Thus, a Tokai earthquake has not occurred for more than 150 years since the 1854 Ansei Tokai earthquake. Even though the inflow speed is very large in the channel it should be noted that the speed drops dramatically as it leaves the channel side. Two decades of spatiotemporal variations in subduction zone coupling offshore 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 Tosa, 11,170 houses were washed away, and 18,441 people drowned. Maximum tsunami height along the Pacific coast of Japan. As the height of the sea surface increases with passing time, the width of the channel grows very dramatically (Figures 11c and 11d; T = 24 and 29 min). Figure 9 shows the maximum simulated tsunami heights for the new model along the Pacific coast of Japan in Shikoku and Kyushu. These correspond to ground upheaval areas associated with the Hoei earthquake (Figure 2). The rupture of each subfault takes 5 s. For simplicity, we assumed that the shape of the initial tsunami on the sea surface is identical to the sea bottom deformation associated with the earthquake. Possible slip history scenarios for the Hyuga‐nada region and Bungo Channel and their relationship with Nankai earthquakes in southwest Japan based on numerical simulations. [42] The results of tsunami inundation simulation indicate that tsunami‐related deposits observed in Ryujin Lake do not occur regularly during Nankai Trough earthquakes but occur during unusually large earthquakes when the fault rupture extends beyond westernmost Shikoku to Hyuga‐nada. [9] Following these new findings and supporting instrumental data, we will reexamine the source model for the Hoei earthquake. EFFECT OF TSUNAMI-INDUCED SEDIMENT TRANSPORT AND OFFSHORE TSUNAMI WAVEFORM ON ENLARGEMENT OF RETURN FLOW. Estimated Number of Deaths: 70,000 (in Peru and Chile) Year: 1868 South China Sea (Taiwan) Estimated Number of Deaths: 40,000 Year: 1782 Krakatoa, Indonesia Estimated Number of Deaths: 36,000 Year: 1883 Nankaido, Japan Estimated Number of Deaths: 31,000 Year: 1498 Tokaido-Nankaido, Japan Estimated Number of Deaths: 30,000 Year: 1707 Hondo, Japan 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. From historical records, tsunami heights of 9 m at Tosa Shimizu and Ashizuri Cape and more than 4 m along the coast from Ashizuri Cape to Hyuga‐nada are known to have occurred (shown as circles in Figure 5 [Murakami et al., 1996]). [2003] modified the source model of Aida [1981] and improved the agreement between tsunami simulations and observed tsunami height distributions. At this time, a very large (>5 m/s) flux of seawater flows through the center of the channel. 1707 Hōei Nankai Trough tsunami in the Bungo Channel, southwestern Japan. For example, historical archives document that at Yonouzu village, at the northern end of Hyuga‐nada, the tsunami was more than 10 m and killed 18 people [Chida et al., 2003; Chida and Nakayama, 2006]. We then reexamine the source model of the Hoei earthquake based on recent objective data derived by the geological and geodetic investigations mentioned above. 5 Tokaido-Nankaido Tsunami. Oct 28, 1707. The earthquake occurrence pattern can be characterized by three fault segments: the Nankai, the Tonankai, and the Tokai, from west to east. (a) Speed of water flow at the entrance of the lake (plus indicates inflow, and minus indicates outflow), (b) water height at Ryujin Lake, and (c) shield numbers showing the power of tsunami transportation. Use the link below to share a full-text version of this article with your friends and colleagues. Other source parameters, including strike, dip, rake and slip were assumed to be the same as for the N4 subfault segment (Table 2). This implies that unusually large earthquakes associated with larger tsunamis than usual have struck there during the 1707 Hoei, the 1361 Shohei, and the 684 Tenmu earthquakes. There are many old monuments of the Nankaido tsunamis of Hoei (Oct. 28, 1707) and the 2nd Ansei (Dec. 24, 1854) along the Osaka and Wakayama coasts, Western Japan. [13] Figure 2 illustrates the calculated vertical ground deformation due to fault rupture of the N1 through N4 fault segments for the Hoei earthquake, derived following Mansinha and Smylie [1971]. However, the level of ground subsidence in the area around Ryujin Lake derived by the new model is several times larger than we expected (60 cm). School San Diego Miramar College; Course Title GEOL 101; Type. Nankai, Japan: 1707 Hōei earthquake: Earthquake: On 28 October 1707, during the Hōei era, a magnitude 8.4 earthquake and tsunami up to 10 meters (33 feet) in height struck Tosa Province (Kōchi Prefecture). As time passes, the raised mass of seawater gradually spreads bilaterally as two tsunamis, one propagating toward the seashore and the other to the open ocean at a faster speed. The first recorded tsunami in Japan, it hit on November 29, 684 on the shore of the Kii Peninsula, Nankaido, Shikoku, Kii, and Awaji region. We designated these segments as N4′ and N5′ (Table 2 and Figure 7b). [8] Recent developments of the Japanese GEONET nation‐wide GPS network illustrating the pattern of present ground deformation which is considered to be undergoing recovery process of post‐Nankai Trough earthquake. It is expecting that the rupture of the N5′ subfault segment sometimes occurs by linkage of the N4 Nankai earthquake segment but it does not occurs independently. The Ise Bay tsunamis caused more than 8000 deaths. Snapshots of tsunami propagation from the Kii Peninsula to Kyushu derived from simulation at T = 0.2, 5.0, 15.0, and 30.0 min from the earthquake origin time. Nov 1, 1755. [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). An Account of the Destructive Earthquakes in Japan, Publ. Thus, tsunami runup into Ryujin Lake might occur when the Nankai Trough fault rupture extends to Hyuga‐nada, but not during events like the 1854 Ansei Nankai and 1946 Showa Nankai earthquakes, in which the fault rupture did not extend past the westernmost end of Shikoku. souhaitée]. The Journal of the Geological Society of Japan. Any queries (other than missing content) should be directed to the corresponding author for the article. 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