Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Kagohara, Kyoko*; Imaizumi, Toshifumi*; Miyauchi, Takahiro*; Sato, Hiroshi*; Uchida, Takuma*; Echigo, Tomoo*; Ishiyama, Tatsuya*; Matsuta, Nobuhisa*; Okada, Shinsuke*; Ikeda, Yasutaka*; et al.
Chigaku Zasshi, 115(6), p.691 - 714, 2006/12
The eastern marginal fault zone of the Yokote Basin is one of seismogenic reverse faults developed in Northeast Japan, generating the 1896 Riku-u Earthquake (M7.2). We discussed the relationship among fault traces, geomorphic displacements and fault geometries on the Senya fault, based on a data from high-resolution seismic reflection profiling, investigations in tectonic geomorphology and structural geology, with the help of the balanced cross section method. By the restoring the balanced cross sections, the horizontal shortening amount is estimated to be totally 3 km through the thrust system, and the thrusting is retroactive to 2.4 Ma. Depending on the strike of fault traces and the morphotectonic features, the Senya fault is subdivided into three, the northern, central and southern portion. The initiation of thrust front migration is ca.1.6 Ma at the central portion and 0.6 Ma at the northern portion. This means that the central portion preceded the northern portion as an emergent fault, and suggests that the initial propagated fault extends from the fault end to the boundary fault.
Tomioka, Yutaka*; Saigusa, Moriyuki*; Nakajima, Nobuo*; Osawa, Yasutaka*
PNC TN251 77-13, 32 Pages, 1977/05
The transport behavior of trace-amount of radio nuclides such as I and Cs (Cs) in sodium have been studied on both conditions of normal sodium-steam reaction and sodium burning brought by excess steam supplying. trapping of these radio nuclides transported into gas phase in gas bubbler or scrubber, which is a component of waste gas treatment system, was also discussed. main experimental results were as follows: (1) under the normal sodium-steam reaction, partition ratio of Cs trans-ported into gas phase was 410, while those of I and Na were one hundred times smaller than that of 134cs. Chemical forms of Cs and I transported into gas phase were estimated to be cesium hydroxide and inorganic iodine such as nai, respectively. (2) when the sodium burning occurred by excess steam supplying, partitionratios of Na, I increased 250500 times larger than those under the normal sodium-steam reaction, while for Cs, it increased about 25 times larger than that under normal reaction. sma