Moved:CyberShake MCER

For the Utilization Committee meeting on November 3, 2014, we are preparing probabilistic and deterministic MCER results using the CyberShake dataset.

Meeting

November 3, 2013 meeting agenda is available here.

The handout for the meeting with a map of the sites and velocity information is available here:

A presentation to introduce and explain the MCER results is available here.

Study Sites

We are calculating MCER results for 14 sites, available in a KML file Image to the right shows the location of the MCER 2014 study sites. These sites can be plotted using the following KML file:

• MCER 2014 Study Sites (Google Earth KML Format). (KML file)

Near surface information about these sites includes Vs30, Z1.0, Z2.5 Values. These values are used in GMPE calculations for these sites. Site names, locations, and near surface values are listed in the following file.

• Site List with Vs30 Information (CSV File)

Results

Plots for each of the 14 sites are available in the following table.

Site	Full name	Probabilistic MCER	Deterministic MCER	Combined MCER results	Overall MCER results
CCP	Century City Plaza
COO	Compton
LADT	Los Angeles Downtown
LAPD	Lake Palmdale
P22	P22
PAS	Pasadena
s429	s429
s603	s603
s684	s684
s758	s758
SBSM	San Bernardino Strong Motion
SMCA	Santa Monica Civic Auditorium
STNI	710/90 Interchange
WNGC	Whitter Narrows Golf Course

More details about each plot type are provided below.

Probabilistic MCER Results

CyberShake probabilistic MCER results for the 14 sites. This also contains comparable RotD100 results for the 2008 and 2014 NGAs.

• Probabilistic MCER Results. (Excel xlsx file)

This zip file contains pseudo spectral velocity plots for the probabilistic results.

• Probabilistic MCER Plots. (815Kb Zip File containing PNG images)

Metadata for these results include:

• CyberShake Model: Study 14.2
• Velocity Model: CVM-S4.26
• Earthquake Rupture Forecast: UCERF2
• Rupture Generator: GP 2010
• Background Seismicity: None
• RotD100 Software: Modified BBP RotD50
• GMPE 2008 GMRotI50 to RotD100 conversion factors: See spreadsheet
• GMPE 2014 RotD50 to RotD100 conversion factors: See spreadsheet

Disaggregation Plots

We disaggregated the CyberShake and NGA hazard curves at 3 seconds and plotted the top 10 contributors for each site. These plots are available here: Disaggregation Plots

Background Seismicity Plots

To determine the impact of background seismicity, we calculated the contributions of on-fault and background seismicity to the NGA hazard curves. These plots are available here: Background Seismicity Contribution Plots

Deterministic MCER Results

CyberShake deterministic MCER results for the 14 sites, along with comparable results for the 2008 and 2014 NGA models.

• Deterministic MCER Results. (Excel xls file)

This zip file contains pseudo spectral velocity plots for the deterministic results.

• Deterministic MCER Plots. (850Kb zip file containing PNG images)

Metadata for these results include:

• CyberShake Model: Study 14.2
• Velocity Model: CVM-S4.26
• Earthquake Rupture Forecast: UCERF2
• Rupture Generator: GP 2010
• Background Seismicity: None
• RotD100 Software: Modified BBP RotD50
• GMPE 2008 GMRotI50 to RotD100 conversion factors: See probabilistic spreadsheet
• GMPE 2014 RotD50 to RotD100 conversion factors: See probabilistic spreadsheet

Combined MCER Plots

From the probabilistic and deterministic results, we have produced combined MCER plots of two types, both plotting PSV at periods from 1-10 sec, using the probabilistic and deterministic results previously calculated for the 14 sites identified by the Utilization Committee.

Type A contains 5 curves for each site and are available in a zip file here: All combined plots (~400KB zip file containing PDF, PNG, and TXT files)

1. average of the probabilistic NGAs (2014) without Idriss. This was obtained by averaging the 4 NGA hazard curves, then convolving with the fragility function.
2. average of the deterministic NGAs (2014) without Idriss
3. probabilistic MCER for Cybershake
4. deterministic Cybershake
5. ASCE 7-10 Det Lower Limit

Type B contains 3 curves for each site and are available in a zip file here: MCER combined plots (~300KB zip file containing PDF, PNG, and TXT files)

1. CyberShake: lower of probabilistic MCER and (higher of deterministic and ASCE deterministic lower limit). For CyberShake, the probabilistic is always lower than the deterministic.
2. NGA (2014): lower of probabilistic MCER and (higher of deterministic and ASCE deterministic lower limit).
3. ASCE 7-10 Ch 11.4

GMPE Background Seismicity Sensitivity

Members of the UGMS committee requested a comparison of probabilistic RTGM spectra for the GMPEs with and without UCERF2 background seismicity included. As CyberShake does not currently consider background seismicity, this to test the assumption that the contribution from background seismicity is negligable in the Los Angeles region. These calculations use the average of the 2014 NGAWest2 GMPEs, excluding Idriss.

Download a zip file with results for all 14 sites here: Media:Gmpe_back_seis_compare.zip.

The result calculation for the LADT site is shown below.

GMPE RTGM Spectrum for LADT with and without background seismicity.