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Contribution of Slow Earthquake Study for Assessing the Occurrence Potential of Megathrust Earthquakes. These physical constants are assumed from the geology and sedimentation properties of the Ryujin Lake demonstrated by Okamura et al. Thus, further supporting evidence is needed to develop a reliable and detailed source rupture history for the Hoei earthquake. Such deformations of the ground surface associated with large subduction zone earthquakes are known to produce marine terraces by upheaval and onshore lakes by subsidence. The map shows the Pacific coastline of Kyushu and Shikoku with representative locations (squares). souhaitée]. These greater earthquakes produce the largest tsunamis from western Shikoku to Kyushu. 5 Tokaido-Nankaido Tsunami. Other source parameters, including strike, dip, rake and slip were assumed to be the same as for the N4 subfault segment (Table 2). [4] In the recorded history of the Nankai Trough earthquakes the 1707 Hoei earthquake (hereafter called the Hoei earthquake) was the largest shock in modern Japanese history. Ryujin Lake is now locating over an area of large (150 cm) ground subsidence. Nankai earthquake (南海地震) measuring 8.4 hit at 4:19 [local time] there was a catastrophic earthquake on the southwest of Japan in the Nankai area. Thus, the effect of adding the N5′ subfault is only a very minor amplification of the tsunami along the coast from east of Shikoku to Honshu, confirmed by comparing snapshots of Figures 8a and 8b in later time frames (T = 15 and 30 min). A total of nearly 30,000 buildings were damaged in the affected regions and about 30,000 people were killed. 6. [2004] that tsunami inundation carrying sea deposits occurs via a narrow channel connecting the sea and lake rather than by overtopping of beach hills that are 10 m high. The comparison clearly demonstrates the development of a larger tsunami with heights of 5 m to over 10 m over a wide area along the Pacific coast from the westernmost end of Shikoku to Hyuga‐nada due to the N5′ subfault (Figure 8a). However, the height of the simulated tsunami from western Shikoku to Hyuga‐nada in Kyushu is less than half of the actual height observed. It had an estimated magnitude of 7.9 on the surface wave magnitude scale and triggered a devastating tsunami that resulted in thousands of deaths in the Nankai and Tōkai regions of Japan.It is uncertain whether there were two separate earthquakes separated by a short time interval or a single event. [41] On the other hand, the water flux in the center of the channel obtained from the former Hoei earthquake model is less than 1 m/s, which is approximately 1/6 of the maximum inflow and almost same as the outflow current speed for the new Hoei earthquake model. Thus, the Hoei earthquake was not a linkage occurrence of the 1854 Ansei Nankai and the Ansei Tokai earthquakes but a much larger event. Interseismic Coupling‐Based Earthquake and Tsunami Scenarios for the Nankai Trough. The Quaternary Research (Daiyonki-Kenkyu). On tsunami sediment transport modeling and uncertainties津波土砂移動数値解析の不確実性と地形復元について. Dans le cas du séisme de 1707, les séismes semblent s'être produits de manière simultanée, ou du-moins dans une durée de temps trop courte pour pouvoir être distingués par les sources historiques, Annal of Disas.Prev.Res.Inst., Kyoto Univ. Oct 28, 1707. Origin Time of the 1854 Ansei–Tokai Tsunami Estimated from Tide Gauge Records on the West Coast of North America. We worked to match the ground deformation pattern due to the Hoei earthquake and the present ground deformation field shown by the GEONET data, assuming that the significant ground deformation associated with the Hoei earthquake is still influencing the present deformation field. This explains the description in ancient documents of an exceptionally large tsunami approximately 10 m high occurring during the Hoei earthquake [Chida et al., 2003]. Les mégaséismes du chevauchement de Nankai tendent à se produire par pairs, avec un laps de temps relativement court entre eux. Seismicity and structural heterogeneities around the western Nankai Trough subduction zone, southwestern Japan. We compare the simulation results with observed heights of the tsunami along the Pacific coast of the Nankai Trough, especially from western Shikoku to Kyushu [Hatori, 1974, 1985; Murakami et al., 1996]. In this paper, the tsunami monuments are illustrated. The 1707 Mw8.7 Hoei earthquake triggered the largest historical eruption of Mt. However, it should