Study on Seismic Response of the Aratozawa Dam based on Temporary Seismic Observation Data
熊谷周治; 片岡俊一; 茂木秀則; 南雲秀樹; 岡村航
日本地震学会秋季大会講演予稿集(CD-ROM), Volume：2020, 2020
J-Global ID：202102244888004119
Velocity Structure of Rockfill Dam Body Inferred from Earthquake Records
茂木秀則; 曽田英揮; 荒井大輝; 佐藤信光
ダム工学, Volume：29, Number：3, 2019
ISSN：0917-3145, J-Global ID：201902242480889184
地震観測記録に基づくNIOM解析によるロックフィルダム堤体の速度構造の推定
佐野貴之; 佐藤信光; 曽田英揮; 茂木秀則
Volume：74th, 2019
J-Global ID：201902226241347461
Propagation Time of SeismicWaves in Rockfill Dam Body Estimated from Acceleration Records
茂木秀則; 川上英二
日本地震工学会論文集(Web), Volume：18, Number：4, 2018
ISSN：1884-6246, J-Global ID：201802215540444955
NIOM法による地盤の非線形化に伴う減衰比の変化の検討
茂木秀則; 名倉匡人; 川上英二
Volume：15th, 2018
J-Global ID：201902215426959257
地震観測記録に基づくロックフィルダム堤体の動的物性に関する研究
田那部直也; 曽田英揮; 茂木秀則; 川上英二; 佐藤信光
Volume：72nd, 2017
J-Global ID：201702252838650460
Dynamic Soil Properties of Rockfill Dam Body Estimated from Long-term Earthquake Observation Records
茂木秀則; 曽田英揮; 田那部直也; 佐藤信光
ダム工学, Number：108, 2017
ISSN：0917-3145, J-Global ID：201802280768124737
Propagation Time of Seismic Waves at KiK-net Hino Observation Site during, before and after the 2000 Tottori-ken Seibu Earthquake
茂木秀則; 川上英二; 内海満希
日本地震工学会論文集(Web), Volume：16, Number：1, 2016
ISSN：1884-6246, J-Global ID：201602218151632001
NIOM Analysis of Long-Term Earthquake Observation Records at Earth Dam and Estimation of Soil Properties of Dam Body
茂木秀則; 曽田英揮; 川上英二; 大町達夫
ダム工学, Number：99, 2015
ISSN：0917-3145, J-Global ID：201502203054875868
芝浦工業大学豊洲校舎の基礎スラブ上と支持基盤内の地震記録に対するNIOM解析
紺野克昭; 三浦太郎; 茂木秀則; 西川貴文; 藤野陽三
Volume：70th, 2015
J-Global ID：201502216349893633
Temporal Change of Propagation Time of Seismic Waves Estimated from Long-Term Earthquake Observation Records at Rockfill Dam
茂木秀則; 川上英二; 小田優介; 大町達夫
ダム工学, Number：100, 2015
ISSN：0917-3145, J-Global ID：201602220502682803
KiK-net日野における2000年鳥取県西部地震とその前後の地震波の伝播時間
茂木秀則; 川上英二; 内海満希
Volume：14th, 2014
J-Global ID：201502252075250442
KiK-net-関西観測記録のNIOM解析
茂木秀則; SHRESTHA Santa Man; 川上英二; 川村潤也
Number：127, 2013
J-Global ID：201302293823152126
IWTH25観測点における2008年岩手・宮城内陸地震とその前後のS波の伝播時間
茂木秀則; 川上英二
Volume：10th, 2013
J-Global ID：201402273705366487
常時微動計測による岩塊の振動特性の検討
茂木秀則; MULMI Sagar Prasad; 長田昌彦
Volume：9th, 2012
J-Global ID：201302276106237484
常時微動観測に基づく岩塊の振動特性と回転半径の推定方法
別役昌孝; 長田昌彦; 茂木秀則; 荒井進吾
Volume：13th, 2012
ISSN：1883-1486, J-Global ID：201302275836878403
Temporal Change in Propagation Time of Seismic Waves Observed at Vertical Array in the Onagawa Nuclear Power Plant during, before, and after the 2011 Off the Pacific Coast of Tohoku Earthquake
茂木秀則; 川上英二
日本地震工学会論文集(Web), Volume：12, Number：5, 2012
ISSN：1884-6246, J-Global ID：201302293639600787
東北地方太平洋沖地震における女川原子力発電所鉛直アレー観測記録のNIOM解析
茂木秀則; 川上英二
