cig_logo.png

 
 
 
 

Computational Infrastructure for Geodynamics (CIG) is a community-driven organization that advances Earth science by developing and disseminating software for geophysics and related fields.

CIGblogsmall_cs6.png  

 

 

Published papers this
year using CIG software?
Tell us about it!
submit 

 

Broadband (0-4 Hz) Ground Motions for a Magnitude 7.0 Hayward Fault Earthquake with 3D Structure and Topography

A team of researchers led by Arthur Rodgers, Lawrence Livermore National Laboratory (LLNL), performed fully deterministic broadband (0-4 Hz) high-performance computing ground motion simulations of a magnitude 7.0 scenario earthquake on the Hayward Fault (HF) in the San Francisco Bay Area of northern California using the HPC systems Cori and Quartz at LLNL. Simulations consider average one-dimensional (1D) and three-dimensional (3D) anelastic structure with flat and topographic free-surfaces. 

Hayward_Fault_M7.0_3DTOPO_ShakeMap.png

The 3DTOPO case models the domain utilizing the 3D USGS Bay Area geologic/seismic model, a realistic fault geometry, and a topographic free surface. The simulation included mesh refinement and required 15 billion grid points and ran on 2400 nodes (86,400 cores) for about 18 hours total for a total of 1.5 million core hours. Ground motion intensity measures (GMIM’s) for the 3D model display dramatic differences across the HF due to geologic heterogeneity, with low wavespeeds east of the HF amplifying motions. The median GMIM’s agree well with Ground Motion Prediction Equations (GMPE’s), however the 3D model generates more scatter than the 1D model. Ratios of 3D/1D GMIM’s from the same source allow isolation of path and site effects for the 3D model. These ratios show remarkably similar trends as site-specific factors for the GMPE predictions, suggesting that wave propagation effects in our 3D simulations are on average consistent with empirical data.  [research highlight]

 

Rodgers, A. J., Pitarka, A., Anders Petersson, N., Sjogreen, B. & McCallen, D. B.2018. Broadband (0-4 Hz) Ground Motions for a Magnitude 7.0 Hayward Fault Earthquake with 3D Structure and Topography. Geophysical Research Letters, 45. https://doi.org/10.1002/2017GL076505

 

Download Now

News

Feb
08
Announcement
Feb 08th - All Day
SW4 Simulation by LLNL Scientists.....
Jan
25
Announcement
Jan 25th - All Day
EOS: Computational Seismology Workshop Trains Early-Career Scientists.....
Dec
11
Announcement
Dec 11th - All Day
Geodynamo research breaks through surface of supercomputer analysis.....

Workshops

Apr
25
Workshop
Boulder, Colorado
Apr 25th - Apr 27th - All Day
2018 Coupling of Tectonic and Surface Processes
Jun
10
Workshop
Niagara Falls, Ontario
Jun 10th - Jun 14th - All Day
2018 CGU joint with CIG
Jun
19
Workshop
Big Bear Lake, California
Jun 19th - Jun 30th - All Day
Registration open!
Jun
19
Workshop
Big Bear Lake, California
Jun 19th - Jun 24th - All Day
Registration Pending ...

Webinars

Mar
08
Webinar
zoom
Mar 08th 2:00 pm - 3:00 pm
CIG Webinar.....
Apr
17
Webinar
zoom
Apr 17th 11:00 am - 12:00 pm
CIG Webinar.....

Sign In