REEXAMINATION OF TSUNAMI SOURCE-EFFECT OF HETEROGENEOUS FAULT MOTION ON THE TSUNAMI GENERATION

异质断层运动对海啸产生的海啸源效应的再考察

• 批准号: 03650412
• 负责人: SHUTO Nobuo
• 金额: $ 0.96万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650412/
• 关键词: TSUNAMI SOURCE; FAULT MODEL; HETEROGENEOUS FAULT MOTION; SECONDARY FAULT MOTION; ASEISMIC EVENT; 不均質断属運動; インバ-ジョン; 津波数値解析; 津波計

The standard mechanism of tsunami generation has been explained based upon the fault motion. A tsunami initial profile is given by the sea bottom displacement estimated from fault parameters, on assuming a homogeneous fault plane. This method often gives an unsatisfactory result different from the observed tsunami. The present study aims to examine causes of this difference.The 1983 Nihonkai-Chubu earthquake tsunami is selected as one of examples, for which many evidences and witnesses are available. The effect of the heterogeneous fault motion on the tsunami generation and propagation is discussed in view of the frequency dispersion and the resolution of tide record. In order to satisfy the witnessed tsunami, a secondary fault is necessary for the north fault and aseismic creeping slips on the eastern side of the south fault.As an example of the tsunami generated not by a fault motion, the 1883 Krakatau tsunami is well simulated, on assuming a rapid caldera formation and on developing a method to stabilize the computation at the early stage of computation.

已经根据断层运动来解释海啸产生的标准机制。假设有均匀的断层平面时，由断层参数估计的海底位移给出了海啸初始轮廓。这种方法通常给出的结果与观察到的海啸不同。本研究旨在研究这种差异的原因。鉴于频率分散和潮汐记录的分辨率，讨论了异质断层运动对海啸产生和传播的影响。为了满足见证的海啸，北部断层的北断层和无性爬行滑动是必要的，这是1883年的Krakatau Tsunami所产生的海啸的一个例子，这是一个次要的断层。 ，假设迅速的火山口形成并开发一种在计算早期阶段稳定计算的方法。

项目成果

今村 文彦: "1883年Krakatau島噴火による津波の数値計算" 海岸工学論文集. 39. 226-230 (1992)

Fumihiko Imamura：“1883 年喀拉喀托岛喷发引起的海啸的数值计算”《海岸工程学杂志》39. 226-230 (1992)。

Imamura,F.: "Analysis of the OBS data and numerical simulation for the 1990 Mariana earthquake tsunami" Tsunamis in the world. (1993)

Imamura,F.：“1990 年马里亚纳地震海啸的 OBS 数据分析和数值模拟”世界海啸。

IMAMURA,F.: "Analysis of the OBS data and numerical simulation for the 1990 Mariana earthquake tsunami" Tsunamis in the world.

IMAMURA,F.：“1990 年马里亚纳地震海啸的 OBS 数据分析和数值模拟”世界海啸。

首藤 伸夫: "日本海中部地震津波第1波の発生原因" 地震学会講演予講集. C05- (1992)

修藤伸夫：《日本中部海域地震第一波海啸的成因》日本地震学会初级讲座 C05-（1992 年）。

Kawamata,S., F.Imamura and N.Shuto: "Numerical simulation of the 1883 Krakatau tsunami" Proc. of Japanese Coastal Eng.Vol.39. 226-230 (1992)

Kawamata,S.、F.Imamura 和 N.Shuto：“1883 年喀拉喀托海啸的数值模拟”Proc。