Volume：8th, 2011
J-Global ID：201202262444379830
常時微動観測による岩塊の振動特性の検討
茂木秀則; 高橋学; 長田昌彦; 荒井進吾
Volume：12th(CD-ROM), 2008
ISSN：1883-1486, J-Global ID：200902206310202648
柏崎刈羽原子力発電所内の鉛直アレー観測記録のNIOM解析
茂木秀則; SHRESTHA Santa man; 川上英二; 岡村真也
Volume：6th, 2008
J-Global ID：200902233114063602
基盤断層の変位が第四紀地盤上の構造物に与える影響の評価
岩下和義; 谷山尚; 長田昌彦; 川上英二; 茂木秀則; 斎藤正人
Number：7, 2007
ISSN：1347-4758, J-Global ID：200902235496483889
WAVEFORMS OF SCATTERED WAVES GENERATED AT AN IRREGULAR GROUND SURFACE
茂木秀則; 川上英二
土木学会論文集 A, Volume：63, Number：3, 2007
J-Global ID：200902242623004312
長瀞における岩塊上の常時微動観測
茂木秀則; 長田昌彦; 橋田智大
Volume：62nd, Number：Disk 1, 2007
J-Global ID：200902269812236726
ANALYSIS OF SEISMIC WAVE PROPAGATION IN A GROUND WITH SINUSOIDAL-SHAPED SURFACE IRREGULARITY
川上英二; 茂木秀則; 福原幸司
日本建築学会構造系論文集, Number：587, 2005
ISSN：1340-4202, J-Global ID：200902217835871968
BOUNDARY ELEMENT-PERTURBATION METHOD USING NEUMANN SERIES EXPANSION FOR SEISMIC RESPONSE ANALYSIS OF THE GROUND WITH IRREGULAR SURFACE
茂木秀則; 川上英二; 福原幸司
土木学会論文集, Number：787, 2005
ISSN：0289-7806, J-Global ID：200902218228329816
地表面での地震動のばらつきと地形・樹木・建物群などの影響の解明
川上英二; 渡辺啓行; 荒川洋二; 岩下和義; 茂木秀則; 谷山尚; 斎藤正人
Volume：4, 2005
ISSN：1347-1945, J-Global ID：200902244211646860
地表面の起伏によって生じる散乱波について
茂木秀則; 川上英二
Volume：59th, Number：Disk 1, 2004
J-Global ID：200902258987572271
高密度アレー観測記録に見られる計測震度のばらつきについて
茂木秀則; 川上英二
Volume：58th, Number：Disk 1, 2003
J-Global ID：200902265379576333
STATISTICAL ANALYSES OF VELOCITY RESPONSE SPECTRAL RATIOS ESTIMATED FROM DENSE ARRAY DATABASE.
川上英二; 茂木秀則; YANG Z
日本地震工学シンポジウム論文集, Volume：11th, 2002
J-Global ID：200902197829907380
重み付き相乗平均を用いた地震波の内挿方法
山地幸子; 川上英二; 茂木秀則
Volume：57th, 2002
J-Global ID：200902159250625929
Determination of spatial distribution of response spectral ratios from dense array data.
川上英二; 茂木秀則
日本建築学会構造系論文集, Number：551, 2002
ISSN：1340-4202, J-Global ID：200902172722040810
Probability Distribution of JMA Seismic Intensity Differences between Arbitrary Site Paris on Laterally Homogeneous Ground Estimated from Seismometer Array Database.
茂木秀則; 川上英二
地震, Volume：55, Number：2, 2002
ISSN：0037-1114, J-Global ID：200902175918697230
摂動解法を用いた境界要素法による不整形地盤の応答解析
福原幸司; 茂木秀則; 川上英二
Volume：57th, 2002
J-Global ID：200902183329621374
Spatial Distribution of Peak Ground Accelerations Estimated from ‘Signal’ Database.
茂木秀則; 川上英二
土木学会論文集, Number：647, 2000
ISSN：0289-7806, J-Global ID：200902158400702750
二地点間の最大加速度比の統計解析
茂木秀則; 川上英二
Volume：55th, Number：B, 2000
J-Global ID：200902191160201560
高密度アレーにおける最大加速度比の統計解析
茂木秀則; 川上英二
Volume：25th, 1999
J-Global ID：200902138550860663
最大加速度比を用いた最大加速度のばらつきの検討
茂木秀則; 川上英二
Volume：54th, Number：B, 1999
J-Global ID：200902186996411484
Probability Distribution of Peak Ground Acceleration Ratios Estimated from Strong Ground Motion Array Database.
