The Meteorological Research Institute reproduced wave movements with a supercomputer, using data on water pressure captured in the seabed observation network off the Tohoku region.<\/p>\n
The analysis showed that the tsunami initially travelled across the Pacific Ocean and reached the coast of South America, about 15,000km away from the quake\u2019s epicentre. <\/p>\n
The waves then bounced off the coast and travelled back towards Japan via the Pacific.<\/p>\n
The rebound tsunami waves are projected to have reached Japan about 48 hours after the earthquake, when tsunami warnings and advisories had been lifted. <\/p>\n
In fact, 0.6m-high waves were observed in Kamisu, Ibaraki prefecture, and Kuji, Iwate prefecture, in the morning of August 1. <\/p>\n
The agency found that the tsunami could not be reproduced in an analysis that assumed there was no South American continent, only ocean.<\/p>\n
Tsunami advisories are issued when waves are projected to be at least 0.2m high and are expected to cause damage.<\/p>\n
\u201cAt that time, the public was fully aware that [the] tsunami had been observed. As we concluded that there was no risk of damage, we did not issue another advisory,\u201d a Meteorological Agency official said.<\/p>\n
In 1960, a tsunami caused by a magnitude 9.5 earthquake off the coast of Chile reached Japan in about 22 hours and left more than 100 people dead or missing.<\/p>\n
\u201cTsunami can arrive far later than the first tsunami waves,\u201d said Hiroaki Tsushima, a chief researcher at the Meteorological Research Institute. <\/p>\n
\u201cThe public should be more aware when it comes to disasters and be prepared for a similar earthquake.\u201d<\/p>\n
Sign up to Herald Premium Editor\u2019s Picks<\/a>, delivered straight to your inbox every Friday. Editor-in-Chief Murray Kirkness picks the week\u2019s best features, interviews and investigations. Sign up for Herald Premium here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"The Meteorological Research Institute reproduced wave movements with a supercomputer, using data on water pressure captured in the…\n","protected":false},"author":2,"featured_media":222527,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[1443,3225,74,3119,18086,12587,8133,95,8604,11551,14995,1759,20706,685,9933,19476,120,20699,4988,3180,111,139,69,6662,48375,8206,20488,133509,1518,8105,20701,147,1240,20705,1361,20702,379],"class_list":["post-222526","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science","tag-about","tag-according","tag-after","tag-agencys","tag-alerts","tag-america","tag-analysis","tag-and","tag-caused","tag-hours","tag-institute","tag-japan","tag-kamchatka","tag-last","tag-later","tag-lifted","tag-likely","tag-magnitude","tag-meteorological","tag-near","tag-new-zealand","tag-newzealand","tag-nz","tag-off","tag-peninsula","tag-quake","tag-reached","tag-rebounded","tag-research","tag-russia","tag-russias","tag-science","tag-south","tag-struck","tag-that","tag-tsunami","tag-year"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/222526","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/comments?post=222526"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/222526\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media\/222527"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media?parent=222526"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/categories?post=222526"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/tags?post=222526"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}