Monthly Web Conferences

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The purpose of these monthly web conferences is to coordinate the current SCEC GMSV TAG research projects.


PLEASE NOTE: Presentation slides below are the author's property. They may contain unpublished or preliminary information and should only be used while viewing the talk.


March 31, 2016

Agenda:

  • Welcome & introduction (Luco, ~5 minutes)
  • Questions and comments (All, ~10 minutes)
  • Questions and comments (All, ~10 minutes)
  • Concluding remarks (Luco, ~5 minutes)

Participants: 1) Kioumars Afshari, UCLA; 2) Jack Baker, Stanford; 3) Jeff Bayless, AECOM; 4) Jacobo Bielak, CMU; 5) Nenad Bijelic, Stanford; 6) Brendon Bradley, Canterbury; 7) James Dismuke, Canterbury; 8) Jeff Fraser, Canterbury; 9) Rob Graves, USGS; 10) Caroline Holden, GNS Science; 11) Haydar Karaoglu, CMU; 12) Ting Lin, Marquette 13) Nicolas Luco, USGS; 14) Leonardo Ramirez-Guzman, UNAM; 15) Sanaz Rezaeian, USGS; 16) Fabio Silva, SCEC; 17) Andreas Skarlatoudis, AECOM; 18) Jonathan Stewart, UCLA; 19) Ricardo Taborda, Memphis; 20) Farzin Zareian, UC Irvine; 21) Chao Zhang, MTU; 22) Peng Zhong, UC Irvine

Action Items:

  • Further coordinate or integrate the efforts of the GMSV TAG with the SCEC Broadband Platform Group and the SCEC Utilization of Ground Motion Simulation Committee.

December 3, 2015

Agenda:

  • Welcome & introduction (Luco, ~5 minutes)
  • Ground motion variability (Archuleta, ~10 minutes)
  • Questions and comments (All, ~5 minutes)
  • Broadband synthetic ground motion in Mexico: Current approaches and some proposals for Mexico City's building code (Ramirez-Guzman, ~15 minutes)
  • Questions and comments (All, ~5 minutes)
  • Recommendations to further incorporation of simulations into ground motion prediction for engineering applications (Stewart, ~10 minutes)
  • Questions and comments (All, ~5 minutes)
  • Concluding remarks (Luco, ~5 minutes)

Participants: 1) Ralph Archuleta, UCSB; 2) Nenad Bijelic, Stanford; 3) Brendon Bradley, Canterbury; 4) Jorge Crempien, UCSB; 5) Ting Lin, Marquette 6) Taojun Liu, CU-Boulder/USGS; 7) Nicolas Luco, USGS; 8) Kim Olsen, SDSU; 9) Hoby Razafindrakoto, Canterbury; 10) Sanaz Rezaeian, USGS; 11) Jonathan Stewart, UCLA; 12) Peng Zhong, UC Irvine; 13) TBD, ...;

Action Items:

  • TBD


October 21, 2015

Agenda:

  • Recent and near-future GMSV TAG activities (Luco, ~10 minutes)
  • Discussion of 2016 SCEC proposals related to GMSV (All, ~20)
  • Questions and comments (All, ~10 minutes)
  • Concluding remarks (Luco, ~5 minutes)

Participants: 1) Ralph Archuleta, UCSB; 2) Nenad Bijelic, Stanford; 3) Brendon Bradley, Canterbury; 4) Jorge Crempien, UCSB; 5) Ting Lin, Marquette 6) Taojun Liu, CU-Boulder/USGS; 7) Nicolas Luco, USGS; 8) Kim Olsen, SDSU; 9) Hoby Razafindrakoto, Canterbury; 10) Sanaz Rezaeian, USGS; 11) Andreas Skarlatoudis, AECOM; 12) Jonathan Stewart, UCLA; 13) Farzin Zareian; UCI 14) Peng Zhong, UC Irvine;

Action Items:


May-August, 2015

Please see the 2015 Coordination Workshop.


April 2015

conference call was postponed to May in lieu of our presentation at the SSA annual meeting on 4/21/2015


March 3/26/15

Speaker / Presentation Title

  • 1) Nenad Bijelic / Use and validation of simulated earthquakes for the nonlinear performance-assessment of tall buildings considering spectral shape and duration
  • 2) John Anderson / Empirical evaluation of the variance associated with multiple ruptures of a single fault
  • 3) Ricardo Taborda / Evaluation of attenuation models used in physics-based ground-motion earthquake simulation through validation with data and comparisons with NGA


February 2/26/15

Speaker / Presentation Title

  • 1) Domniki Asimaki / Validating site response predictions in deterministic physics-based ground motion simulations
  • 2) Jon Stewart & Kioumars Afshari / Validation of simulated ground motions relative to seismic geotechnical engineering demand parameters
  • 3) Brendon Bradley / Broadband ground motion simulations for the Canterbury earthquakes with nonlinear effective-stress modeling of surficial soils


