2008; Goto et al. Click on a circle to get the depth of that fault segment.). in history. For example, UC‐2 resembles UA‐2 and UC‐3 resembles UA‐3; however, UC‐1 is similar to UB‐1 but not to UA‐1 with respect to sedimentary facies. for reactor #4 may be among the most disconcerting for scientists. Thinning at a horizontal scale of a few hundred to a few thousand meters is attributed to a landward decrease in sediment supply and current velocity (Hiscott 1994; Choowong et al. 2009) and their inundation area (MacInnes et al. Low coseismic friction on the Tohoku-Oki fault determined from temperature measurements. At C7, the tsunami deposit is 13cm thick and consists mainly of medium to fine sand. Occasionally, these units are bounded by internal erosional surfaces characterized by abrupt changes of grain size and sedimentary structures. 4a). In some places, the slippage along the fault was as large as 30 meters (100 feet), shown by red-shaded areas. It's well known that after an earthquake, Earth's crust continues settling into its new position.

The tsunami deposit, which overlies the 2011 surface soil with an erosional boundary, consists mainly of well‐sorted medium to fine sand, and is often accompanied by shell and plant fragments, gravel, and mud clasts. Ida, Y. The great Tohoku earthquake has everyone, seismologists included, wondering where the next blow will come from. The great 2011 Tohoku-oki earthquake (Mw 9.0), one of the greatest earthquakes recorded by modern instruments, occurred in a megathrust zone formed by the subducting Pacific plate and the overriding Okhotsk plate (Fig. Parallel laminations are apparent between 7 and 14 cm from the bottom. Mud clasts are scattered around 8 cm from the bottom along with a small amount of plant fragments. The 2011 tsunami deposits on the Sendai Plain also tend to thin landward (e.g. Journal of Geophysical Research 77:3,796–3,805, https://doi.org/10.1029/JB077i020p03796. 2004; Morton et al. 4a). Thus, the vertical sequence of the tsunami deposit possibly records temporal changes in hydraulic conditions of the inundation flow. In the coastal forest, the tsunami deposit ranges in thickness from 2 to 35 cm (mean 17.4 cm). [ How Japan's 2011 Earthquake Happened (Infographic )]. Follow us, Facebook  &. The basal erosional surfaces and well‐developed parallel laminations suggest an influence of strong flows. Given their value in future disaster prevention in coastal areas, tsunami deposits have been studied around the Pacific rim (e.g.