都市環境リスク学研究室(Urban Environment Risk System Laboratory)-神野教授･重藤助教

本来建物は自然の猛威から我々を守るシェルターの役目を持っていますが、地震の揺れ、すなわち地震動によって、ひとたび倒壊すると、人の命を奪う凶器になります。建物を凶器に変えないためには、建物を地震動に対して強く造るということだけでなく、建物にとっての敵である地震動そのものをよく知ることも重要です。特に地震動は地盤によって大きく変化することが知られていますので、地震動を知るには、地盤の把握がカギとなります。
当研究室では、地下構造のモデル化や地震動シミュレーションなどを通して、構造物に大きな影響を与える特徴的な地震動の成因解明など地震動ならびにそれに大きな影響を与える地盤に関する様々な課題の解決や技術の開発に取り組んでいます。
このような研究では、観測事実から知見を見出すことが重要です。地震観測データは、自分で観測するほか、近年飛躍的に充実した公的な地震観測網のデータを最大限に活用します。また、地震記録だけでなく、交通振動や海の波浪といった様々なものを振動源とする地面の微小な振動（微動）も、実際にフィールドにおいて観測し、利用しています。

Originally buildings have a role of shelter to protect us from the rages of nature. However, when the buildings are destroyed by an earthquake shaking, they become dangerous weapons to kill people. In order not to change the buildings into dangerous weapons, we have to not only build the buildings strongly against the earthquake shaking, but also understand the characteristics of the earthquake ground motions that are the enemy for the buildings. Because earthquake ground motions change greatly depending on the underground structures, it is important to grasp them to understand characteristics of the ground motions.
Based on modeling of underground structures and computer simulation of earthquake ground motions, in our laboratory, we are trying to solve various problems concerning underground structures and earthquake ground motions, such as the elucidation of the cause of severe earthquake motions that have a major influence on the seismic safety of buildings.
In such research, we think that it is very important to find out useful information for understanding characteristics of earthquake motions and underground structures from observed data. We not only use data observed by ourselves, but also observed data provided from the public seismic observation networks which have been dramatically expanded in recent years. In addition, we actually observe microtremors caused by various vibrations, such as traffic vibrations and ocean waves, in the study area, and use them for research.

 

＜主要な研究テーマ：Main Research Topic＞
  • 観測記録に基づく堆積平野の地盤震動特性の評価に関する研究
  • 地震動シミュレーションによる観測された地震動特性の成因解明に関する研究
  • 複数の観測データに基づく地下構造のモデル化手法の開発に関する研究
  • Study on evaluation of site amplification characteristics in sedimentary basins based on observed data.
  • Study on the elucidation of the observed cause of earthquake ground motions using computer simulation.
  • Study on the development of method for underground structure modeling based on various kinds of observed data.