UTokyo Repository >
131 地震研究所 >
|タイトル: ||紀伊半島の局地地震(第1報) : 和歌山県御坊における小地震の観測|
|その他のタイトル: ||Local Earthquakes in Kii Peninsula, Central Japan : Part 1. Reconnaissance Observation of Minor Shocks at Gobo, Wakayama Prefecture|
|著者: ||宮村, 攝三|
|著者(別言語): ||Miyamura, Setumi|
|掲載誌情報: ||東京大學地震研究所彙報. 第37冊第2号, 1959.8.25, pp. 347-358|
Renewal of the local shock activity in Wakayama Prefecture began again in the second half of 1949. Annual numbers of earthquakes felt at Wakayama from 1880 through 1956 are shown in Fig. 1 which represent the general tendency of seismicity in the region. For the last culmination of the activity some thirty years ago A. IMAMURA executed comprehensive investigations, among which we cannot pass unnoticed his seismological net-work operations and precise level surveys. Although he anticipated the re-occurrence of great Nankaido earthquake like that of 1854, and tried to continue his observation and survey programmes, intending to catch any forerunning phaenomena, eventually should occur before the comming great earthquake. But, various difficulties during the War hindered him from developing his investigations, and at last compelled him to give up his whole plan, when the anticipated great earthquakes attacked the Tokaido and Nankaido regions, adjoining in the Kii Peninsula, successively in December 7th 1944 and December 21st 1946. On the other hand, however, local shock seismicity in Wakayama Prefecture had gradually lowered its activity after 1925, shifting or diverging its center from north to south, and before the Tokaido Earthquake in 1944 number of felt shocks at Wakayama Meteorological Observatory reached a minimum of about 70 per year. After-shock activities of the two great earthquakes, of course, affected the region, but they had ceased in a year or two. After the Nankaido Earthquake of 1946 Hisasi IMAMURA, son of the late Prof. A. IMAMURA, re-opened his station at Kainan City and traced the decline of after-shocks, the statistical treatment of which was reported by F. KISHINOUYE..