著者

寺島 敦

出版者

公益社団法人 日本地震学会

雑誌

地震 第2輯 (ISSN:00371114)

巻号頁・発行日

vol.43, no.2, pp.189-198, 1990

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It gives us one of the fundamental informations for the counterplan of earthquake disaster prevention to survey how inhabitants faced with strong earthquake motions behave differently, in the regions of high and low seismicities. This study is done by questionnaire about the matter mentioned above. The survey region with low seismicity is the area effected by strong motions of the earthquake (May 30, 1984, <i>M</i>: 5.6) which occurred in the southwestern part of Hyogo Prefecture. The surveys in the cases of Ohita earthquake (April 21, 1975, <i>M</i>: 6.4) and Off Miyagi Earthquake (June 12, 1978, <i>M</i>: 7.4) were already done by OMOTE and MITSuNAMI (1976) and OMOTE <i>et</i> <i>al</i>. (1980), for the regions of high seismicities, respectively. The findings of their papers are referred to the present paper to compare their findings with the results of the current questionnaire. The results are as follows: Responding to JMA intensity scale 5, one hundred percents of the inhabitants in the region of low seismicity act involuntarily and instinctively, while onle 10% of those in the region of high seismicity do so. The findings suggest that the inhabitants in the region of low seismicity are apt to cause secondary disasters such as panic, fire and the like, at lower seismic intensity than those in the region of high seismicity.

著者

寺島 敦 大竹 政和 小沢 邦雄

出版者

公益社団法人 日本地震学会

雑誌

地震 第2輯 (ISSN:00371114)

巻号頁・発行日

vol.28, no.3, pp.239-267, 1975-10-10 (Released:2010-03-11)

参考文献数

10

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Recently, it is suggested that underground water plays an important part in generating the earthquakes. Studies are made in the present paper on changes in flow rate, temperature and heat capacity of hot springs distributed in southern Izu peninsula. These changes are considered to be related closely with the change of underground water caused by the Izu-Hanto-Oki (off the Izu peninsula, Japan) Earthquake (138°48′E, 34°34′N, h: 10km, M=6.9, May 9, 1974).Both of the flow rate and temperature of these hot springs were found to be increased just after the earthquake.Increases of flow rate and heat capacity discharged in the Shimogamo spa contiguous to the epicentral area began about 5.7 years before the earthquake. This abnormality reverted just before the earthquake. This period of about 5.7 years fit the period of precursory phenomena prior to the occurrence of the earthquake M=6.9 expected by “Dilatancy Model”. Moreover, the behavior of the variation bears a close resemblance to what is expected for the behavior of underground water as precursory phenomena prior to earthquakes by “Dilatancy Model”.

著者

寺島 敦子

出版者

静岡県立大学国際関係学部

雑誌

国際関係・比較文化研究 (ISSN:13481231)

巻号頁・発行日

vol.11, no.1, pp.305-324, 2012-09

著者

寺島 敦 松本 利松

出版者

公益社団法人 日本地震学会

雑誌

地震 第2輯 (ISSN:00371114)

巻号頁・発行日

vol.37, no.1, pp.81-88, 1984-03-25 (Released:2010-03-11)

参考文献数

11

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In June and August of 1980 two separate swarms of microearthquakes occurred in the proximity of the Tavera Reservoir, Dominican Republic. The earthquakes were located along the Tavera Fault that runs through Tavera Reservoir. These swarms were observed after abrupt changes of water level occurred. A gradual increase of water level during the period of September through November, however, did dot produce induced earthquakes except sporadic events despite the fact that the highest water level surpassed the peak elevations of two abrupt changes. It was inferred from these observations that the induced seismicity was sensitive to the abrupt changes, especially a rapid draw-down of water level rather than or in addition to the water level itself. The foci of the second swarm in August was distributed adjacent to the area occupied by the first swarm in June, implying that the rock fracture propagated from one zone to another during these two active swarm sequences.