巻号一覧
49 巻 (1996 - 1997)
- 4 号 p. 423-
- 3 号 p. 285-
- 2 号 p. 141-
- 1 号 p. 1-
前身誌
49 巻, 4 号
選択された号の論文の10件中1～10を表示しています
- |<
- <
- 1
- >
- >|
-
加藤 祐三1997 年 49 巻 4 号 p. 423-428
発行日: 1997/03/14
公開日: 2010/03/11
ジャーナル フリーTwo newly discovered archives have been found on the 1909 earthquake in southern Okinawa Island. One from the Okinawa Prefecture to the central government, and the other from independent newspaper articles in the “Ryukyu Shimpo” and the “Okinawa Mainichi Shinbun”. These archives are reliable because of the contemporaneous nature of both sources. The archives reveal that the earthquake disaster was larger than previously recorded (i. e., two fatalities, thirteen wounded, seven completely destroyed and nine partially broken houses). In total 1021 stone walls were broken, including 444 at Naha and Shuri. OMORI (1909) reported that in total fourteen kilometers of stone walls were broken at Naha and Shuri. This corresponds to on average 32m of broken wall at each location in Naha and Shuri. This average is much higher than that reported in the two newspapers (i. e., 3 to 5m per location). One and four-tenth of a kilometer may have been mistaken for fourteen kilometers by OMORI (1909).
While the damage to stone walls in Naha and Shuri was nearly the same, compared with the 1882 earthquake, the number of fatalities and injuries in Naha and Shuni were much different. Nobody died or was wounded in the 1882 earthquake, which happened at midnight, whereas in 1909, one died and eleven were wounded, and this earthquake occured a half an hour after sunset, in summer. This difference may have been caused by people being present near the stone walls.抄録全体を表示PDF形式でダウンロード (751K) -
三重県多度町における地震探査戸田 茂, 川崎 慎治, 三田村 宗樹, 中川 康一, 香川 敏幸, 横田 裕, 小林 芳正, 岡田 篤正1997 年 49 巻 4 号 p. 429-440
発行日: 1997/03/14
公開日: 2010/03/11
ジャーナル フリーOn the basis of a profile obtained through a multi-channel seismic-reflection survey in southern part of the Yoro Mountains, subsurface structure and activities of the Yoro and Ichinohara Faults are discussed together with the geological and geographical data published previously.
The Nobi Plain and Yoro Mountains (500-900 meters in average elevation) are separated by the Yoro Fault.
It is known from deep drillings that the sediments under the Nobi Plain consist of five principal units; pre-Tokai Group, Kono Formation, Kuragari Formation, Oizumi Formation, and middle Pleistocene to Holocene sediments. The seismic profile revealed two faults; the Yoro Fault in the central part of the profile and the Ichinohara Fault in the western part of the profile. The eastern part of the depth section is divided into six principal units. The structure along the Yoro Fault is disclosed for the first time by the present survey to be a very large flexure caused by reverse faulting. The total vertical displacement is about 500m at the bottom of the Tokai Group. The Yoro Fault starts moving in the depositional period of the Kuragari Formation, and its average displacement rate is of B class on the order of 0.1m per 1000 years. The Ichinohara Fault is a left-lateral fault and its vertical displacement is about 480m at the level of the upper Kono Formation in the survey line, and the average displacement rate is estimated as 0.48m per 1000 years (B class).抄録全体を表示PDF形式でダウンロード (2504K) -
平田 隆幸, 井元 政二郎1997 年 49 巻 4 号 p. 441-449
発行日: 1997/03/14
公開日: 2010/03/11
ジャーナル フリーA probabilistic cellular automaton was used to reproduce spatiotemporal seismicity patterns. Based on the conditional probability distribution obtained by analyzing the coarse-grained seismic activity pattern of the observational data set of Kanto area, the rule of the probabilistic cellular automata was determined. The simulation was carried out by a Monte Carlo method. The mutual information of the model was calculated for our probabilistic cellular automata model for the spatiotemporal seismic activity to estimate the degree of information transfer from the past state to the future state: the mutual information is 0.173bit in our model. A correlation function was calculated for both the simulation patterns and the observational seismicity patterns. As a result, although the interaction considering the nearest neighbor regions and only one time step is not sufficient enough to reproduce the observational seismicity pattern in our naive approach, we succeeded by a heuristic manner in finding out the rule of probabilistic cellular automata only considering the nearest neighbor interaction and one time step that well reproduces the observational seismicity pattern.抄録全体を表示PDF形式でダウンロード (2569K) -
