ESM REXEL-target-spectrum Web-Service

The ESM REXEL-target-spectrum web-service allows computation of design acceleration 5%-damping elastic spectra (from here on, 'target spectra') according to Eurocode 8 (EC8) (CEN 2003), Italian seismic code (NTC08) (CS.LL.PP. 2008) or user-defined spectra.

Spectra are generated according to code-based parameters e.g. by spectrum type, soil and topographic class, limit state probability, etc. A complete list of supported options and usage examples is available in the query-options webpage.

Feature Notes

• target spectra are provided for both horizontal and vertical components of ground motion. This output is defined on 30 periods sampled from 0.01 to 4s.
• selection of query-options for target spectra is mutually exclusive for the reference seismic code (e.g. spectrum-type according to 'EC8_eu' cannot be selected in conjunction with latitude and longitude)
• output data are provided in compressed archive (format zip) containing 5 ascii .txt files with Unix line endings:
  1. 30 periods target horizontal spectra ('TARGET_SPECTRUM.TXT')
  2. 30 periods target vertical spectra ('TARGET_SPECTRUM_Z.TXT')
  3. target horizontal spectra for graphical representation ('TARGET_SPECTRUM_PLOT.TXT')
  4. target vertical spectra for graphical representation ('TARGET_SPECTRUM_Z_PLOT.TXT')
  5. summary file resuming the query options ('TARGET_SPECTRUM_SUMMARY.TXT')

Related Services

ESM REXEL-target-spectrum web-service works in combination with:

• ESM REXEL-spectra-selection web-service provides machine-friendly access to response spectra included in the ESM Database
• ESM REXEL-disaggregation-values web-service provides the results of hazard disaggregation for 10,760 sites in Italy in terms of a modal terne of joint distribution of magnitudes (M), Joyner-Boore distances (R) and standardized residuals (ε).
• ESM REXEL-bmse-values web-service provides the results of spectrum compatible best matching scenario for sites in Italy in terms of magnitudes (M) and Joyner-Boore distances (R).
• ESM REXEL-run-matching web-service searches for sets of waveforms combinations that on average match the target spectrum within a specified tolerance
• ESM REXEL-outputs web-service returns final results
• ESM REXEL-plot web-service generates visual representation from ESM-REXEL outputs file

Backend Python software used by this web service was originally developed by Puglia R. and Sgobba S., and it is currently maintained by Felicetta C., Russo E., and Sgobba S.