Nomogram to help explain probabilistic seismic hazard

posted on 08.11.2019 by John Douglas
Nomogram summarising the results of simple probabilistic seismic hazard assessments (PSHAs) for peak ground acceleration and elastic response spectral acceleration for a structural period of 1s and return periods from 100 to 2500 years, where the effects of the activity rate and the slope of the Gutenberg-Richter relation are captured.

To read the nomogram, connect two of the variables (e.g. N(M0 = 4.5) and return period) with a straight line and where it crosses the axis for the third variable that is its value (e.g. PGA). Example calculations are shown using red lines for a return period of 475 years and an activity rate of N(M0 = 4.5) = 0.1 (a moderate seismicity zone).

It is a Type 10 nomogram drawn using the pynomo program.

For details see the Open Access article: https://link.springer.com/article/10.1007/s10950-019-09885-4 where this nomogram is presented.

An alternate to this nomogram in the form of an Excel spreadsheet is also available on figshare.