Temporal variation in crustal structure derived from hybrid analysis of the seismic attenuation and anisotropy

地震衰减和各向异性混合分析得出的地壳结构随时间变化

• 批准号: 21740328
• 负责人: TADOKORO Keiichi
• 金额: $ 2.75万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740328/
• 关键词: 観測手法; 地震波の減衰; 地震波異方性; 地殻構造; 群発地震; 火山; S波偏向異方性; 地殻内流体; 地震; 偏向異方性

We detected a crack structure with high crack density, whose direction is parallel to the epicenter alignment, in the region of the 2009 earthquake swarm at the Hakone volcano.Crustal fluid was included in the above crack structure during the earthquake swarm period. It was suggested that another crack structure was dominant during the period without earthquake swarm. This study presents that crustal structure possibly varies accompanied with occurrences of earthquake swarm.

在2009年箱根火山震群区域发现了一个裂隙密度较高的裂隙结构，其方向与震中走向平行，震群期间上述裂隙结构中含有地壳流体。认为在无震群期间，另一种裂隙构造占主导地位。研究表明，随着震群的发生，地壳结构可能发生变化。