Talk nhlib - a library for seismic hazard analysis


Seismic hazard analysis, that is the evaluation of earthquakes' probabilities of occurrence in a given time period and the corresponding ground shaking, it's a widely used methodology in the seismological and risk engineering communities to estimate earthquakes impact on structures and population.

Seismic hazard analysis is structured into two main steps: modeling earthquake sources, and calculate ground shaking from earthquakes. Typical results coming out from a seismic hazard analysis are probabilities of earthquake occurrence, synthetic seismicity histories, probabilities of exceeding ground shaking levels over a set of geographical locations in a fixed time span, and earthquake ground shaking fields.

The creation of earthquake sources (defined by seismological/geological data), implies the modeling of 3D surfaces (representing earthquake ruptures) in a spherical Earth. Ground shaking calculation is performed by employing empirical equations predicting ground shaking (with an associated uncertainty) at a given geographical location for a given earthquake rupture.

nhlib is an open-source software for performing seismic hazard analysis. It includes modules for modeling seismic sources (point, area and fault), earthquake ruptures, temporal (e.g. Poissonian) and magnitude occurrence models (e.g. Gutenberg-Richter), magnitude/area scaling relationships, ground motion and intensity prediction equations (i.e. GMPEs and IPEs). It offers a number of calculators for hazard curves, stochastic event sets, ground motion fields and disaggregation histograms. nhlib is written in python and makes heavy use of numpy for numerical calculations.

tagged by
no related entity