This is a place where you can find links to many active researchers in system identification and
information on the relevant conferences.

American Society of Civil Engineers, Engineering Mechanics Division

Check out the faculty members’ research, their publications and class notes to learn
system identification.

Dynamics Research Group at the University of Sheffield

Earthquake Engineering Research Laboratory, California Institute of Technology

IASC-ASCE SHM Task Group

 It is a very good place to start to learn system identification and structural health monitoring.
LANL Structural Health Monitoring

Natural Hazard Assessment and Mitigation,  University of Notre  Dame

Society for Experimental Mechanics,
Check out the IMAC Links of Interest  which will lead you to various interesting places
related to structural dynamics.

This is a place where you can find a lot of useful class notes on structural dynamics at various levels
and other useful educational and research information.

Structural Dynamics Research Lab (UC-SDRL), University of Cincinnati

Structural Dynamics – Seismic Response Control Laboratory, Duke University

Structural Engineering and Earthquake Simulation Laboratory (SEESL), SUNY Buffalo

WUSCEEL