January 22, 2015

Speaker / Presentation Title

  • Iunio Iervolino / The ReLUIS 2015 project for near-source simulation in Italy
  • Peng Zhong (& Farzin Zareian) / Validation for building code nonlinear response history analysis
  • Sanaz Rezaeian / General Coordination Issues


December 18, 2014

Agenda:

  • Brief overview of current SCEC GMSV projects (Luco, ~5 minutes)
  • Intro to related USGS External Research project "Calibrating synthetic ground motion damage potential through broadband spectral inversion: Collaborative research with Colorado School of Mines and the USGS" (Pei, ~10 minutes)
  • Update on "Methodology for validating median values and aleatory variability of broadband platform ground motion simulations" (Bayless, ~10 minutes)
  • Update on "Near-source broadband ground-motion modeling of the Canterbury aftershocks and implications for assessing engineering metrics" (Holden, ~10 minutes)
  • Questions and comments (All, ~15 minutes)
  • Concluding remarks (Rezaeian & Luco, ~5 minutes)

Notes:

  • Bayless reported that the goodness-of-fit codes will be implemented and verified by early 2015.
  • Stewart suggested to Bayless that he investigate the change in aleatory variability with earthquake magnitude.
  • ...

Participants: 1) Kioumars Afshari, UCLA; 2) Jack Baker, Stanford; 3) Jeff Bayless, URS; 4) Nenad Bijelic, Stanford; 5) Greg Deierlein, Stanford; 6) Steve Hartzell, USGS; 7) Caroline Holden, GNS; 8) Nicolas Luco, USGS; 9) Phil Maechling, SCEC; 10) Ling Pei, CSM; 11) Sanaz Rezaeian, USGS; 12) Jonathan Stewart, UCLA; 13) Peng Zhong, UC Irvine


November 6, 2014

Agenda: The purpose of this web conference was merely to keep everyone in the loop regarding the GMSV-related proposals that were submitted the following day, and to get any last-minute feedback.

Notes:

  • ...

Participants: 1) Kioumars Afshari, UCLA; 2) John Anderson, UNR; 3) Domniki Asimaki, Caltech; 4) Jeff Bayless, URS; 5) Nenad Bijelic, Stanford; 6) Christine Goulet, UC Berkeley; 7) Ting Lin, Marquette; 8) Nicolas Luco, USGS; 9) Sanaz Rezaeian, USGS; 10) Andreas Skarlatoudis, URS; 11) Ricardo Taborda, Memphis; 12) Farzin Zareian, UC Irvine; 13) Peng Zhong, UC Irvine


October 16, 2014

Agenda: The purpose of this web conference was to discuss further (than we did at the SCEC Annual Meeting) any GMSV-related proposals that would submitted in response to the 2015 SCEC RFP.

Notes:

  • ...

Participants: ...


September, 2014

No web conference due to SCEC Annual Meeting. ...


May-August, 2014

Please see the 2014 Coordination Workshop.

April 21, 2014

Agenda:

  • Introduction and summary of outcomes from our previous web conference (Luco, 5min)
  • Current Italian research efforts on GMSV and mid-term goals (Iervolino, 10min)
  • Validation for building-code nonlinear response history analysis (Zareian, 10min)
  • SSA presentation on the progress of the SCEC GMSV TAG (Rezaeian & All, 10min)
  • Discussion (All, 15min)
  • Closing remarks (Luco, 5min)

Notes:

  • ...

Participants: ...


March 20, 2014

Agenda:

  • Summary of outcomes from previous web conference (Luco, ~5 minutes)
  • The upcoming SCEC GMSV Workshops
  • SSA presentation & SRL paper on efforts of the GSMV TAG
  • Our interactions with ground motion modelers and seismologists
  • Concluding remarks (Luco, ~5 minutes)

Summary of Outcomes:

  • Jon Stewart summarized his collaboration with Rob Graves (USGS) that directly led to changes to Graves' ground motion simulation model as a result of Stewart's validation research. This work is published in the following paper:

Seyhan, E; Stewart, J.P.; and Graves, R.W. (2013). "Calibration of a Semi-Stochastic Procedure for Simulating High-Frequency Ground Motions," Earthquake Spectra, Volume 29, No. 4, pages 1495-1519.

  • ...
  • ...
  • ...
  • ...
  • ...


