A numerical study on nearshore behavior of Japan Sea tsunamis using Green’s functions for Gaussian sources based on linear Boussinesq theory

Yamanaka, Yusuke; Sato, Shinji; Shimozono, Takenori; Tajima, Yoshimitsu

doi:10.1080/21664250.2019.1579462

Cited by 14 publications

(7 citation statements)

References 33 publications

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“…The source located at the center of the Pacific Ocean was found to exhibit noticeably larger strength of basin‐wide modes compared to other sources. Yamanaka and Saito (2019) investigated the relationship between the tsunami source geometry and the resonance that occurs during Japan Sea tsunamis. The Miho Bay in western Japan was adopted as an example, where the 1833 Yamagata‐Oki earthquake generated a tsunami that inundated the shoreline.…”

Section: Introductionmentioning

confidence: 99%

Tsunami Resonance Characterization in Japan Due to Trans‐Pacific Sources: Response on the Bay and Continental Shelf

et al. 2021

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The resonant process inside the bay is excited by the arrival of tsunami waves into a semi-enclosed water body. This occurs when the period of tsunami waves is similar to the eigen-period of natural oscillation of the water surface. The excitation and amplification of the natural modes of a bay/harbor can result in a higher run-up on the coast (Allgeyer et al., 2013;Heidarzadeh & Sakate, 2014;Wilson, 1972). The dispersed, high-frequency tsunami energy can excite strong currents inside the bay/harbor, which has an important impact on ships and harbor infrastructure (Okal, Fritz, Raveloson, et al., 2006;Okal, Fritz, Raad, et al., 2006). In addition, the coupling of the shelf resonance and the fundamental oscillation mode of the bay results in even larger coastal hazards (Aránguiz, 2015). For example, such coupling in the Bay of Concepción, Chile, was responsible for large

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Section: Introductionmentioning

confidence: 99%

Tsunami Resonance Characterization in Japan Due to Trans‐Pacific Sources: Response on the Bay and Continental Shelf

et al. 2021

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“…We developed Green's functions for constraining the tsunami source area. Sea surface deformation, expressed as a two-dimensional Gaussian shape, was considered as an initial condition at t = 0, in a similar manner to the work of Yamanaka et al (2019).…”

Section: Analysis Of Green's Functionsmentioning

confidence: 99%

Short-wave run-ups of the 1611 Keicho tsunami along the Sanriku Coast

Yamanaka

Tanioka

2022

Prog Earth Planet Sci

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A tsunami generated by an earthquake that occurred off the east coast of Japan in 1611 was predominantly concentrated along the Sanriku Coast. The 1611 event produced its greatest observed tsunami height at Koyadori, 28.8 m, higher than that produced by other representative tsunamis at the same location such as the 2011 Tohoku and 1896 Meiji Sanriku tsunamis. The characteristics of the source that resulted in the remarkable tsunami height at Koyadori have been widely debated. In this study, we simulated the local intensification mechanism of the 1611 tsunami and derived some key characteristics of the earthquake that produced the intensification at Koyadori based on these results. First, we investigated the topographical inundation characteristics in representative areas on the Sanriku Coast, including Koyadori, by numerical means. By comparing the numerical results with the observed heights for the 1611 tsunami, we found that a simulated tsunami that was dominated by short-wave components yielded a promising reproduction of the observed heights. The development of a local resonance seemed a more likely cause for the observed local intensification at Koyadori than a single-pulse wave. These results suggested that the 1611 earthquake produced a tsunami dominated by short-wave components. Furthermore, the source must have been located far off the Tohoku coast near the Japan Trench axis to have had substantial short-wave components along the Sanriku Coast. Based on these findings, we constructed a source scenario for local intensification by investigating the characteristics of Green’s functions from single-point sources. The scenario involves two separate earthquake sources in shallow crustal areas at the plate interface of the subduction zone, resulting in a moment magnitude of 8.5. The tsunami produced by this source model, which reflected the characteristics of a tsunami earthquake, effectively reproduced the local intensification observed on the Sanriku Coast.

