Vancouver Island Branch – Impacts of Long Duration Earthquakes


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The SEABC Vancouver Island branch invites all who are interested to the January afternoon seminar regarding the Impacts of Long Duration Earthquakes (LDEs). We have a series of subject matter experts presenting leading edge scientific knowledge on the seismic topics noted below.

Please bring your curiosity and join us for an afternoon of tectonic education! The seminar will be recorded and shared with all registrants.

This event will be four hours long and held in hybrid format on January 26, which is the 324th anniversary of the M9 Cascadia Megathrust Earthquake of 1700 (LINK).  PDH certificates for four hours will be provided to all attendees.

The presentation schedule is as follows:

  • Speaker:
    • Dr. John Cassidy, Earthquake Seismologist for Natural Resources Canada (Speaker profile)
  • Seismological Introduction
    • What are “long duration” earthquakes?
    • Long-period (~2-10 s) vs long duration
    • Long-period large earthquake characteristics
    • British Columbia tectonics – where have large earthquakes occurred?
    • BC events which produce long-period energy and long duration shaking
    • Global examples – Chile, Japan, and New Zealand
    • Recent global research into long period, long duration earthquakes
  • Speakers::
    • Dr. Carlos Ventura, Professor of Structural and Earthquake Engineering at UBC (Speaker profile)
    • Dr. Armin Bebamzadeh
    • Dr. Mike Fairhurst
  • Effects of Long Duration Shaking on Structural Response
    • State of knowledge on structural response and building codes due to long duration shaking
    • Observed response of instrumented structures subjected to long duration shaking
    • Types of structures sensitive to long duration ground shaking
    • Effect of long duration ground motions on the structural response of RC shearwall buildings
  • Speakers: 
    • Dr. Carlos Ventura
    • Dr. Armin Bebamzadeh
    • Chris Weech
    • Dr. Jamal Assaf
  • Effects of Long Duration Shaking on Design Practice
    • NBC Commentary updates for ground motion selection/scaling, including long duration earthquakes in BC
    • Site Specific Response Analysis as part of the Seismic Retrofit Guidance (SRG) program
    • Sedimentary Basin Effects – Microzonation group efforts and findings
    • Tall Buildings Design Guidelines – Long period ground motion effects
    • Importance of Geotechnical input
  • Seminar Information
    • Date: Friday, January 26, 2024
    • Time: 1:00 pm to 5:00 pm
    • Location: Liz Ashton Campus Centre, LACC124 Lecture Theatre, at Camosun Interurban Campus, Victoria (
    • Cost: $100+GST for individual or $500+GST for group tickets (8 people maximum for in person)
    • Light refreshments will be provided

For more details or enquires, please contact dgao(Replace this parenthesis with the @ sign)


Additional information

Attendance Type

In person, Online