Site response analysis
Dear Daniela,
You can start with the following article: https://communities.bentley.com/products/geotech-analysis/w/plaxis-soilvision-wiki/46050/site-response-analysis-and-liquefaction-evaluation
and check also our Reference manual as there is a detailed description of the tool.
For specific questions, please submit a service request.
Then, one of our support engineers can help you in detail: https://apps.bentley.com/srmanager/ProductSupport