1 0 0 0 OA 地震動予測のための深層地盤P・S波速度の推定
- 著者
- 狐崎 長琅 後藤 典俊 小林 芳正 井川 猛 堀家 正則 斉藤 徳美 黒田 徹 山根 一修 奥住 宏一
- 出版者
- 日本自然災害学会
- 雑誌
- 自然災害科学 (ISSN:02866021)
- 巻号頁・発行日
- vol.9, no.3, pp.1-17, 1990-12-31
- 被引用文献数
- 45 75
The following two kinds of empirical relations are derived : 1) relations between the P-wave velocities and geological factors (facies, time, and depth), based on oil well data in Akita prefecture; 2) relations between the S-wave velocities and the P-wave ones, based on published and new data from in situ velocities measurements in relatively deep boreholes in Japan. Combination of the above two relations provides means for estimating the S-wave velocities from geological factors. A VSP experiment was carried out in a well of 1.3 km depth in Akita prefecture to provide this study with S- and P-wave data of oil field area. To demonstrate the purpose of this study, calculations of ground vibrations due to the vertically incident SH-waves are conducted for a two-dimentional seismic structure model corresponding to a typical sedimentary basin in Akita prefecture.
1 0 0 0 OA 平成21年(2009年)4月6日イタリア中部(ラクイラ)地震被害調査速報
- 著者
- 上西 幸司
- 出版者
- 日本自然災害学会
- 雑誌
- 自然災害科学 (ISSN:02866021)
- 巻号頁・発行日
- vol.28, no.2, pp.167-183, 2009-08-31
An earthquake of moment magnitude 6.3 has struck the L'Aquila region in Italy on April 6, 2009, at 3:32am (local time), and claimed nearly 300 lives. Another 1,500 were injured and 66,000 became homeless. The Research Center for Urban Safety and Security of Kobe University has sent the author to investigate the earthquake-induced damage in the stricken area from April 16 to 19, 2009. This article briefly reports the damage of buildings and the ground by showing the photographs taken in the L'Aquila region together with the pre-earthquake images provided by the Google Street View. The response of the affected people, living in a developed country, to the disaster is also mentioned.
1 0 0 0 OA 2004年台風21号と前線による豪雨災害
- 著者
- 葛葉 泰久 沼本 晋也 カザディ サンガ ンゴイ 福山 薫
- 出版者
- 日本自然災害学会
- 雑誌
- 自然災害科学 (ISSN:02866021)
- 巻号頁・発行日
- vol.24, no.4, pp.409-421, 2006-02-28
- 被引用文献数
- 3
Mie Prefecture suffered from water-related disasters due to the Typhoon T200421 on September 29, 2004. Nine persons died, about 70 houses were destroyed by debris flows, slope failures or landslides, and more than 5,000 households were inundated. In this work, first, we analyze meteorological data and conclude that the heavy rainfall were caused by the existence of a stationary front into which the typhoon supplied warm humid air masses, and the orographic conditions over Mie. Secondly, we estimate the return period of t-hour (t=1, 2, 3, 6, 12, 24 hours) precipitation at four locations in the prefecture. Finally, disasters due to landslides or debris flows in Miyagawa Village are overviewed and discussed. The above-mentioned meteorological analysis shows a very close relationship between the locations of heavy precipitations during relatively long terms (say 24 hours) and the occurrence of debris flows or landslides.
