Earthquake-induced rapid long-traveling flow phenomenon: May 2003 Tsukidate landslide in Japan   总被引：3，自引：2，他引：1  

Hiroshi?Fukuoka  Gonghui?WangEmail author  Kyoji?Sassa  Fawu?Wang  Tatsunori?Matsumoto 《Landslides》2004,1(2):151-155

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Overview of the MITI Nankai Trough Wells: A Milestone in the Evaluation of Methane Hydrate Resources   总被引：4，自引：0，他引：4  

Yoshihiro Tsuji    Hisashi Ishida    Masaru Nakamizu    Ryo Matsumoto  Satoshi Shimizu 《Resource Geology》2004,54(1):3-10

Abstract. Bottom-simulating reflectors suggestive of the presence of methane hydrates are widely distributed below the ocean floor around Japan. In late 1999, drilling of the MITI Nankai Trough wells was conducted to explore this potential methane hydrate resource and a Tertiary conventional structure. The wells are located in the Northwest Pacific Ocean off Central Japan at a water depth of 945 m. A total of six wells were drilled, including the main well, two pilot wells, and three post survey wells at intervals of 10–100 m. All wells except the first confirmed the occurrence of hydrates based on logging-while-drilling, wire-line logging and/or coring using a pressure and temperature coring system in addition to conventional methods. Based on the various well profiles, four methane hydrate-bearing sand-rich intervals in turbidite fan deposits were recognized. Methane hydrates fill the pore spaces in these deposits, reaching saturation of up to 80 % in some layers. The methane hydrate-bearing turbiditic sand layers are less than 1 m thick, with a total thickness of 12–14 m. The bottom depth of high hydrate concentration correlates well with the depth of the bottom-simulating reflector. Based on these exploration results, the Japanese government inaugurated a 16-year methane hydrate exploitation program in 2001.  相似文献   

Surface Heat Balance and Spatially Distributed Ablation Modelling at Koryto Glacier, Kamchatka Peninsula, Russia   总被引：1，自引：0，他引：1  

Keiko Konya  Takane Matsumoto  Renji Naruse 《Geografiska Annaler: Series A, Physical Geography》2004,86(4):337-348

To investigate the characteristics of ablation at Koryto Glacier, a mountain glacier under maritime climate in Kamchatka Peninsula, Russia, we made field observations from August to early September 2000. At a site near the equilibrium line, the 31‐day average net radiation, sensible heat flux, and latent heat flux were 43, 59 and 31 W^?2, respectively. We developed a new distributed ablation model, which only needs measurements of air temperature and global radiation at one site. Hourly ablation rates at this site obtained by the energy balance method are related to measured air temperature and global radiation by linear multiple regression. A different set of multiple regression coefficients is fitted for snow and ice surfaces. Better estimates of ablation rate can be obtained by this approach than by other temperature index models. These equations are then applied to each grid cell of a digital elevation model to estimate spatially distributed hourly melt. Air temperature is extrapolated using a constant temperature lapse rate and global radiation is distributed considering topographic effects. The model enables us to calculate the hourly spatial distribution of ablation rates within the glacier area and could well provide a realistic simulation of ablation over the whole glacier.  相似文献   

Two recent flowslides in Yamashina area, Kanazawa City, Japan     

Fa-Wu Wang  Tatsunori Matsumoto  Yasuhiro Tanaka 《Landslides》2005,2(3):229-234

Due to a continual rainfall, a flowslide occurred in Yamashina area, Kanazawa City, Japan on November 8, 2002 in the Tertiary mudstone area. The sliding mass was fully fluidized during the motion and moved downward the slope for a long distance. On December 31, 2003, slope failure was triggered by intensive rainfall and snowmelt water at the same site again, and resulted in the second occurrence of flowslide. The total displacement of the slope was recorded with an extensometer. Through field investigation, the difference of the sliding mechanism between the two flowslides was examined.  相似文献   

家用电器重复出现的地震前兆异常     

池谷元伺 《华南地震》1998,18(2):53-57

据有关报导,１９９５年神户地震前家用电器出现了奇怪的异常现象。我们在实验室中利用范德格拉夫静电发电机用磨擦生电的方法,证实了这些收音机和电视的噪音以及频道混乱现象的存在。  相似文献   

Seasonal　Transition　of　Summer　Rainy　Season　over　Indochina　and　Adjacent　Monsoon　Region   总被引：10，自引：0，他引：10  

Jun MatsumotoDepartment of Geography  University of Tokyo --  Hongo  Bunkyo-ku  Tokyo  Japan 《大气科学进展》1997,(2)