川上英二; 茂木秀則
土木学会論文集, Number：626, 1999
ISSN：0289-7806, J-Global ID：200902199025037742
Earthquake Wave Propagation Analysis by Simplified Input Output Relation Method(SIORM).
川上英二; 茂木秀則; 高橋亜希子; DE JESUS BIDON P
日本地震工学シンポジウム論文集, Volume：10th, 1998
J-Global ID：200902103906417265
Study on the Characteristics of Ground Motion by Means of Incident Boundary Amplification Factor.
茂木秀則; 川上英二
日本地震工学シンポジウム論文集, Volume：10th, 1998
J-Global ID：200902105633031116
Incident Boundary and Averaged Amplification Factors of SH Wave for Ground with Irregular Subsurface Topography.
茂木秀則; 川上英二
土木学会論文集, Number：605, 1998
ISSN：0289-7806, J-Global ID：200902192821209038
Interpolation of Seismic Waves Using Weighted Harmonic Mean in Frequency Domain.
川上英二; 茂木秀則; 佐藤誠一
日本地震工学シンポジウム論文集, Volume：10th, 1998
J-Global ID：200902197575846505
Estimation of earthquake wave propagation characteristic by SIORM using AR model.
川上英二; BIDON P J; 茂木秀則
土木学会地震工学研究発表会講演論文集, Volume：24th, 1997
J-Global ID：200902103530027436
SH incident wave and amplification factor in uneven ground.
茂木秀則; 川上英二
土木学会地震工学研究発表会講演論文集, Volume：24th, 1997
J-Global ID：200902156444496942
Spatial distribution of maximum acceleration based on SMART1 array observation records.
西一彦; 川上英二; 茂木秀則
土木学会年次学術講演会講演概要集 第1部, Volume：51st, Number：B, 1996
J-Global ID：200902102938302692
Interpolation method of seismic waveform between observation points distributed on the plane.
佐藤誠一; 川上英二; 茂木秀則
土木学会年次学術講演会講演概要集 第1部, Volume：51st, Number：B, 1996
J-Global ID：200902111133154629
Interpolation method of seismic waveform using geometric mean in frequency domain.
佐藤誠一; 川上英二; 茂木秀則; 内山浩史
土木学会年次学術講演会講演概要集 第1部, Volume：50th, Number：B, 1995
J-Global ID：200902118363807022
Research on spatial distribution of maximum acceleration using strong motion array observation record.
西一彦; 川上英二; 茂木秀則
土木学会年次学術講演会講演概要集 第1部, Volume：50th, Number：B, 1995
J-Global ID：200902118547789795
Interpolation and Simulation of Space-time Variation Including Observed Earthquake Time History Records.
川上英二; 茂木秀則
構造物の安全性および信頼性, Volume：3, 1995
J-Global ID：200902141645532893
Expected value and dispersion of power spectrum ratio of micro-tremor.
茂木秀則; 川上英二
土木学会年次学術講演会講演概要集 第1部, Volume：50th, Number：B, 1995
J-Global ID：200902164250866695
Simulation of Seismic Motion of Illegularly Layered Media Excited by Faulting.
片岡正次郎; 大町達夫; 茂木秀則
応用力学連合講演会講演予稿集, Volume：45th, 1995
J-Global ID：200902128388296532
On Rayleigh Waves in an Elastic Medium Lying over a Rigid Basement.
茂木秀則; 大町達夫
地震, Volume：47, Number：1, 1994
ISSN：0037-1114, J-Global ID：200902138322258139
Near-field Ground Strain Evaluated by the 3-D Discrete Wave-number Method.
大町達夫; 茂木秀則; 中村洋一
日本地震工学シンポジウム論文集, Volume：9th, Number：Pt 1, 1994
J-Global ID：200902152585841389
三次元離散化波数法による電源近傍における地震動の解析
中村洋一; 大町達夫; 年縄巧; 茂木秀則
Volume：48th, 1993
J-Global ID：200902118160632154
1993年能登半島沖地震の珠洲市における地震動特性
茂木秀則; 年縄巧; 東畑郁生; 紺野克昭
Volume：48th, 1993
J-Global ID：200902151297742876
Rayleigh Function and Response to Compressional Source in an Elastic Medium Lying over a Rigid Basement.
