INFORMATION FOR PARTICIPANTS OF SS (March19, 1998)

DATABASE CD-ROM FOR SS IS UNDER CONSTRUCTION. WAIT A MOMENT.

(1)Purpose of the simultaneous simulation (SS)
To compare each other the simulated synthetics submitted by numbers of participants from all over the world for Kobe and Northridge earthquake as examples, to understand the key parameters for quantitative prediction of strong ground motions, and to find future directions of research related to the ESG study and strong motion prediction.

(2)Rules of SS for Kobe
Data collected and prepared for this SS project by the organizer will be open to anybody who wants to participate SS. The digitized figures will be placed on the Web of ESG98 and printed forms of them will be mailed upon request only to those who have strong difficulties to access the Web. All the strong motion records for this SS project will be mailed to you by CD-ROM once you register.
The target sites at which participants are requested to calculate their own synthetics will be specified by the organizer. Only some of them have strong motion records either mainshock or aftershocks, which will be provided to you. Among the target sites six will be in Kobe and six in Osaka --go to RULE->. To submit mainshock synthetics at these target sites is mandatory, while to submit mainshock synthetics at other sites or to do aftershock synthetics are optional.
There is no restriction on the method to be used. Thus you can calculate synthetics solely based on a theoretical model of source, path, and site, or you can do using the observed rock-site records as a reference. You need to submit a paper which describes the methodology, assumptions, and the calculated results. If you will use a complex rupture process inverted from the observed seismograms, we recommend to use one of the well-constrained inversion results which will be shown on the Web.

(3)Available data

• Observed strong motion records

  
  
  • a)Earthquakes (JST)
    • i) Mainshock 1995/1/17 05:46
    • ii) Aftershock 1995/1/17 07:38
    • iii) Aftershock 1995/2/02 16:19
    • iv) Aftershock 1995/2/18 21:37
  • ˇˇb)Supporting agencies and their sites
    • i) JMA
      
      • Kobe
        
      • Osaka
        
    • ii) Kobe City
      
      • Port Island
        
    • iii) Osaka Gas
      
      • Fukiai
        
    • iv) Kansai Electric Power Co.
      
      • Osaka Nanko P/S
        
      • Shin-Kobe S/S
        
      • Shingi S/S
        
      • Research Institute
        
      • Takasago S/S
        
      • Yao S/S
      • Minami Osaka S/S
      • v) Sekisui House
      • ˇ¦Rokko Island
      • vi) CEORKA
      (ˇ¦Under negotiation for their 11 stations)
• Ground data
  • a)Deep basin structure
    • A reference model of the deep Osaka basin which can be represented by smoothed spline curves compiled by Mr. Kagawa will be provided.
  • b)Shallow surface layers
    • Reference models at the target sites will be compiled and distributed by the organizer. Information on other strong motion sites will also be provided if the supporting agencies let us distribute.
• Source information
  • a)Mainshock source process
    • The inversion result of a complicated source process of the mainshock derived by Sekiguchi et al. (DPRI, Kyoto Univ.) will be provided as a reference model.
  • b)Aftershock locations and source parameters
    • The locations of target aftershocks determined by Katao et al. (DPRI, Kyoto Univ.) and source parameters determined by Nakagawa and Iwata (DPRI, Kyoto Univ.) will be provided.
• References
  • List of selected papers relevant to the SS project will be provided on the Web.

(4)Output to be submitted

• a)Synthetics
  • Synthetics waveforms both as acceleration and velocity. The format of them will be specified by the organizer (normal ASCII file either PC or Macintosh).
• b)Questionary
  • To make the organizer easy to classify the submitted results, we will ask you to fill a form of questionary on the methodology and the assumptions used for simulation.

(5)Schedule
Figures and rules on Web: 97/8/31 to 97/11/30 (UNDER CONSTRUCTION)
Start of data distribution: 98/11/30 (by CD-ROM) (UNDER CONSTRUCTION)
Deadline of registration: 98/1/31 (by an e-mail)
Deadline of simulated motions: 98/7/31 (by a floppy)
Deadline of papers: 98/8/31

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(6)Northridge case
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SS Northridge case was dropped from the official ESG98 project.

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As for the Northridge case the SCEC project of the Northridge SS inside the U.S. seems to need time to finish more than expected and so the data for Northridge have not been compiled yet. We are trying to find another way to compile available data for Northridge in time. Please register as participants and watch our Web if you are interested in the Northridge case.