Investigating the Magma System of the Active Rabaul Caldera

研究活跃的拉包尔火山口的岩浆系统

• 批准号: 12573005
• 负责人: MORI James Jiro
• 金额: $ 8.19万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12573005/
• 关键词: Rabaul Caldera; volcano, earthquake.; New Ireland; New Britain; Wetin fault; Radiated Energy; Earthquake Sources; Earthquake Moment; Weitin Fault; Weitin fault

The specific investigations of this project include a three-dimensional study of the P-wave velocity structure of Rabaul Caldera which identifies a large magma body in the under the central area of the caldera that is the likely source for the recent historic eruption. Using P arrival time data from both natural earthquakes and explosions from the Rabaul Earthquake Location and Caldera Structure (RELACS) experiment, we were able to image a low-velocity body in the body of the caldera that is the likely a large magma body (Tanimura and Mori).During the course of this study a great (Mw8.0) earthquake occurred on the transform fault east of Rabaul in the New Ireland area (Weitin-Kamdaru fault). The earthquake caused strong shaking in Rabaul and Kokopo, along with a 1 m tsunami in Rabaul Harbour. On New Ireland, which is very sparsely populated, there were observed surface offsets of the fault as large as 5.5 m. We wrote reports about the 2000 New Ireland Earthquake with a description of the earthquake (Itikarai) and a study of the earthquake source and subsequent triggering of two subsequent large earthquakes along the New Britain trench (Park and Mori).

该项目的具体调查包括对拉鲍尔火山口P波速度结构的三维研究，该研究确定了火山口中央区域下方的一个大型岩浆体，这可能是最近历史性喷发的来源。利用天然地震的P到达时间数据和拉鲍尔地震定位和火山口构造(RELACS)实验中的爆炸，我们能够在火山口体内成像一个低速物体，它很可能是一个大型岩浆体(塔尼穆拉和森里)。在本研究过程中，在新爱尔兰地区拉布尔以东的转换断层(魏廷-坎达鲁断层)上发生了一次8.0级大地震。地震在拉博尔和科科波造成强烈震动，拉博尔港发生1米高的海啸。在人口非常稀少的新爱尔兰，观测到的断层地表偏移量高达5.5米。我们写了关于2000年新爱尔兰地震的报告，描述了那次地震(Itikarai)，并研究了地震源和随后沿新不列颠海沟(Park和Mori)随后触发的两次大地震。

项目成果

K.Sato,J.Mori: "Strong Motion Recordings in the Izu Islands, Japan : Observations of Earthquake Initiations"Eos, Transactions, American Geophysical Union. 81. F885 (2000)

K.Sato，J.Mori：“日本伊豆群岛的强震动记录：地震发生的观测”Eos，交易，美国地球物理联盟。

J.Mori,K.Sato,T.Shibutani: "Large Long-Period Earthquakes from Miyakejima Volcano Recorded at Kouzu Island"Eos, Transactions, American Geophysical Union. 81. F904 (2000)

J.Mori、K.Sato、T.Shibutani：“Kouzu 岛记录的三宅岛火山大长周期地震”Eos，交易，美国地球物理联盟。

Park Sun Cheon, Mori J. Jiro: "Possiblity of triggering mechanism in three major Papua New Guinea earthquake in 2000"Programme and Abstracts The seismological society of Japan. Fall Meeting. 120 (2002)

Park Sun Cheon、Mori J. Jiro：“2000 年巴布亚新几内亚三场大地震触发机制的可能性”计划和摘要 日本地震学会。

Takuya Tanimura, MORI James: "Seismic Tomographic imaging of the subsurface structure of Rabaul volcano"Japan Earth and Planetary Science Joint Meeting. S053-P019.

Takuy​​a Tanimura、MORI James：“拉包尔火山地下结构的地震层析成像”日本地球与行星科学联席会议。

PARK, Sun Cheon, Mori, J.Jiro: "Possiblity of triggering mechanism in three major Papua New Guinea earthquake in 2000"(社)日本地震学会講演予稿集 2002年度 秋季大会. 120 (2002)

PARK, Sun Cheon, Mori, J.Jiro：“2000 年巴布亚新几内亚三次大地震触发机制的可能性”，日本地震学会 2002 年秋季会议论文集 120（2002）。