Participants: 1) Kioumars Afshari, UCLA; 2) Jack Baker, Stanford; 3) Carmine Galasso, Newcastle; 4) Haydar Karaoglu, CMU; 5) Ting Lin, Marquette; 6) Nicolas Luco, USGS; 7) Philip Maechling, SCEC; 8) Sanaz Rezaeian, USGS; 9) Jonathan Stewart, UCLA; 10) Peng Zhong, UC Irvine


February 7, 2014

Agenda:

  • Introduction and summary of outcomes from previous web conference (Rezaeian, ~5 minutes)
  • “Housekeeping” and our upcoming events (Luco, ~10 minutes):
  • Update on "Spatial distribution of long period earthquake ground motion in the Kanto Basin." (Bielak, ~10 minutes)
  • Short presentations are welcomed (~10 minutes)
  • Discussion and concluding remarks (Luco & All, ~10 minutes)

Notes:

  • Luco summarized the following upcoming events: i) upcoming monthly web conferences; ii) an in-person coordination workshop curing the week of March 24-28 or April 7-11, if funded; iii) an SSA (April 30 - May 2) presentation; iv) the 10NCEE (July 21-25) session organized by Baker; v) a workshop at the SCEC Annual Meeting (September 7-10), if funded.

Participants: ...


January, 2014

No web conference.


December 18, 2013

Agenda:

  • Summary of outcomes from previous web conference (Luco, ~5 minutes)
  • Discussion on simple validation metrics based on the three presentations above (All, ~10-15 minutes)
  • Discussion on all other topics (All, short presentations are welcomed, ~10 minutes)
  • Concluding remarks (Luco, ~5 minutes)

Summary of Outcomes:

  • Baker & Burks presented a summary of their project that has been completed. They consider three proxies for validation of ground motions. These proxies include 'epsilon', ratio of max direction to median Sa, and inelastic to elastic displacement. They consider two types of validations: comparisons with historical events and comparisons between recorded and simulated motions with similar spectra. They also compare their proxies for simulated motions to the empirical relations they had developed for each proxy in the past.
  • Rezaeian, Zareian, and Zhong are investigating six scalar parameters that are based on evolution of intensity and frequency content of ground motion. The evolution of intensity and frequency content are quantified through three time-dependent validation metrics, six scalar parameters are extracted from these metrics that include Arias Intensity, Duration, Arias Intensity / Duration, t_mid, Frequency at t_mid, and rate of change of frequency in time. These parameters are calculated for simulated and recorded ground motions from Northridge earthquake. Five different simulation models are considered and ranked in terms of closeness of each parameter to those of the recorded motions. Preliminary results are presented as box-plots and scatter-plots for each parameter.
  • Rezaeian, Zareian, and Zhong expressed interest to extend their research to simulations from the Broadband Platform (BBP) project that other GMSV groups are using. They plan to repeat the process for records from earthquakes other than Northridge. It was suggested that this group compare their results to the existing empirical relations for each parameter.
  • Stewart & Afshari presented their ongoing research on validation for duration sensitive systems. They plan to calculate the duration of motion for NGA-West2 database and adjust the empirical model by Kempton & Stewart for duration of motion accordingly. They plan to incorporate mixed-effect regression in their adjustment. Eventually, they will look at a lot of simulations and asses their magnitude and distance scaling for duration by comparing to the adjusted empirical model.
  • Rathje & Peterman presented their findings on the number of stations with Vs30 close enough to the Vs30 used for BBP simulations (863m/s). The error is measured by the ratio of elastic response spectra. The number of stations varies based on the level of acceptable error (10%, 15%, or 20%) and based on the spectral period (e.g., fewer stations available at 1 s). They have made their findings available to the group in the form of an Excel file.
  • The issue of interacting with simulation modelers came up. A few groups mentioned that interaction was necessary to correctly interpret their results. The modelers also have been appreciative of the feedback they received about their simulations, however, given the current resources it is not realistic for them to make changes to their models and issue revisions based on the feedback they receive from every validation group. Perhaps a more organized effort in providing feedback to modelers can be beneficial.


Participants: 1) Kioumars Afshari, UCLA; 2) Jack Baker, Stanford; 3) Jacobo Bielak, CMU; 4) Lynne Burks, Stanford; 5) Greg Deierlein, Stanford; 6) Carmine Galasso, Newcastle; 7) Ting Lin, Marquette; 8) Nicolas Luco, USGS; 9) Breanna Peterman, UT Austin; 10) Sanaz Rezaeian, USGS; 11) Jonathan Stewart, UCLA; 12) Peng Zhong, UC Irvine

November 5, 2013

Agenda:

  • Summary of outcomes from previous web conference, and update on any action items (Luco, ~10 minutes)
  • Discussion of coordination of GMSV efforts for multi-degree-of-freedom nonlinear building systems (All, ~10 minutes)
  • Discussion of SCEC proposals that may be submitted by November 26th (All, ~10-15 minutes)

Summary of Outcomes:

