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

2011年东北地震（Mw9.0）在日本海岸附近产生了巨大的滑动（约50米）。俯冲带这一部分的大位移出乎地震科学家的意料，并产生了一场毁灭性的海啸，夺走了23，000多人的生命，并对本州东北海岸造成了沿着的巨大破坏。综合大洋钻探计划（IODP）第343次考察的主要科学目标是了解大型滑动地震的物理机制，目前对此了解甚少。这是一个对未来俯冲带地震引起的剧烈震动和大海啸进行评估的具有重大社会意义的课题。2012年4月1日至5月24日期间，考察队将在日本近海进行钻探、取芯、测井，并从R/V Chikyu部署钻孔观测站。该项目将使用井下现场收集的物理特性数据和对回收岩心的测量相结合，以帮助精确定位断层带，识别遇到的地层，并调查区域应力状况。因此，它将直接促进这次考察所确定的主要目标。

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.