Characterisation of the Tohoku subduction fault zone using downhole logging measurements and physical properties data taken on recovered core.

2011年在日本近海发生的东北地震(Mw 9.0)产生了巨大的滑动(约50米)。俯冲带这一部分的巨大位移是地震科学家意想不到的，并引发了一场毁灭性的海啸，夺走了2.3万人的生命，并在本州东北海岸造成了巨大破坏。综合大洋钻探计划(IODP)343考察的主要科学目标是了解大滑动地震的物理机制，目前人们对此知之甚少。从2012年4月1日至5月24日，考察队将在日本近海进行钻探、取心、记录和部署R/V Chikyu的钻孔观测站，这是一个具有重大社会意义的主题，涉及评估未来源自俯冲带的地震造成的严重震动和大海啸。该项目将使用现场井下收集的物性数据和对回收的岩心的测量相结合的方式：帮助准确定位断裂带，描述遇到的地层，并调查区域应力状态。因此，它将直接为这次探险设定的主要目标做出贡献。

The 2011 Tohoku Earthquake (Mw 9.0) off the coast of Japan produced huge slip (~50 metres). The large displacement on this portion of the subduction zone was unexpected by earthquake scientists and produced a devastating tsunami that took over 23,000 lives and caused massive damage along the northeast coast of Honshu. The primary science objective of Integrated Ocean Drilling Program (IODP) Expedition 343 is to understand the physical mechanisms of large slip earthquakes, which at present, is poorly understood. It is a subject of great societal relevance regarding the evaluation of severe shaking and large tsunamis from future earthquakes originating at subduction zones.Between 1 April and 24 May 2012 the Expedition will be offshore Japan drilling, coring, logging and deploying borehole observatories from the R/V Chikyu. This project will use a combination of physical properties data collected in situ downhole and measurements on recovered core to: help precisely locate the fault zone, characterise the formations encountered, and investigate the regional stress regime. Hence, it will directly contribute to the major objectives set out by this expedition.