茂木秀則; 大町達夫
東京工業大学土木工学科研究報告, Number：48, 1993
ISSN：1345-3572, J-Global ID：200902198675140789
離散化波数法によるやや長周期地震動の推定
茂木秀則; 大町達夫; 年縄巧
Volume：47th, 1992
J-Global ID：200902022944737451
An Approach to Reformulation of Rayleigh Waves by Means of a Vibration Theory(II). In Case of Elastic Double-Layers.
大町達夫; 茂木秀則
東京工業大学土木工学科研究報告, Number：43, 1991
ISSN：1345-3572, J-Global ID：200902027354825004
Vibration characteristics of waterfront reclaimed ground estimated from micro-tremor.
大町達夫; 年縄巧; 茂木秀則
土木学会年次学術講演会講演概要集 第1部, Volume：45th, 1990
J-Global ID：200902036051219232
Investigation of seismic-wave velocities in embankment dam body
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), 01 Apr. 2017 - 31 Mar. 2021
Mogi Hidenori, Saitama University
Grant amount(Total)：4810000, Direct funding：3700000, Indirect funding：1110000
We applied the NIOM method (Normalized Input--Output Minimization) to long-term earthquake observation records from such as Shitoki Dam and Aratozawa Dam to determine the propagation velocities of seismic waves in the embankment, and investigated changes in soil properties. As a result, we showed that (1) the velocities of S- and P-waves decreased significantly during strong ground motions due to the 2008 Iwate-Miyagi Nairiku earthquake and the the Great East Japan earthquake of 2011; (2) in subsequent minor earthquakes the propagation velocity increased more or less in proportion with the logarithm of the number of elapsed days; (3) the damping ratio in the dam body also increased due to the principal motions of the mainshocks and decreased after them in the similar manner as seen in the results of the propagation time; and, (4) an FE/BE analysis using the estimated propagation velocities was conducted and wave-propagation characteristics in the embankment was discussed.
Grant number：17K06528
Evaluation of S-wave velocities in earth dam body on the basis of earthquake records and examination of aging process
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), 01 Apr. 2013 - 31 Mar. 2016
MOGI Hidenori; KAWAKAMI Hideji; KATAOKA Shunichi; OHMACHI Tatsuo, Saitama University
Grant amount(Total)：5200000, Direct funding：4000000, Indirect funding：1200000
In this study, we conducted Normalized Input-Output Minimization (NIOM) analysis of earthquake records at the crest, core, and gallery/foundation of many filldams in Japan such as Nagara dam, Tougane dam (the Japan Water Agency), Aratozawa dam, Koda dam (Miyagi prefecture) and Moriyoshizan dam (Ministry of Land, Infrastructure, Transport and Tourism) and examined the propagation velocities of seismic waves in the dam body. We also examined the nonlinear behavior and temporal changes of shear rigidity of the dam body. These examinations revealed that (1) the soil degradation in the dam bodies due to the extremely strong ground motion caused by the 2008 Iwate-Miyagi Nairiku earthquake and The 2011 off the Pacific coast of Tohoku Earthquake observed at Aratozawa and Koda dams, (2) healing process from the soil degradation was also observed.
Grant number：25420477
Microtremor Measurement of Rock Mass and Its Application to Rock-fall Hazard Assessment
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), 2010 - 2012
MOGI Hidenori; OSADA Masahiko, Saitama University
Grant amount(Total)：4290000, Direct funding：3300000, Indirect funding：990000
Rock-fall hazard assessment is indispensable procedure in maintenance of roads and rail tracks. So, a simple and quantitative evaluation of the hazard is needed. From this point of view, several methods based on vibration measurements have been presented. In this study, we proposed a new method to estimate toppling acceleration of a rock mass based on the horizontal-to-vertical natural frequency ratio of microtremors. We applied the method to rock masses and showed that the estimated toppling accelerations were consistent with results obtained from the method proposed by other authors.
Grant number：22560474
Effects of irregular topography on nonlinear earthquake groundmotions and earthquake damage
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), 2006 - 2008
MOGI Hidenori; KAWAKAMI Hideji, Saitama University
Grant amount(Total)：3760000, Direct funding：3400000, Indirect funding：360000
Grant number：18560463
Study on Time-Space Variations of Earthquake Waves Considering Non-Uniformity of Ground Surface Conditions
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), 2005 - 2007
KAWAKAMI Hideji; IWASHITA Kazuyosi; MOGI Hidenori; TANIYAMA Hisashi; SAITO Masato, Saitama University
Grant amount(Total)：13520000, Direct funding：12800000, Indirect funding：720000
The purpose of this study is to clarify the effects of the conditions of the ground surface on the earthquake ground motions. Irregular shaped ground, lots of trees and buildings, Which are existing ordinally at the ground surface, were considered in this study. Even if it has been pointed out previously that the ground with an irregular surface may cause complicated seismic responses, the process of generating this complex response has not yet been clarified. In this study, such a process was also examined.
