In this calculation, the following conditions were used: block shape, sphere; density, 2500 kg/m3; diameter, 0.2 m; speed of tailwind, 0 m/s; extent of zone of reduced drag, 0 m; temperature at sea level, 25 °C; and thermal lapse rate, 6.5 °C/km. Compared to some magmatic eruptions, the maximum initial velocity and the maximum distance estimates associated with this eruption are relatively small. Ontake volcanic eruption Japan 2014 On Saturday 27 September 2014, at 11.52am local time, Mt.Ontake, an active volcano on Honshu Island in Japan, erupted without warning. 6. , On January 25, 2017, bereaved families of five victims filed a lawsuit against the country and Nagano prefecture, seeking damages of 150 million yen. 1 September 2020, News “People may say we failed to predict this, but this is something that could not be helped, in a sense. Programme and abstracts, The Volcanological Society of Japan “Supplement: Emergency Academic Session”. TK took aerial photographs and analyzed them with FM. The distribution of ballistics was categorized into four zones based on the number of impact craters per unit area, and the furthest impact crater was located 950 m from the vents. The topographic base map was produced using a GSI map issued by the Geospatial Information Authority of Japan, Appearance of impact craters in each zone. 6). 16 October 2020, Feature The E1 vent located 400 m west of Ohtakisancho peak (Fig. 3c). Based on the time taken to reach a maximum height of approximately 11 km at 12:10 (Sato et al. Sadly 48 hikers died and 69 were reported injured from gas inhilation and impact with rock and ash bound together in pyroclastic flows.  The police said that they were searching for people remaining on the mountain. 2a). 7). In order to mitigate the potential risks posed by similar volcano-related disasters, it is vital to have a clear understanding of the activity status and progression of eruptions. 8 October 2020, News Six people were injured, one by flying rocks. 5a). 5c indicates air-fall ash deposits comprising fine ash particles aggregated with accretionary lapilli (Fig. Based on ballistic models, the maximum initial velocity of the ejecta was estimated to be 111 m/s. The value for the diameter was adopted in reference to the size of the ballistic that hit the Ninoike-Honkan cottage (17 cm, Cabinet Office 2015). Accepted Dec 2015 (in Japanese), Cas RAF, Wright JV (1987) Volcanic successions: modern and ancient. The results showed that there were three large vents in the bottom of the Jigokudani valley on September 28. The distribution of ballistic ejecta was inferred from impact craters, and the furthest impact crater was located 950 m from the vents, although the furthest ballistic was found at the mountain cottage, located 1000 m from the summit. 29 October 2020, Research Spotlight Earth Planet Sp 68, 72 (2016). In this study, the researchers scrutinized a change in tilt observed at two stations beginning about 7 minutes prior to the event. b Topography of Mount Ontake. Immediately after the beginning of the eruption, very few ballistic ejecta were observed around the summit, even though the eruption plume had risen above the summit. On 27 September 2014, around 11:52 hours JST (UTC+9), Mt. Impact craters were identified based on the outline and concave topography suggested by the effect of shading in the photographs. Political.  The government said that the Japan Meteorological Agency had not raised the warning level even though earthquake levels were slightly elevated, because the warning level was based on additional data and historical activity. 2c, 3d), a mudflow was observed on the slope of the pyroclastic cone.  Japanese emergency services often refer to people who show no vital signs, and are apparently dead, as being in cardiac arrest, as legally, only an authorised physician can pronounce a person dead. The diameters of impact craters ranged between several tens-of-centimeters to 1 m, while those of ballistic ejecta ranged from 10 cm to several tens-of-centimeters (maximum c. 1 m). Executive summary A volcanic eruption happened on Mount Ontake which caused over 50 tourist dead in centre Japan on September 27,2014.
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