Seismic Hazard Analysis

IITB Logo Manish Kumar
Assistant Professor

Department of Civil Engineering
Indian Institute of Technology Bombay, Mumbai

Seismic Hazard Analysis

1. Calculation of seismic hazard curves

2. Selection and scaling of ground motions consistent with seismic hazard at a site to perform response history analysis of a structure

Seismic Hazard Analysis and Ground Motion Selection

Seismic Harzard Characterization

The first step in seismic analysis of a structure is to define seismic hazard at the location of the structure. It can either be determinstic seismic hazard analysis (DHSA) or probabilitic seismic hazard analysis (PSHA). Following references can be useful for beginners:

  • McGuire, Robin K. Seismic hazard and risk analysis. Earthquake Engineering Research Institute, 2004.

  • Bozorgnia, Yousef, and Vitelmo V. Bertero, Earthquake engineering: from engineering seismology to performance-based engineering. CRC Press, 2004.

  • Kramer, Steven L. "Geotechnical earthquake engineering." Prentice-Hall Civil Engineering and Engineering Mechanics Series, NJ: Prentice Hall, 1996.

  • Villaverde, Roberto. Fundamental concepts of earthquake engineering. Baton Raton, FL: CRC Press, 2009.

The reference by Mcguire is especially useful and it provides comprehensive treatement of hazard and risk analysis.  

Selection and Scaling of Ground Motion for Response History Analysis

 ATC-82/ NIST GCR 11-917-15 document on the most updated methodology on selection and scaling of ground motions for response history analysis.

Databases of recorded ground motion: PEER NGA ground motion database
                                                        COSMOS
                                                        K-NET

USGS Website for Seismic Hazard: It has tools for calculation of the all se hazard data

http://earthquake.usgs.gov/hazards/

Baker Research Group

The research group of Dr. Jack Baker at Standford University provides many useful resources including technical reports, journal papers, matlab source codes, and lecture videos on the current research going in the field of seismic hazard analysis.

http://www.stanford.edu/~bakerjw/Publications/Baker_(2008)_Intro_to_PSHA_v1_3.pdf

http://www.stanford.edu/~bakerjw/video.html

Ground Motion Selection, Processing, and Scaling Software Program

The SeismoSoft software company (http://www.seismosoft.com) produces a range of softwares programes for calculations pertaining to seismic hazard. An academic license can be obtained by sending a request through a valid .edu email id. I have used two of their software programs:

SeismoSignal: For processing of ground motions (http://www.seismosoft.com/en/SeismoSignal.aspx).

SeismoMatch: For scaling of ground motions to a program generated or user defined spectrum. It uses the same algorithm as in RspMatch2005 by Hancock et. al (2006), but provides an user friendly graphical-user interface and many post processing options (http://www.seismosoft.com/en/SeismoMatch.aspx).
To verify the results of SeismoMatch with RspMatch2005, I chose a random ground motion and scaled using both software to a UHRS target spectrum for periods between 0.05 and 3 sec. The results from both software programs were almost same. The comparison in presented in the pdf file attached here.