Regarding the effects of the irregular ground surface, for example, it has been pointed out that the ground with an irregular surface causes complicated seismic responses. However, the process of generating this complex response is not yet clarified. In this study, boundary element-perturbation method has been developed to investigate scattering of seismic waves due to an irregular surface. This method is based on the boundary element method in frequency domain and perturbation technique employing the Neumann series. By using this method, the ground response can be separated into those induced by incident waves and scattered waves. Numerical results showed that the amplitudes of the scattered waves are affected by both distance and direction of the irregular surface to the observation points.
Grant number：17360209
The effects of surface geometry tree and buildings on distribution of wave propagation
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 2002 - 2004
IWASHTTA Kazuyoshi; KAWAKAMI Hideji; MOGI Hidenori; TANIYAMA Hisashi; SAITOH Masato, Saitama University
Grant amount(Total)：10500000, Direct funding：10500000
It is well known that the most fundamental and important problem in the seismic engineering is estimation of the surface ground motion caused by earthquake. Usually, to evaluate the surface ground motion and wave propagation in the surface layer, the ground is modeled as the very simple flay layer system, while the real surface ground is quite irregularly shaped. And the programs, like as SHAKE, based on the wave propagation in simple layer system are applied. In those cases, the ground is assumed as flat and there is nothing on the surface. There are many local and micro geographical features on the ground surface. On the ground, there may be many trees, forests, houses and buildings. There is a possibility that wave propagation is affected these features, In this study, the effects of these omitted phenomena on the wave propagations are evaluated.
Seismic responses of a ground with various types of sinusoidal shaped irregularity were evaluated by using the boundary element method and analyzed based on "scattered-wave contribution". The examination of the numerical results revealed the following : 1)the response at the trough varies sharply with frequency whereas the response at the peak shows large amplification over a wide frequency range ; 2)the predominant frequencies at the trough depend on the amplitude of the surface irregularity and do not depend on the number of fluctuations of the ground ; and 3)these characteristics can be understood as the results of the interference of scattered waves coming from the irregular surface.
Peak ground acceleration(PGA) as a measure of earthquake motion intensity is an important factor in the earthquake-resistant design and reliability analysis of structures. The purpose of this article is to examine the spatial variability of PGAS (recorded at the same epicentral distance) as a function of separation distance. To do this, we define PGA ratios as spatial intraevent variations of PGAS and examine their statistical characteristics. We analyze the probability distribution of the ratios and formulate equations for their probability density functions, mean values, standard deviations, and percentiles. These statistics are then estimated using accelerometer arrays of the Chiba, SMART-1, and SIGNAL databases. Then, the relationship between these statistics and the station separation distances is analyzed. We found that the means and standard deviations have an almost linear relationship with the logarithm of the station separation distances ranging from several meters to 100 km. Finally, based on the fiftieth and ninety-fifth percentiles, the differences between PGAS at two different sites due to future earthquakes are discussed.
Grant number：14350237
Study on effects of ground surface conditions like irregular shaped ground, trees and buildings on earthquake ground motions
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), 2002 - 2004
KAWAKAMI Hideji; MOGI Hidenori; TANIYAMA Hisashi; WATANABE Hiroyuki, Saitama University
Grant amount(Total)：9800000, Direct funding：9800000
The purpose of this study is to clarify the effects of the conditions of the ground surface on the earthquake ground motions. Irregular shaped ground, lots of trees and buildings, which are existing ordinally at the ground surface, were considered in this study. Even if it has been pointed out previously that the ground with an irregular surface may cause complicated seismic responses, the process of generating this complex response has not yet been clarified. In this study, such a process was also examined.