ＳｅａｓｏｎａｌＴｒａｎｓｉｔｉｏｎｏｆＳｕｍｍｅｒＲａｉｎｙＳｅａｓｏｎｏｖｅｒＩｎｄｏｃｈｉｎａａｎｄＡｄｊａｃｅｎｔＭｏｎｓｏｏｎＲｅｇｉｏｎＪｕｎＭａｔｓｕｍｏｔｏＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｇｒａｐｈｙ，ＵｎｉｖｅｒｓｉｔｙｏｆＴｏｋｙｏ...  相似文献   

中国渤海地区海底地震观测的初步研究          下载免费PDF全文

冯德益  市川政治  松本英照  陈金林  吴国有 《地震工程学报》1988,10(3):98-123

本文是在日本造船振兴财团的经费赞助下在中国渤海地区发展海底地震观测的初步技术报告。本报告主要包括以下内容: (1) 渤海及其邻近地区的地震活动性与地震危险性估计; (2) 渤海地区海底地震观测的条件; (3) 渤海地区海底地震观测仪器与技术的某些初步研究结果; (4) 浅海情况下海底地震观测噪声的模拟实验研究结果。文中研究了该地区的历史与现代地震活动性、长期地震危险性以及发生在华北与日本的大地震之间的关系。还讨论了渤海强震和海啸对渤海及其邻近海域航海的影响问题。在这些研究结果的基础上对在渤海地区开展海底地震观测的必要性进行了解释。本文探讨了在渤海地区进行海底地震观测的某些仪器和技术问题。天津市地震局曾在渤海地区石油平台的油井中作过初步地震观测试验。日本气象厅气象研究所发展的海底地震观测中有关降低噪声与信号传输等方面的新技术与经验可用于渤海地区的海底地震观测。在这些研究的基础上,提出了一个在中国渤海地区发展渤海地震观测的初步设想。指出渤海海底地震观测试验应从观测和研究渤海海底海洋噪声谱开始。为了研究浅海情况下海底地震观测的噪声,本文完成了一项新的模拟试验工作。分别对海面源及海内源产生的噪声进行了实验研究。文中给出了一些重要实验结果。本文所得的初步结果,对发展渤海及邻近地区海底地震观测有一定的参考价值。  相似文献   

Sequencing Batch Experiments with activated Sludge Consuming Glucose and Phenol     

V. A. Vavilin  A. Endo  J. Matsumoto 《洁净——土壤、空气、水》1987,15(6):665-668

During the rather short solids retention time θ = 1.25 d phenol is not utilized by activated sludge and only glucose is consumed during the sequencing batch experiments. After glucose consumption the residual COD concentration (COD = 820 mg/l) is represented mainly by the phenol concentration. During the rather long solids retention time θ = 8 d phenol is consumed by activated sludge as well as glucose. In this case the residual COD concentration is much smaller (COD = 46 mg/l) and the ratio BOD₅/COD = 0.1 is small, too. The general model of biological treatment suggested by one the authors earlier can describe the sequencing batch experimental data rather well.  相似文献   

Computational model of the structural and elastic properties of the ilmenite and perovskite phases of MgSiO3     

Masanori Matsui  Masaki Akaogi  Takeo Matsumoto 《Physics and Chemistry of Minerals》1987,14(2):101-106

The structural and elastic properties of the ilmenite and perovskite phases of MgSiO₃ are investigated with a computational model based on energy minimization. The potential energies of these two crystals are approximated by the sum of Coulomb, van der Waals, and repulsion terms between atoms. Required energy parameters are derived by fitting the parameters to the observed crystal structures of these two phases as well as to the measured elastic constants of the ilmenite phase. The resulting potential model is applied to predicting the elastic constants of the perovskite phase. The calculated bulk modulus of the perovskite phase compares favorably with the data obtained from volume-compression experiments as well as the values estimated from empirical elasticity systematics of perovskite type compounds. The predicted shear modulus of the perovskite phase is also in reasonable agreement with the values proposed from similar empirical elasticity systematics. Subsequently, the model is used to simulate the high pressure behaviors of the crystal structures and elastic constants of these two phases.  相似文献   

Wind fluctuations near a cold vortex-tropopause funnel system observed by the MU radar     

Shoichiro Fukao  Manabu D. Yamanaka  Hiromasa Matsumoto  Toru Sato  Toshitaka Tsuda  Susumu Kato 《Pure and Applied Geophysics》1989,130(2-3):463-479

Vertical and temporal variations of three-dimensional wind velocity associated with an upper-tropospheric cold vortex-tropopause funnel system were observed by an MST radar in Japan (the MU radar). Marked changes of vertical velocity and horizontal wind direction were found between the inside and outside of the cold vortex. The vertical velocity activity outside the vortex was asymmetric; it was most active in a sector before the vortex. Unsaturated internal gravity waves in their generation stage contribute predominantly to the vertical velocity activity, suggesting that tropospheric occluded cyclones may be a possible source of middle-atmospheric gravity waves through the geostrophic adjustment process.  相似文献