In the early morning hours of December 21, 1946, a M 8.0 earthquake struck off the coast of southern Japan, triggering multiple tidal wives, causing major destruction and death in 15 prefectures, and other damage in a total of 25 prefectures. Mount Fuji erupted 49 days after this earthquake and the Hōei crater was created. Recently, ocean bottom observation using seismometer and pressure gauge successes to document shallow slow earthquakes activity occurring in some subduction zones [e.g., Ito et al., 2013; Yamashita et al., 2015; Wallace et al., 2017]. The last event was the 1946 Nankai earthquake (the Showa Nankai earthquake). Showa Nankai Earthquake / Approx. Authors=NAKAMURA Fujio Journal/Book_names=Programme and Abstracts, the Seismological Society of Japan, Fall Meeting Plate-boundary earthquakes of magnitude 8 or greater along the Suruga–Nankai Trough subduction zone have repeated at intervals of 90–150 years, but with widely varying magnitudes and rupture areas. In addition, the strong measures to be taken after the Tokai Earthquake prediction have become regarded as not appropriate considering the uncertainty of short-term prediction, that is, the The cores has no evidence of tsunami sediment such as Ansei Nankai (M8.4) and Showa Nankai (M8.0) earthquakes. Experts believe there is a 70% to 80% probability of a severe Nankai Trough earthquake within 30 years. The Showa-Nankai earthquake also caused coastal subsidence of at least 0.3 m or more in this area, such that groins built to stand above spring high tides were submerged to about 0.3 m depth at spring tides after the earthquake (Editing Committee of the History of Tokushima Prefecture 1963). The Nankai and Hyuga-nada earthquakes are the assumed large earthquakes in this study. 21 More The magnitude was 8.6, and it triggered a large tsunami. Tōkai, Tōnankai and Nankai earthquakes occurred at the same time with magnitude 8.4–8.6. Slow earthquakes, as defined by anomalously low rupture velocity, reflect a different slip regime than fast faulting of regular earthquakes. The tsunami washed away the building statue of the Great Buddha in Kamakura. DAINA Ken ! Nihonkai Chubu Earthquake / Approx. Nankai Trough earthquakes. Showa Nankai, 1946 Showa Tonankai, 1944 . 50 people / 3 - 5 m. 1983. Simulation of the Great Earthquakes along the Nankai Trough: An Attempt to Simulate Event History, Slip Areas of the Showa Tonankai / Nankai Earthquakes, Heterogeneous Slip Deficit Rate Distribution, and Long-term Slow Slips Fuyuki Hirose1, Kenji Maeda2, Kenichi Fujita1, and Akio Kobayashi1 Thus, it is necessary to analyze and monitor long-term slow slip events in southwest Japan. Publish_year=2007. Along from the Nankai Trough to the Ryukyu Trench, shallow slow earthquake seismicity has been found by some previous studies. Nankai Trouph earthquake occurrence by BPT distribution.png 840 × 450; 17 KB Nankai-Tonankai-Tokai earthquake history.png 500 × 1,660; 442 KB Otani-showa.jpg 2,592 × 1,944; 2.12 MB Chilean Earthquake and Tsunami / Approx. We set characteristic displacement L in 0.05-0.20 m on slip distributions of the Showa Tonankai / Nankai earthquakes and in 7.5 m on regions corresponding to small slip deficit rate distributions. Language_of_Text=JA. The reported causalities of Nankai Earthquake were between 26,000 and 31,000. Tokachi-oki Earthquake / Approx. Earthquake Research Committee (1999):Seismic Activity in Japan Depth Depth Seismic activity of small to middle size earthquakes along Nankai Trough is NOT high . Earthquakes in and around Japan . The Pacific coast of Shikoku district facing the Nankai Trough has suffered major tsunami each time due to a trench type earthquake repeated at 100 to 150 years cycle. Among earthquakes, repeatedly rupturing along the Nankai trough, source of the M8 class Nankai earthquake covers segments from cape Shiono-misaki to cape Ashizuri-misaki, southwest Japan. “Nankai Trough Mega Earthquake Operation Plan” at a glance (This video is in Japanese only.) 2011 ). The Nankai Trough, where the Philippine sea plate is subducting beneath the Eurasian plate, is considered unique because it has a well-investigated recurrence interval and displays rupture zone segmentation of magnitude 8–class earthquakes ().Tsunami wave (2, 3) and seismic wave modeling studies have shown that the slip of the 1944 magnitude 8 Tonankai event propagated across all of … Earthquake . To clarify the characteristics of tsunami duration on the south coast of Shikoku from Nankai trough earthquakes (which consists of four segments: Tokai, Tonankai, and two Nankai segments), numerical tsunami simulations were carried out. Huge Polling Flops in U.S. Election: The ‘Great Blue Wave’ for Biden Never Arrived Nankai (Southern sea) Trough Earthquake The frequency of occurrence of the Nankai Trough Earthquake assumed by this map is 1/1,000years or lower, but if it occurs, Tsushima city will