The purpose of the CyberShake Project is to calculate Probabilistic Seismic Hazard curves for several sites in the Los Angeles area. The hazard curves in this study will be generated using 3D ground motion simulations rather than empirically derived attenuation relationships.

An important element of the Project is to develop the computational infrastructure (the cyberinfrastructure) that will enable us to calculate hazard curves for new earthquake rupture forecasts as they are developed.

The following documents describe various aspects of the CyberShake Project:

Descriptions Of Project:

• CyberShake Overview (Maechling) (ppt)
• CyberShake Overview (Graves) (ppt)
• CyberShake Short Review (Graves) (ppt)

Project Science Documents:

• Proposed Site List with Map (pdf)
• Proposed Standard Rupture format
  • Overview Description (Graves) (ppt)
  • Detailed Text Description (Graves) (pdf)
• Example Puentes Hill Rupture in Standard Format (txt)
• Rupture Slip Variation Examples (Graves) (ppt)
• OpenSHA Seismic Hazard Analysis Overview (Gupta) (ppt)

Project IT Documents:

• Strain Green Tensor Workflow (jpg)
• Seismogram Synthesis Workflow (jpg)
• Grid-based Software Stack (Mehringer) (ppt)
• Waveform-based IMR Design Document (Gupta) (pdf)
• Grid-testbed Monitoring Site (SCEC Grid Testbed Status)

Project Planning Documents:

• CyberShake Workplan (Maechling) (pdf)

TeraGrid Proposals:

• TeraGrid 2005 Allocation Request (pdf)
• Advanced TeraGrid Support Request (pdf)

SCEC Cyberinfrastructure Descriptions:

• CyberShake as Cyberinfrastructure Driver (Jordan) (ppt)
• SCEC Seismic Simulations Middleware Reqs (Maechling) (ppt)

The following ten sites have been selected for the initial hazard curve calculations. More sites will be added after these are completed and evaluated.

1. USC - Basin Site at location of USC Terrascope station.
2. PAS - Rock site at location of PAS Terrascope station.
3. LADT - Los Angeles Downtown. Site of 310 meter building in Los Angeles.
4. LBP - Long Beach Port. Site of proposed port construction.
5. SABD - Santa Ana business district. Site of proposed high-rise construction.
6. WNGC - Whittier Narrows Golf Course. Site of strong ground motions in TeraShake simulations.
7. SBSM - San Bernardino Strong Motion. Site of basin effects recorded during Hector Mine.
8. FFI - I5-14 Interchange. Site of freeway collapse during Northridge.
9. CCP - Century City Plaza. Site of 150 meter building in Century City.
10. SMCA - Santa Monica Civic Auditorium near business district in Santa Monica.

Site Lat/Lon used in SGT Calculations:

(1) USC 34.019200 -118.28600 - "USC Terrascope"
(2) PAS 34.148427 -118.17119 - "PAS Terrascope"
(3) LADT 34.052041 -118.25713 - "Los Angeles Downtown"
(4) LBP 33.754944 -118.22300 - "Long Beach Port"
(5) SABD 33.754111 -117.86778 - "Santa Ana Business District"
(6) WNGC 34.041823 -118.06530 - "Whittier Narrows Golf Course"
(7) SBSM 34.064986 -117.29201 - "San Bernardino Strong Motion"
(8) FFI 34.336030 -118.50862 - "I-Five Fourteen Interchange"
(9) CCP 34.054884 -118.41302 - "Century City Plaza"
(10) SMCA 34.009092 -118.48939 - "Santa Monica Civic Auditorium"

The following image shows a set of 10 hazard curves for one particular site. The curves show an Intensity Measure Level (x-axis) and the Probability of Exceedence (y-axis) for each intensity level. These curves were calculated using an attenuation relationship. CyberShake hazard curves will be compared against curves like these to determine if 3D ground motion modeling produces hazard curves that differ significantly from attenuation relationship-based hazard curves.