Regarding the effects of the irregular ground surface, for example, the seismic responses of ground models with sinusoidal-shaped irregularity, i.e., with various heights and numbers of sinusoidal-shapes, were analyzed. The boundary element method was developed in SH wavefield for numerical analyses, and it was utilized to estimate the frequency response functions at the ground surface. Also, scattered-wave contribution was newly introduced to examine the frequency response functions. The examination of the numerical results revealed the followings :
1)the frequency response at the trough varies sharply with frequency, whereas the response at the peak shows large amplification over a wide frequency range ;
2)the predominant frequencies at the trough depend on the amplitude of the surface irregularity and do not depend on the number of fluctuations of the ground ; and
3)these characteristics can be understood as the results of the interference of scattered waves coming from the irregular surface.
Grant number：14380199
地形の形状の不確定性を考慮した不整形地盤の増幅特性の確率論的検討
2002 - 2004
Grant amount(Total)：3300000, Direct funding：3300000
Grant number：14750396
地上構造物や樹木などの不規則分布を考慮した地震外力の推定手法の開発
2001 - 2002
Grant amount(Total)：2100000, Direct funding：2100000
Grant number：13878079
Development and systematization of analytical methods for seismometer array records and expansion of seismometer array on campus
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)., Grant-in-Aid for Scientific Research (B)., 1998 - 2000
KAWAKAMI Hideji; TANIYAMA Hisashi; MOGI Hidenori; WATANABE Hiroyuki; HADDADI Hamid Reza, SAITAMA UNIVERSITY
Grant amount(Total)：7000000, Direct funding：7000000
The objectives of this study are (1) development of analytical methods for the records of seismometer array and their engineering application ; (2) investigation of the spatial characteristics of ground motions ; and (3) provision of space-time ground motions for earthquake resistant design.
(1.a) Development of Analytical Methods for the Records of Seismometer Arrays
New methods both in time domain and frequency domain have been developed to investigate the phenomena of wave propagation. The methods have been examined from the viewpoints of precision and numerical stability. Then, the methods have been demonstrated by using observation records, and the nonliear wave propagation in soft soil has been discussed. These results were published in the proceedings of the 11th European Conference on Earthquake Engineering and Soil Dynamics and Earthquake Engineering.
(1.b) Spatial variation of Peak Ground Acceleration
Intra-event spatial variations have been investigated by using the records of seismometer arrays. The findings of this research were summarized in the proceedings of the JSCE.
(2) Investigation of Spatial Characteristics of Ground Motions
Seismometer array installed at Saitama University has been expanded. The records of this system and other published records have been analyzed to examine the spatial claracteristics of ground motions such as the speed of horizontal wave propagation and coherence value.
(3) Provision of Space-time Ground Motions for Earthquake Resistant Design
The methods to predict space-time ground motions have been examined and improved for a more accurate representation of the actual wave propagation. A new method has also been developed based on the interpolation of observed records. The numerical stability of this method has been closely investigated for the engineers who are not specialized in waveform analyses.
Grant number：10450171
地震観測記録と地盤構造データを用いた入射波動場の解析
1997 - 1998
Grant amount(Total)：2100000, Direct funding：2100000
Grant number：09750548
PROLOG言語を用いた地震前・中・後の一連の情報処理判断システムの開発
1997 - 1998
Grant amount(Total)：2200000, Direct funding：2200000
Grant number：09875107
Reinforcement of Program Package ILAS for Seismic Examination of Lifelines and Its Application to Main Cities Considering Regional Differences
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), 1995 - 1996
KAWAKAMI Hideji; SATO Masayuki; NODA Shigeru; MOGI Hidenori, Saitama University
Grant amount(Total)：6100000, Direct funding：6100000
The computer program ILAS (Intergrated Lifeline Analysis System) has been developed and reinforced for lifeline engineers. The ILAS is basically a program designed for analyzing earthquake risk in lifeline systems, and it includes many of the methods and algorithms for calculations proposed by researchers. The program. ILAS.is written in FORTRAN IV.and is composed of eight parts. (1) estimation of physical damage to each component of a lifeline system due to earthquake ; (2) seismic risk analysis on system connectiyity ; (3) seismic risk analysis on systemserviceability ; (4) sensitivity analysis and importance measures ; (5) simulation of restoration process.and proper disposition of personnel ; (6) inter-chain effect of lifeline systems ; (7) modeling of subordinate systems ; and (8) graphic representation. The program is applied to several example cities.
Grant number：07558055
Proposal of Space-time Variation of Input Earthquake Ground Motion to Underground Structures Based on Results of Analysis of Array Observation Records of Earthquakes
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), 1995 - 1996
KAWAKAMI Hideji; MOGI Hidenori, Saitama University
Grant amount(Total)：2100000, