旧逢坂山トンネル内の地殻変動の長期観測とその異常の推算

Abstract

The extensions have been observed in the directions of S 38 W, S 52 E and the vertical atthe old Osakayama tunnel for long years. The simple and plain method have been devised inorder to estimate the present anomalies of these observed crustal strains.These standard secular changes are shown as follows, where T is year, S 38 W: (425.1-1.6T 1-660.6 log T-97.52T)x10 8, from Jan. 1, 1951, S 52 E: (-160.l-2.6T 1-1952.9 log T+398.21T)x10 8, from Jan. 1, 1960, The vertical: (19.3+2.0T 1-567.3 log T-93.09T)x10 8, from Jan. 1, 1970.Then, relations between the monthly anomalies from these standard secular change and themonthly and daily precipitations and the monthly water-level have been studied.