1996 年 Chimbote-Peru 海啸地震(7.5 级)的数值模拟

IF 2.4 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Cesar Jimenez , Yuchen Wang
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引用次数: 0

摘要

1996 年 2 月 21 日,秘鲁北部地区发生了钦博特地震。尽管震级相对较小,但在 Chimbote 却引发了 2-3 米高的海啸,造成 12 人死亡。我们对 31 个宽带远震站进行了信号处理,并对波形进行了反演,从而获得了滑移分布和震源时间函数。破裂过程持续时间为 70 秒,这对于一个相对较小的地震来说是一个相当高的值。计算出的标量地震力矩为 2.19×1020 Nm,相当于 7.5 级力矩。滑移分布是不均匀的,在 30×30km2 的区域内,主岩体周围的最大滑移量为 8.9 米,约束刚度为 1.46×1010N/m2。我们还计算了 45 个次级断层的垂直共震变形,并将其作为海啸传播模拟的初始条件。计算了 Salaverry(Hmax=0.81 米)、Santa(Hmax=4.62 米)和 Chimbote(Hmax=2.67 米)潮汐站的模拟海啸波形。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Numerical modelling of the 1996 Chimbote-Peru tsunami earthquake (Mw 7.5)

Numerical modelling of the 1996 Chimbote-Peru tsunami earthquake (Mw 7.5)

The earthquake of Chimbote occurred on February 21, 1996 in the northern region of Peru. Despite its relatively small magnitude, it generated a tsunami of 2–3 m height in Chimbote, taking the lives of 12 people. We conducted the signal processing of 31 broadband teleseismic stations, and waveform inversion to obtain the slip distribution and source time function, which indicated a multiple rupture process. The rupture process had a duration of 70 s, a rather high value for a relatively small earthquake. The calculated scalar seismic moment was 2.19×1020 Nm, corresponding to a moment magnitude of Mw 7.5. The slip distribution was heterogeneous, with a maximum slip of 8.9 m around the main asperity concentrated in an area of 30×30km2, for an constrained rigidity of 1.46×1010N/m2. We also calculated the vertical coseismic deformation for 45 subfaults, which was used as an initial condition for the tsunami propagation modelling. Simulated tsunami waveforms were calculated for Salaverry (Hmax=0.81 m), Santa (Hmax=4.62 m) and Chimbote (Hmax=2.67 m) tidal stations.

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来源期刊
Physics of the Earth and Planetary Interiors
Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理
CiteScore
5.00
自引率
4.30%
发文量
78
审稿时长
18.5 weeks
期刊介绍: Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.
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