WP2 - Earthquake Parameters

Motivation: Earthquake catalogs represent a key input ingredient for the localization of seismic activity and for the quantification of recurrence rates for seismic hazard assessment. Some important progresses have been made in recent years, often based on a long term work done in different countries. Extended seismicity time-histories have been elaborated to be used as the backbone for objective and reliable estimates of these quantities. This is done by merging of datasets of different nature and accuracy, i.e. geological observations, historical reports and instrumental catalogues. Although this effort is aimed at gathering the most comprehensive information on past earthquakes, there are still some large uncertainties in the determination of the characteristics of old earthquakes, and in the determination of the focal depth of recent events.

Objectives: The general objective of this work package is to improve our knowledge of past earthquakes, by developing innovative methods and improving existing datasets, with a particular focus on low-to-moderate seismicity areas.

Coordination:  J. Mayor (EDF) and E. Nayman (EDF).

The historical component of the work package includes several actions dedicated to:

  • Collect new information on past earthquakes using data/text-mining techniques.
  • Develop methods for archeoseismicity, such as constraining the response of historical buildings to ground motion by involving approaches based on numerical modeling.
  • Identify site effects in historical databases.
  • Refine magnitude and focal depth estimates in historical catalogues.
  • Update the French and Czech national catalogues of earthquakes.


The instrumental component of the work package includes a list of actions aiming at:

  • Develop a 3-D crustal velocity model for the metropolitan France area.
  • Refine magnitude and focal depth estimates in instrumental catalogues.