can be through an standard authenticating proxy server if necessary. Offline authentication and authorization is supported for users who are unable to appropriately configure their organization firewall to allow the ST-RISK executable to access the internet.

Please note: Offline authorization is much less convenient for the user than online authorization.


The Fugro USA Land staff is committed to providing timely and quality support.

Software Sales and Phone Support Help Desk Business Hours
7:30 AM to 3:00 PM Pacific Time, Monday through Friday
Closed – Saturday, Sunday, and All Major Holidays

Contact for Software or Seismic Hazard Issues

Fugro USA Land, Inc.
1777 Botelho Dr., Suite 262
Walnut Creek, CA 94596
Phone: 925-949-7170

Contact for Explanation and Interpretation of Building Damage Functions

Degenkolb Engineers
600 University Street, Suite 720
Seattle, WA 98101
Phone: 206-262-9240 (receptionist)
Attention: Kyle Steuck, P.E., S.E.
Phone: 206-340-8108 (direct)