深さが負にならない震源決定

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書誌事項

タイトル別名
  • Hypocenter Determination with Non-negative Depth
  • フカサ ガ フ ニ ナラナイ シンゲン ケッテイ

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抄録

Some techniques used in statistics, such as the variable change method, the penalty function method and the gradient projection method, are introduced to determine the location of a hypocenter with a definitely non-negative depth. Numerical simulations are carried out to compare the efficiency of them by using synthetic arrival time data for a four-station seismic array. They demonstrate that the penalty function method with a proper weight is the most efficient. However, if we take an improper weight, it may lead to a negative depth or an invalid solution. Since the variable change method and the gradient projection method do not have such arbitrariness, those can be implemented more easily into hypocenter determination processes operated routinely. The demonstration with real arrival time data shows that the variable change method as z=h2 has practical efficiency.

収録刊行物

  • 地震　第２輯

    地震　第２輯 42 (3), 325-331, 1989

    公益社団法人 日本地震学会

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