资源环境科技发展态势分析平台

We determined the slip distribution of a slow-slip event (SSE) off the Boso Peninsula, Japan, from ocean bottom pressure gauge (OBP) observations. Most large SSEs occur under the ocean, and continuous OBP measurements have been used previously for their detection. These measurements require removing oceanic changes by subtracting averaged data of multiple stations from each OBP data set, a method that requires multiple stations. We developed a new method for extracting transient deformation due to a targeted event from data of a single OBP station. We fit a model that takes account of linear trends, seasonal variations, and other effects to the OBP data to detect transient deformation during the 2014 Boso SSE. We determined the OBP observation accuracy to be 10mm and detected 20mm of uplift which was objectively confirmed by using Akaike's information criterion. Our method improves the potential for measuring slip distributions of SSEs under the ocean.