suffer serious damage. Likewise, the height of the 1960 Chile earthquake tsunami was about 1.5 m at the study site (The committee for field investigation of the Chilean tsunami of 1960, 1961 The last two Nankai Trough earthquakes occurred in 1944 (Showa Tonankai earth-quake) and 1946 (Showa Nankai earthquake), as indicated at the bottom of Figure 1. Kouwa-Nankai Earthquake Shohei (Koan) Tokai-Nankai Earthquake Meiou Earthauake Keichyo Earthquake Hoei Earthquake Ansei Tokai Ansei Nankai Earthquake Showa To-nankai- Nankai Earthquake 84 1096 1099 1361 1361 1498 1605 1707 1854 1854 1946 147 Nan kai Tokai by The Headquarters for Earthquake Research Promotion . The Meteorological Agency has launched a system in which it will release information on a much-feared major earthquake in the Nankai Trough off … *Click here if you cannot watch YouTube. 140 people / 5 - 6 m. 1968. The 1944 Tonankai earthquake (M 7.9) and the 1946 Nankai earthquake (M 8.0), the most recent pair, occurred 2 years apart. M≧4.5 . This map takes into account every possible situation in order to hypothesize the largest conceivable earthquake. In contrast to these three tsunamis, the 1946 Showa Nankai earthquake tsunami was only 1.0–1.2 m in height near the study site (Central Meteorological Observatory, 1947). two Nankai Trough Earthquakes, the 1944 Showa Tonankai Earthquake and the 1946 Showa Nankai Earthquake (Figure 1). Publish_Country=Japan. About 70 years have passed since the occurrence of these earthquakes, which is about half the average recurrence interval of a Nankai Trough 100 people / More than 6 m. 1993. 1904~1995 . The area remains seismically active, and future earthquakes are anticipated, with a high risk of a Nankai earthquake in the near future, which could be potentially very damaging. pages=195-202. KAWATA Kazuaki ! To be ready for a national crisis should the Nankai Trough Mega Earthquake occur, we are making every effort to promote various operations. With this background, the GNSS network in Japan has detected transients along the Suruga and Nankai trough subduction zones from approximately 2013, after the 2011 Tohoku earthquake (Ozawa et al. Recent studies of slow earthquakes along plate boundaries have shown that tectonic tremor, low-frequency earthquakes, very-low-frequency events (VLFEs), and slow-slip events (SSEs) often accompany each other and appear to share common source faults.However, the source processes of slow events occurring in the shallow part of plate boundaries are not well known because seismic observations … The last event corresponds to Hoei Nankai Earthquake (M8.6), which tsunami occurred over 10 meters in height attack fisherman’s village, 20km far from the lake. Authors=KUROSAKI Hiromi ! Sea level fluctuation over 12 hours was recorded on tide gauge in Tosashimizu Bay at the time of the 1944 Showa Tonankai Earthquake tsunami. On the irregular tide just before the Showa Nankai earthquake (D31-09)(abs.) The Nankai Earthquake occurred at 08:00 local time of Japan off the coast of Nankaido, Japan on September 20, 1498. Seismic Intensigy Evaluation of the Showa-Nankai Earthquake based on the Experienced Person's Testimony and the Unevenness of Seismic Intensity. Request PDF | On Jan 1, 2013, Atsushi Mikami and others published DAMAGE TO LEVEES DURING THE SHOWA-NANKAI EARTHQUAKE | Find, read and cite all the research you need on ResearchGate 1,400 people / 4 - 6 m. 1960. Considering that average MURAKAMI Hitoshi. NAKANO Susumu ! About 20,000 people were killed and 60,000 houses collapsed, the Tosa area was affected by the tsunami. The Earthquake Research Committee announced in May 2013 that the chance of a quake of magnitude 8 or more happening in the Nankai Trough within 30 years was between 60 and 70 percent. On the other hand, the Hoei earthquake had a seismic-b.eq similar to those of the Showa earthquakes. We propose, based on geologic data on crustal movements of the forearc wedge, that these earthquake variations are controlled by two separate locked zones in the deeper part of the plate … number=22. Earthquake and Tsunami Scenarios as Basic Information to Prepare Next Nankai Megathrust Earthquakes Takane Hori † Japan Agency for Marine-Earth Science and Technology 3173-25, Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan † Corresponding author The seismic-b.eq of the Ansei-Nankai earthquake also seems to have been different from and was located further north than that of the Showa-Nankai earthquake. Besides limited instrumental data of seismic waves and tsunami, distribution of ground shaking (seismic intensity) and tsunami heights (4–9 m) were documented. In the recent Showa-Nankai earthquake occurred in December 1946, there were severe damage such as 1,330 casualties, 11,591 houses in complete destruction, 2599 buildings burned, 2,991 vessels damaged and destroyed. 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