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“…2); the additional water surface deformation due to the co-seismic horizontal displacement of the ocean bottom and the ocean bathymetry are further considered based on Tanioka and Satake (1996b). The propagation of each deformation is then numerically solved based on a linear longwave model in a spherical coordinate system (Yamanaka et al 2019). The computation domain is obtained from bathymetry data from the General Bathymetric Chart of the Oceans (GEBCO) with a 30 arc-sec resolution (Weatherall et al 2015); it has a reflective boundary condition along the shores.…”

Section: Numerical Models For Tsunami Propagation and Inundation Simumentioning

confidence: 99%

“…Page 4 of 14 Yamanaka and Nakamura Earth, Planets and Space (2020) 72:6 In particular, according to Tanioka et al (2018), a normal fault earthquake is capable of generating a substantial dispersive tsunami. Taking the aforementioned into account, a linear dispersive wave model (Yamanaka et al 2019) is also tested for each propagation, although all the selected source models reflected inverse results based on shallow water theory (i.e., nonlinear or linear long-wave models). A high-resolution tsunami inundation simulation is then conducted for Ryori Bay based on a nonlinear longwave model (Goto et al 1997) using a rectangular coordinate system (Fig.…”

Section: Numerical Models For Tsunami Propagation and Inundation Simumentioning

confidence: 99%

“…Yamanaka et al (2013), for example, concluded that the 2011 tsunami formed a standing wave near the bayhead based on the analysis of recorded video footage and the numerical simulation. Yamanaka et al (2019) determined that the standing wave was one of the waves dominated by the bay-scale resonance. In contrast, the peak values of the water surface elevations during the primary waves in the 1933 and 1896 tsunamis at site B were comparable to Page 6 of 14 Yamanaka and Nakamura Earth, Planets and Space (2020) 72:6 that of the 2011 tsunami, whereas their offshore tsunami heights were significantly smaller (Fig.…”

Section: Numerical Models For Tsunami Propagation and Inundation Simumentioning

confidence: 99%

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Frequency-dependent amplification of the Sanriku tsunamis in Ryori Bay

Yamanaka

Nakamura

2020

Earth Planets Space

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In the present study, the local tsunami amplification observed in Ryori Bay, located on the Sanriku coast of Japan, was investigated using numerical simulations. Large-scale tsunami propagation simulations and tsunami inundation simulations for the bay were systematically conducted to estimate and model the 2011, 1933, and 1896 tsunamis that occurred off the Sanriku coast and which resulted in large run-ups. The simulation results, which are moderately consistent with observations, presented larger run-up heights and inundations for the 1933 and 1896 tsunamis (which followed relatively small earthquakes) compared to those of the 2011 tsunami (which followed a larger earthquake). Furthermore, the frequency analysis indicated that the former two tsunamis comprised higher predominant components. A tsunami inundation simulation using parametrized synthetic waveforms was conducted to identify the contributing factors associated with the large amplification and run-ups. The results indicated that the predominant components are significantly amplified in the bay and the initial decrease in the water surface elevation prior to the primary waves of the two tsunamis leads to an increase in their run-up heights. Furthermore, the simulated waveforms of the tsunamis revealed that the 1933 and 1896 tsunamis had their wavefronts changed into a steep wavefront, i.e., a bore-like wave, during their wave developments in the bay, attributed to shoaling, narrowing bay width, and the nonlinear effect of the wave. These results, therefore, indicate that bores which are known to generate large run-up heights were generated in the bay during the two tsunamis.

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A numerical study on nearshore behavior of Japan Sea tsunamis using Green’s functions for Gaussian sources based on linear Boussinesq theory

Cited by 14 publications

References 33 publications

Tsunami Resonance Characterization in Japan Due to Trans‐Pacific Sources: Response on the Bay and Continental Shelf

Tsunami Resonance Characterization in Japan Due to Trans‐Pacific Sources: Response on the Bay and Continental Shelf

Short-wave run-ups of the 1611 Keicho tsunami along the Sanriku Coast

Frequency-dependent amplification of the Sanriku tsunamis in Ryori Bay

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