Authors / CoAuthors
Adams, J. | Allen, T. | Halchuk, S. | Kolaj, M.
Abstract
Canada's 6th Generation seismic hazard model has been developed to generate seismic design values for the 2020 National Building Code of Canada (NBCC2020). The model retains most of the seismic source model from the 5th Generation, but updates the earthquake sources for the deep inslab earthquakes under the Straits of Georgia and adds the Leech River - Devil’s Mountain fault near Victoria. The rates of magnitude ~9 Cascadia earthquakes are also increased to match new paleoseismic information. Two major changes in the ground motion model (GMM) are A) replacement of most of the three-branch representative suite used in 2015 by suites of weighted GMMs, and B) use and adaptation of various GMMs to directly calculate hazard on various site classes with representative Vs30 values, rather than providing hazard values on a reference Class C site and applying F(T) factors as in 2015. Computations are now also being performed with the OpenQuake engine, which has been validated through the replication of the 5th Generation results. Seismic design values (on various Soil Classes) for PGA, and for Sa(T) for T = 0.2, 0.5, 1.0, 2.0, 5.0, and 10.0 s are proposed for NBCC2020 mean ground shaking at the 2% in 50-year probability level. The paper discusses chiefly the change in Site Class C values relative to 2015 in terms of the changes in the seismic source model and the GMMs, but the changes in hazard at other site classes that arise from application of the direct-calculation approach are also illustrated.
Product Type
document
eCat Id
127118
Contact for the resource
Point of contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Point of contact
Keywords
- theme.ANZRC Fields of Research.rdf
-
- EARTH SCIENCES
- ( Theme )
-
- probabilistic
- ( Theme )
-
- seismic hazard
- ( Place )
-
- Canada
- ( Theme )
-
- National Building Code
- ( Theme )
-
- Cascadia
-
- Published_External
Publication Date
2020-08-13T01:59:42
Creation Date
Security Constraints
Classification - unclassified
Legal Constraints
Status
final
Purpose
Submission to the 12th Canadian Conference on Earthquake Engineering
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
Collaboration with Canadian colleagues as part of the development of an updated Seismic Hazard Model for consideration by the Building Code of Canada D2019-22000
Parent Information
Extents
[-44, -9, 112, 154]
Reference System
Spatial Resolution
Service Information
Associations
Source Information