大槻 憲四郎, 皆川 潤, 青野 正夫, 大竹 政和1997 年 49 巻 4 号 p. 451-460
発行日: 1997/03/14
公開日: 2010/03/11
ジャーナル フリーThe January 17, 1995 Hyogoken-Nambu earthquake (Japan Meteorological Agency magnitude of 7.2) produced surface rupture with a maximum right-lateral displacement of 2.1m and a maximum SE-up displacement of 1.4m on the Nojima fault, which runs along the northwest shore of Awaji Island. All the fault striations observed at 10 localities are horizontal, or more or less inclined northeastward. It is noteworthy that the fault striations on the up-thrown plane at 2 localities (Hirabayashi and Ogura) are convex downward, suggesting that the instantaneous slip vector changed from high to low angle through the rupture process. This curious phenomenon is reasonably explained by the temporal splitting of anti-plane mode of shear dislocation from in-plane mode which is realized for the dynamic growth of a mixed-mode shear crack at a trans-Rayleigh rupture speed and hence at a low shear stress [ANDREWS (1994)].抄録全体を表示PDF形式でダウンロード (4035K) -
羽鳥 徳太郎1997 年 49 巻 4 号 p. 461-466
発行日: 1997/03/14
公開日: 2010/03/11
ジャーナル フリーA small tsunami accompanied with the Hyogoken-Nanbu earthquake on January 17, 1995 (epicenter: 34°36′N, 135°03′E, d=14km, M=7.2, JMA), was observed at many tidal stations around the source area. The maximum double amplitude at Ei, Awaji Island, reached 68cm, and those at most Stations were 10-20cm or less with the wave period of 10-20min. By judging from the diagram of the attenuation of wave-height with distance, tsunami magnitude on the Imamura-Iida scale was determined to be m=-2, which is smaller by two grades (amplitude: 1/5 less) than those generated by earthquakes of the same magnitudes, because the seismic faults lay on land. The size of the source area estimated by means of an inverse refraction diagram is 70×13km2 extending NE-SW direction from the Hanshin region to the western area of Awaji Island. The tsunami source comprehends the aftershock area. Considering the distribution of the initial motions of tsunami observed by tidegauges, it suggests that the sea-bottom on the east side of the northern tsunami source (the northern part of Osaka Bay) was uplifted and that on the west side (Harima-Nada Sea) was subsided.抄録全体を表示PDF形式でダウンロード (711K) -
木下 繁夫, 上原 正義, 斗沢 敏雄, 和田 安司, 小久江 洋輔1997 年 49 巻 4 号 p. 467-481
発行日: 1997/03/14
公開日: 2010/03/11
ジャーナル フリーThe National Research Institute for Earth Science and Disaster Prevention (NIED) established a new strong-motion observation network, K-NET. The K-NET is a system which sends strong-motion data on the Internet, data which are obtained from 1, 000 observatories deployed all over Japan.
The K-NET used a new strong-motion seismograph, K-NET95. The K-NET95 has a, causal recording system with a dynamic range of about 108dB. From the records of instrumental noise at a quiet hard rock site, we obtained the resolution of the K-NET95. On the seismic records of the K-NET95, we discussed the relation between the resolution and the low-cut filters for integration.
From the factory tests, we obtained the effects of temperature on DC offset, sensitivity and overall frequency response characteristics, respectively. Also, cross-talk was measured by using shaking table test.抄録全体を表示PDF形式でダウンロード (2091K) -
井元 政二郎1997 年 49 巻 4 号 p. 483-485
発行日: 1997/03/14
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (250K) -
横山 正義1997 年 49 巻 4 号 p. 487-489
発行日: 1997/03/14
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (430K) -
佐藤 裕1997 年 49 巻 4 号 p. 491-502
発行日: 1997/03/14
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (1194K) -
1997 年 49 巻 4 号 p. 503-504
発行日: 1997年
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (157K)
- |<
- <
- 1
- >
- >|