Investigation of site amplification at Ocean Bottom stations in the Japan Trench area for earthquake early warning

分析了S-net海底台站记录的2000多次震级（Mj）≥ 4的地震的强震记录。选择了高质量的记录，并对S-net海底站点的站点放大特性进行了评价。利用相对弱的运动记录（峰值加速度< 50 cm/s/s），在S-ne的所有150个台站检查了线性场地放大特性。研究结果和分析发表在一份同行评审的国际期刊《地球、行星和空间》上。目前，在强震动期间的非线性场地响应特性的评估一直在进行中。一份载有初步分析结果的论文已提交给一份期刊。在学术会议和大会上介绍了结果和分析。

Strong-motion records from more than 2000 earthquakes of magnitudes (Mj) >= 4 recorded at the S-net seafloor stations were analyzed. High-quality records were selected, and site amplification properties at the S-net seafloor sites were evaluated. The linear site amplification properties were examined at all 150 stations of the S-ne using relatively weak-motion records (peak accelerations < 50 cm/s/s). The results and analysis were published in a peer-reviewed international journal of Earth, Planets and Space. Currently, evaluation of the nonlinear site response properties during strong shakings has been ongoing. A paper with the preliminary results of the analysis has been submitted to a journal. The results and analysis were presented in academic meetings and conferences.