-
- YAMADA Juhei
- 東京電機大学
-
- KASAHARA Keichi
- 東京大学地震研突所
Bibliographic Information
- Other Title
-
- 松山における地殻変動連続観測
- マツヤマ ニ オケル チカク ヘンドウ レンゾク カンソク
Search this article
Description
The paper reports long-term tiltmeter observations at the Matsuyama Crustal Movement Observatory, Shikoku, Japan, since 1949, with special reference to the postseismic land movement following the Nankaido earthquake of 1946. The land tilting there has accumulated in a general trend of the NNE-down sense, amounting to 3 sec (in arc) or more in the past twenty-five years. More precisely, the tilt accumulation was almost monotonous in the N-S component, whereas in the E-W component, its sense was reversed from E-down to W-down about 1956-7. These modes of tilting seem to harmonize with the regional land movement as derived from levelling data in the Shikoku district. The sea-level changes at three mareographic stations, Matsuyama, Uwajima and Tosa-Shimizu, all in west Shikoku, suggest slow postseismic movement in the Uwajima-Tosa-Shimizu area. Thus, aseismic local fault slip following the 1946 quake is hypothesized in order to interpret this remarkable effect. Tiltmeters have recorded short-term disturbances of unknown causes, occasionally. Comparison of these events with the sequence of local earthquakes of considerable magnitude (M=3.3-6.6) sometimes indicates chronological coincidence of the two sorts of events. But further investigation must be developed to draw a conclusion. Brief discussion is added on the stability of a float-type water-tube tiltmeter, in which a test observation has been made since 1972 successfully.
Journal
-
- Journal of the Geodetic Society of Japan
-
Journal of the Geodetic Society of Japan 21 (2), 91-97, 1975
The Geodetic Society of Japan
- Tweet
Details 詳細情報について
-
- CRID
- 1390001204067825920
-
- NII Article ID
- 130004189169
-
- NII Book ID
- AN00134900
-
- ISSN
- 2185517X
- 00380830
-
- NDL BIB ID
- 1685856
-
- Text Lang
- ja
-
- Data Source
-
- JaLC
- NDL
- CiNii Articles
-
- Abstract License Flag
- Disallowed