抄録
This paper introduces a computer program which compiles a series of repeated levelling data along a route and displays a comprehensive pattern of vertical land movement in the time-space domain. This technique presents us an intuitive view of the dynamic character of the crust. A difficulty for this purpose is faulty data. Surveying intervals are relatively long and not uniform, in general. To make the matter worse, each set is sometimes contaminated by partial missing of data. Therefore, we must take proper interpolation of these faulty portions in order to derive a uniform array of data in the time-space domain. After interpolation, we assign legible symbols to data at each grid point in the domain and draw a two-dimensional chart by use of a computer. A cubic spline function is used for interpolation, assuming that the faulty part of data is represented by a smooth curve in both the time and space-axes.
The program is applied to several examples, in order to demonstrate the usefulness of the present technique. In the charts, we recognize several interesting aspects of strain accumulation. A brief discussion is added on these events from the tectonic viewpoint.
