Successfully Sampled the Plate Boundary Fault Zone, Japan Trench Fast Drilling Project
On May 21, 2012, the science team aboard the Deep Sea Scientific Drilling Vessel Chikyu has successfully recovered the rock sample, 'JFAST-17', from the Japan Trench plate boundary fault zone at the depth of 821.5 to 824.0 m below the seafloor (6889.5m water depth). 2012年5月21日、JAMSTEC地球深部探査船「ちきゅう」に乗り込んだIODP第343次研究航海「東北地方太平洋沖地震調査掘削」の国際研究チームは、太平洋プレートが北米プレートに沈み込む日本海溝の海底下821.5～824.0 m（水深6889.5m）から、プレート境界断層のサンプル採取に成功しました。 IODP Expedition 343: Japan Trench Fast Drilling Project (JFAST), from 1 April to 24 May, 2012 is to reveal the frictional properties of the plate boundary fault which caused the 2011 Tohoku Earthquake and the associated tsunami. The drill site was offshore Ojika Peninsula, Miyagi Prefecture, where a large displacement of the seafloor during the earthquake was inferred from the previous research. In this location, the science team conducted logging-while-drilling (LWD) to the depth of the plate boundary to obtain physical properties of the formations and successfully recovered the rock samples from the depth of 648 m to 844.5m across the fault zone. New Milestones: -Greatest total depth below sea-level for research borehole (6889.5 meters water depth + 850.5 meters borehole = 7740 meters) -Deepest research core sample below sea-level (7734 meters below sea-level) -First time Japan Trench plate boundary sampled -Deepest fault sampled For expedition ...
Теги: プレート境界断層 Plate Bounday Fault Zone JAMSTEC 海洋研究開発機構 IODP CDEX 地球深部探査センター ちきゅう Chikyu 東北地方太平洋沖地震 The 2011 off Pacific coast of Tohoku Earthquake 津波 Tsunami 日本海溝 Japan Trench 科学掘削 Scientific Ocean Drilling