  • Rathje & Peterman are investigating the number of simulated ground motion time series from the Broadband Platform (BBP) validation project that have Vs30 values similar to their recorded counterparts. The simulated time series are all for a reference Vs30 value of 863m/s. "Similar" Vs30 values are being defined as those with minimal site effects for elastic spectral acceleration. Click here for a spreadsheet of the recorded ground motion time series that have Vs30 values "similar" to 863m/s.
  • Zareian & Zhong are collaborating with Iunio Iervolino and Carmine Galasso.
  • Zareian & Zhong are currently developing "Type 2" validation tests (see summary of outcomes from October 9, 2013 web conference) for building-code nonlinear response history analysis. They will also develop "Type 1" validation tests.
  • Zareian & Zhong are applying bootstrapping to quantify the sampling uncertainty in building responses to recorded ground motion time series. Uncertainty from the simulated ground motions is being quantified using the 50 simulation realizations for each historical earthquake from the BBP validation project.
  • Zareian & Zhong are using the Kullback-Leibler distance to quantify the difference between probability distributions of building response to simulated vs. recorded ground motions.
  • Deierlein, Bijelic, & Lin are also developing "Type 2" validation tests for tall buildings with long spectral periods (typically 2 to 6 sec) conditioned on similar response spectra and duration of motion.
  • Deierlein, Bijelic, & Lin are performing Incremental Dynamic Analysis (IDA) to calculate collapse fragility curves for three sets of ground motions. Each set is selected based on different similarity conditions; for more details on the sets, please see the slides they showed during the web conference.
  • Zareian & Zhong and Deierlein et al will compare results of their validation tests and try to explain/resolve differences.
  • The issue of scaling up ground motions vs. "scaling up earthquakes" (to larger magnitudes via simulation) came up.
  • It was discussed that ground motion modelers/simulators should be given the following feedback from the engineering community: work on ground motion variability that results from simulations.


Participants: 1) Kioumars Afshari, UCLA; 2) Jack Baker, Stanford; 3) Jacobo Bielak, CMU; 4) Lynne Burks, Stanford; 5) Greg Deierlein, Stanford; 6) Carmine Galasso, Newcastle; 7) Iunio Iervolino, Naples Federico II; 8) Ting Lin, Marquette; 9) Nicolas Luco, USGS; 10) Breanna Peterman, UT Austin; 11) Ellen Rathje, UT Austin; 12) Sanaz Rezaeian, USGS; 13) Jonathan Stewart, UCLA; 14) Farzin Zareian, UC Irvine; 15) Peng Zhong, UC Irvine

October 9, 2013

Agenda:

  • Discussion of purpose, composition, and scheduling of monthly GMSV TAG coordination web conferences (Luco, ~5 minutes)
  • Discussion of coordination of GMSV efforts for geotechnical systems (All, ~10 minutes)
  • Discussion on whether a coordinated SCEC proposal should be submitted this year (Luco, ~5 minutes)

Summary of Outcomes:

  • Rather than trying to provide updates of all the current projects during each web conference, we will rotate through the projects across months.
  • In addition to 1) a validation test that compares building/geotechnical responses to simulated vs. recorded ground motions for historical earthquakes and station locations, and 2) a validation test that compares responses to simulated vs. recorded ground motions that have substantially similar response spectra (or other ground motion parameters), a third type of validation test is being considered: 3) comparisons between responses (e.g., landslide displacements) or simple ground motion parameters (e.g., duration) from simulated ground motions against empirical prediction models.
  • After completing their "Type 3" validation tests (see above) for significant duration, Stewart & Afshari will develop validation test for either i) landslide displacements, complementing those being developed by Rathje & Peterman, ii) liquefaction, or iii) site response. The choice will be made in coordination with Rathje & Peterman, as well as Asimaki.
  • Rathje & Peterman are focused on developing "Type 1" and "Type 3" validation tests for landslide displacements.
  • For Type 1 validation tests, simulated ground motion time series for site profiles, or at least Vs30 values, similar to those at the station locations are needed. Rathje & Zareian will lead the selection of a subset of simulated time series from the Broadband Platform validation project that already satisfy this condition. Asimaki & Eric Thompson (SDSU) are discussing a proposal to generate such simulated time series for all station locations.
  • Stewart & Afshari are willing to help with adding calculation of significant duration to the Broadband Platform.

Participants: 1) Kioumars Afshari, UCLA; 2) Dominic Asimaki, GA Tech; 3) Jack Baker, Stanford; 4) Jacobo Bielak, CMU; 5) Nenad Bijelic, Stanford; 6) Lynne Burks, Stanford; 7) Carmine Galasso, Newcastle; 8) Iunio Iervolino, Naples Federico II; 9) Ting Lin, Marquette; 10) Nicolas Luco, USGS; 11) Breanna Peterman, UT Austin; 12) Ellen Rathje, UT Austin; 13) Sanaz Rezaeian, USGS; 14) Jonathan Stewart, UCLA; 15) Farzin Zareian, UC Irvine; 16) Peng Zhong, UC Irvine