Characteristics of the 2011 Great Tohoku Tsunami on the Russian Far East Coast: Deep-Water and Coastal Observations

Shevchenko, G. V.; Ivelskaya, T. N.; Loskutov, A. V.

doi:10.1007/s00024-013-0727-1

Cited by 20 publications

(5 citation statements)

References 21 publications

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“…The effectiveness of this approach has been demonstrated for many tsunami events (cf. Rabinovich et al, 2013Rabinovich et al, , 2017Shevchenko et al, 2014;Vich & Monserrat, 2009) and was used by Zaytsev et al (2016Zaytsev et al ( , 2017 to examine the spectral properties of the 2010, 2014, 2015 Chilean and 2011 Tohoku tsunamis along the coast of Mexico.…”

Section: Spectral Ratios (Source Function)mentioning

confidence: 99%

The Impact of the Chiapas Tsunami of 8 September 2017 on the Coast of Mexico. Part 1: Observations, Statistics, and Energy Partitioning

Zaytsev

Rabinovich

Thomson

2021

Pure Appl. Geophys.

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The major (M w 8.2) intraplate normal-fault earthquake of 8 September 2017 in the Gulf of Tehuantepec (Chiapas, Mexico) generated a strong tsunami that severely impacted the nearby coasts of Mexico and Central America. Tsunami waves in the near-field area were measured by seventeen high-resolution coastal tide gauges and by three open-ocean DART stations anchored offshore from the affected region. Data from these sites, together with those from four distant DARTs, were used for comprehensive analyses of the 2017 event. De-tided sea level time series were examined to determine the statistical and spectral characteristics of the 2017 tsunami waves along the Mexican and Central American coastline. The characteristics of the recorded waves from this near-field event were compared with those from two great far-field events: the 2010 Chile and the 2011 Tohoku tsunamis. Maximum trough-to-crest wave heights for the 2017 tsunami were recorded at Puerto Chiapas (351 cm), Salina Cruz (209 cm), Acapulco (160 cm), Huatulco (137 cm) and Acajutla, El Salvador (118 cm). While maximum 2010 and 2011 tsunami waves were observed at specific ''hot spots'' (sites with a high Q-factor and pronounced resonant properties, such as Manzanillo and Acapulco), the ''strengths'' of the recorded 2017 tsunami waves were mostly determined by distance from the source. Contrary to the maximum wave heights, the general spectral properties of the tsunami signals for all three events were highly similar at a given coastal site and mainly resemble the spectral structure of background oscillations at the same site. This similarity indicates that the frequency properties of the tsunami waveforms for a steadystate tsunami signal are mainly determined by local topographic features rather than by the source parameters. Estimates of the ''colour'' of an event (i.e., the open-ocean tsunami frequency content) show that the 2017 Chiapas tsunami was mostly ''reddish'' (long-period), with 68% (DART 43413) to 87% (DART 43412) of the total tsunami energy related to waves with periods [ 35 min. In contrast, the 2010 and 2011 tsunamis were ''reddish-blue'', with 48-57% associated with long-period waves ([ 35 min) and 52-43% with short-period waves (2-35 min). The dominant periods of the tsunami waves were mostly linked to the shape, length, and width of the source region: the larger the source and the shallower its depth, the longer the periods of the generated tsunami waves. The complicated structure of the source explains the saturated and wide frequency-band character of the tsunami spectra. Our analysis also reveals an anisotropic nature to the 2017 tsunami waves; waves that propagated northeastward along the mainland coast of North America and southeastward along the Central American coast were significantly different from those that propagated southwestward, normal to the source orientation. This aspect of the wave field appears to be related to two distinct types of waves; ''trapped (edge) waves'' retained on the shelf (which plays the role of a ''wave guide''...

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Section: Spectral Ratios (Source Function)mentioning

confidence: 99%

The Impact of the Chiapas Tsunami of 8 September 2017 on the Coast of Mexico. Part 1: Observations, Statistics, and Energy Partitioning

Zaytsev

Rabinovich

Thomson

2021

Pure Appl. Geophys.

