Introduction

AUTOSIGMA and SIGMA are modules of the sigma package for SeisComP to compute and to visualize strong motion event parameters. The calculated parameters can be stored as incidents in a database and used to create customized reports. While AUTOSIGMA computes the strong motion parameter automatically based on a static configuration, SIGMA provides a highly flexible user-interaction through a modern and user-friendly graphical user interface (GUI).

The sigma package also provides plugins for onsite early warning.

../_images/sigma_map_pga.png

Figure 7: SIGMA GUI showing PGA.

Applications

  • Automatic and Interactive strong ground motion analysis for earthquakes,

  • Map generation for MMI, PGA, PGV,

  • Computation of earthquake engineering parameters,

  • Comparison, evaluation and selection of Ground Motion Prediction Equations (GMPEs) and Ground Motion Models (GMMs),

  • Report and image generation for earthquake information services,

  • Amplitude processing and onsite early warning.

Features

  • User friendly and modern interactive graphical interface

  • Semi-automatic and interactive data processing

  • Maps showing intensity (MMI)

  • Maps showing Peak Ground Acceleration (PGA) and Velocity (PGV)

  • RMS of acceleration, velocity and displacement

  • Arias (Ia) and characteristic (Ic) intensities

  • Cumulative absolute velocity (CAV)

  • Specific energy density (SED)

  • Predominant (Tp) and mean (Tm) periods

  • Fourier, power and response spectra

  • Interactive definition of complex rupture geometries

  • Interface to SeisComP and FDSN web services for imporing seismic events

  • Handling of internal incidents and export to the SIGMA database

  • Supporting open source C++ and Python plug-ins

  • Interface to OpenQuake hazard library and user-defined python scripts for calculating the ground motion parameters

  • Report generation based on user-defined scripts

  • On-the-fly customization of processing and look and feel parameters.

Technology

AUTOSIGMA and SIGMA provide and make use of plug-ins allowing to predict ground motion parameters based on GMPEs/GMMs which can be viewed on maps and added to reports. Local Vs30 models are considered. Actual amplitude measurements are made on waveforms automatically or interactively and stored along with incidents. They can be compared with predictions.

Amplitude measurements are additionally provided by amplitude plugins for application by external SeisComP modules, e.g. scolv, scautopick or scamp. scautopick is then capable of supporting onsite early warning.

Promotion at science conferences

The SIGMA module has been demonstrated, promoted and discussed with scientists and the SeisComP community at international science conferences, e.g.:

  • B. Weber, J. Becker, D. Roessler and the team of gempa: Earthquake Intensity and Strong Motion Analysis within SeisComP3, 2017, Bad Breisig, Germany, AG Seismologie meeting

  • B. Weber, J. Becker, H. Ghasemi, P.R. Cummins, J. Murjaya, A. Rudyanto, D. Roessler and team of gempa: EARTHQUAKE INTENSITY AND STRONG MOTION ANALYSIS WITHIN SEISCOMP3, 2017, New Orleans, USA, AGU Fall Meeting, abstract S41F-02.