Chronology as an Example of PERT

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  • SHOJI Tetsuya
    Department of Geosystem Engineering, School of Engineering, The University of Tokyo
  • KANEDA Hiroaki
    Department of Geosystem Engineering, School of Engineering, The University of Tokyo

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  • PERT問題としてみた編年
  • PERTとしてみた編年
  • PERT ト シテ ミタ ヘンネン

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Abstract

Stratigraphic units and their boundaries can be compared to activities and events in PERT (Program Evaluation and Review Technique), respectively. When the time of the final event of PERT is defined to be 0, and where the times of the other events (E) and activities (A) are expressed by their absolute values, equations, E1≥A≥E2 and A1≥E≥A2 are reduced. On the other hand, the equations where A and E are replaced with G (geologic unit) and B (boundary), respectively, are sufficient only for conformity relation. When dummy units are taken into account, however, the equations are sufficient for other relations, such as unconformity, intrusion and fault. This treatment enable the application of PERT for the geochronology. Obtained results may give important suggestions in order to check relations among geologic units.

Journal

  • Geoinformatics

    Geoinformatics 7 (4), 257-264, 1996

    Japan Society of Geoinformatics

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