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“…The coseismic excitation of back-arc tsunamis is inherently different from the leakage of tsunamis into such basins from outside sources through narrow opening. The latter mechanism has been previously modeled by Shevchenko et al (2014) for the passage of the 2011 Tohoku tsunami into the Sea of Japan and the Sea of Okhotsk through the Tsugaru and Yuzhno-Kurilsk Straits, respectively (Figure 1). However, this mechanism cannot explain the fact that the back-arc tsunami arrivals at the tide gauges in the Sea of Japan matched the origin time of coseismic rupture, not those of the fore-arc waves arriving much later.…”

Section: Background and Motivationmentioning

confidence: 85%

Excitation of Back‐Arc Tsunamis From Megathrust Ruptures: Theory and Application to the Sea of Japan

Salaree

Huang

2023

JGR Solid Earth

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The 2011 Japan earthquake created a large tsunami in the Pacific Ocean. But it also made a moderate tsunami in the Sea of Japan, on the far side of the Japanese islands. We call these waves Back-arc tsunamis and study their properties by looking at the contributions of various earthquake aspects including earthquake size, depth, fault geometry, and seismic surface waves, to the generation of these tsunamis. Our work shows that contrary to regular tsunamis, the hazard from back-arc tsunamis is affected by the fault dip angle (how steep the fault is). We also find that large earthquakes in eastern Japan can create relatively large back-arc tsunamis (with wave heights exceeding 1 m) in the Sea of Japan.

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“…Although the ordinary (background) oscillations at Nagoya and Toba were frequently observed in the 90–100 min and 36–40 min period bands, respectively, in previous studies (Abe, ; Nakano & Unoki, ), the most energetic tsunami period band was 60–90 min. Along the northeastern Japanese coast and far eastern Russian coast, similar to Ise Bay, the period bands of the most significant tsunami energy were approximately 30, 45, 60, and 90 min (Yamazaki et al, ), and 50–80 min (Shevchenko et al, ) respectively. These periods are derived from the scale of the seismic source features.…”

Section: Discussionmentioning

confidence: 99%

Tsunami Waves and Tsunami‐Induced Natural Oscillations Determined by HF Radar in Ise Bay, Japan

2018

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Tsunami waves and the subsequent natural oscillations generated by the 2011 Tohoku earthquake were observed by two high‐frequency (HF) radars and four tidal gauge records in Ise Bay. The radial velocity components of both records increased abruptly at approximately 17:00 (JST) and continued for more than 24 h. This indicated that natural oscillations followed the tsunami in Ise Bay. The spectral analyses showed that the tsunami wave arrivals had periods of 16–19, 30–40, 60–90, and 120–140 min. The three longest periods were remarkably amplified. Time‐frequency analysis also showed the energy increase and duration of these periods. We used an Empirical Orthogonal Function (EOF) to analyze the total velocity of the currents to find the underlying oscillation patterns in the three longest periods. To verify the physical properties of the EOF analysis results, we calculated the oscillation modes in Ise Bay using a numerical model proposed by Loomis. The results of EOF analysis showed that the oscillation modes of 120–140 and 60–90 min period bands were distributed widely, whereas the oscillation mode of the 30–40 min period band was distributed locally. The EOF spatial patterns of each period showed good agreement with the eigenmodes calculated by the method of Loomis (1975). Thus, the HF radars were capable of observing the tsunami arrival and the subsequent oscillations.

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Characteristics of the 2011 Great Tohoku Tsunami on the Russian Far East Coast: Deep-Water and Coastal Observations

Cited by 20 publications

References 21 publications

The Impact of the Chiapas Tsunami of 8 September 2017 on the Coast of Mexico. Part 1: Observations, Statistics, and Energy Partitioning

The Impact of the Chiapas Tsunami of 8 September 2017 on the Coast of Mexico. Part 1: Observations, Statistics, and Energy Partitioning

Excitation of Back‐Arc Tsunamis From Megathrust Ruptures: Theory and Application to the Sea of Japan

Tsunami Waves and Tsunami‐Induced Natural Oscillations Determined by HF Radar in Ise Bay, Japan

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