be kept in mind that objective data, such as shaking intensities and tsunami heights in Kyushu, were rather limited at that time and thus, these data may not well incorporated in their analysis. An Account of the Destructive Earthquakes in Japan, Publ. Small Bodies, Solar Systems Location of Ryujin Lake is shown by the triangle. Red arrows denote the speed of the water flow. [24] Following these new findings, we revised the source rupture model for the Hoei earthquake and extended the border of the Hoei earthquake source segments of An'naka et al. Tsunamis and submarine landslides in Suruga Bay, central Japan, caused by Nankai–Suruga Trough megathrust earthquakes during the last 5000 years. Les mouvements tectoniques dans cette zone de convergence lithosphérique sont à l'origine de nombreux séismes, dont certains rentrent dans la catégorie des mégaséismes. Source rupture areas of recent three Nankai Trough earthquake cycles: (a) the 1944 Tonankai and 1946 Nankai earthquakes, (b) the 1854 Ansei Nankai and Tokai earthquakes, and (c) the 1707 Hoei earthquake. [25] We first set a 70 km by 120 km subfault segment, N5, on the west of the N4 subfault segment and extended the source rupture area of the Hoei earthquake to Hyuga‐nada (Figure 7). Damage. [39] Figure 12 shows changes of the water height in Ryujin Lake and the flow speed of water in the entrance of the lake connecting to the channel. The source model also failed to explain the larger tsunami experienced during the Hoei earthquake from Cape Ashizuri to Hyuga‐nada as compared with the tsunami associated with the 1854 Ansei Nankai earthquake. Finally, we simulate the tsunami runup and inundation of Ryujin Lake using a high‐resolution bathymetric model to demonstrate the effectiveness of our new Hoei model in duplicating observed data due to the earthquake and to understand how the tall tsunami generated by the Hoei earthquake transported oceanic sand into Ryujin Lake. Journal of Geomagnetism and Aeronomy, Nonlinear The maximum water depth of the lake is approximately 3 m in the center, and a narrow channel or waterway southwest of the lake connects it to the sea. Le changement de pression causé par un très fort séisme peut être suffisant pour déclencher une éruption volcanique, du fait que le système magmatique impliqué est bloqué à un état critique[5]. The MW 9.0 Tohoku Earthquake, Japan, March 11, 2011. A Method to Determine the Level 1 and Level 2 Tsunami Inundation Areas for Reconstruction in Eastern Japan and Possible Application in Pre-disaster Areas. Séisme de 1707 de l'ère Hōei: Date 28 octobre 1707 à 14 h 00 (heure locale) Magnitude: 8,6 (estimée) Épicentre: 33° 12′ 00″ nord, 135° 54′ 00″ est: Hauteur maximale du tsunami 25,7 m: Régions affectées Honshu, Kyushu, Shikoku: Victimes 5 000 Géolocalisation sur la carte : océan Pacifique. By continuing to browse this site, you agree to its use of cookies as described in our, Journal of Advances 2nd ser.). We used a nested mesh model that connects gradually 30 m, 90 m, and 270 m mesh model to allow efficient simulation of the tsunami in heterogeneous bathymetry (Figure 3). Propagation of tsunami associated with the 1707 Hoei earthquake derived by tsunami simulation using the source model of. [2004] at the Hyuga‐nada seashore in Kyushu, is not in a location typical of other tsunami lakes in Shikoku and Honshu where large ground subsidence is considered to have occurred during Nankai Trough earthquakes. [30] In a later snapshot the larger tsunami is radiating into the Bungo Channel and propagating into the Inland Sea of Japan (Figure 8a; T = 30 min), which enhances the height of the tsunami in the Inland Sea. Journal of Volcanology and Geothermal Research. The C14 age determination for the sedimentation of Ryujin Lake revealed that three sheets of sand layers sandwiched between muddy host sediments were developed during the 1707 Hoei, the 1361 Shohei, and the 684 Tenmu earthquakes [Okamura et al., 2003, 2004]. Organochemical characteristics of carbonaceous materials as indicators of heat recorded on an ancient plate‐subduction fault. Nankaido, Japan (28 October 1707) A magnitude 8.4 earthquake caused seawaves as high as 25 m to hammer into the Pacific coasts of Kyushyu, Shikoku and Honshin. [45] Actually, the source model of An'naka et al. [17] In order to better explain the size of the Hoei earthquake tsunami from Cape Ashizuri to Hyuga‐nada, we revised the present source model of the Hoei earthquake developed by An'naka et al. 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