The Deformation of the Earth's Crust in Honzyô and Hukagawa
The Deformation of the Earth's Crust in Honzyô and Hukagawa
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本着和户川的地壳变形
DOI：
10.2183/pjab1912.8.417
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发表时间：
1932
期刊：
影响因子：
--
通讯作者：
N. Miyabe
中科院分区：
文献类型：
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作者：
N. Miyabe
对 1930 年至 1931 年期间基准垂直位移的测量结果显示，东京本座和狐川有一个显着凹陷的区域。该凹陷区域几乎与该区域下方第三纪地层表面特征的山谷以及产生甲烷气体的井区域重合。然而，之前的这些调查是基于军事土地测量部当局安装的基准的垂直位移。另一方面，东京市政当局在本庄和户川分布了 33 个基准点。31 这些基准点的高度，连同军事土地测量部门当局设置的 5 个基准点和重建局当局设置的 4 个基准点的高度，于 11 月 11 日首次测量。 1929年精度达到0.1mm。最近，在Honzyo和Hukakawa进行了精确水准测量的修订，并测量了1929年11月至1932年3月期间上述42个基准点的垂直位移。测得的垂直位移如表1中括号内的数字所示。在用已经提到的方法对基准点垂直位移的现有数据进行分析时，我们注意到有五组基准点，其中四个被认为位于各自的地壳块上，其倾斜方向的大小由图 1 中箭头的方向和长度表示。
The result of measurement of the vertical displacements of the bench-marks due to the interval 1930-1931 revealed a zone of remarkable depression in Honzyo and Hukagawa, Tokyo. This zone of depression was shown to be nearly coincident with a valley in the surface feature of the Tertiary Bed underlying the district and also with the zone of wells yielding methane gas. These previous investigations' were, how ever, based on the vertical displacements of the bench-marks installed by the authorities of the Military Land Survey Department. On the other hand, there are 33 bench-marks distributed in Honzyo and Hukagawa which have been installed by the municipal authorities of Tokyo.31 The heights of these bench-marks, together with those of five bench-marks installed by the authorities of the Military Land Survey Department" and four bench-marks installed by the authorities of the Reconstruction Bureau," were first measured inNov. 1929 with the accuracy up to 0.1mm. Recently a revision of the precise levelling was carried out" in Honzyo and Hukagawa and the vertical displacements of the above mentioned 42 bench-marks due to the epoch Nov. 1929-March 1932 were measured. The vertical displacements measured are shown in Fir. 1. by numerical figures in brackets. On the analysis of the present data of the vertical displacements of the bench-marks by the method already mentioned," we notice five groups of the bench-marks, four of which are regarded as situated on respective crust blocks tilted in the directions with magnitudes repre sented by the directions and lengths of the arrows in Fig. 1. The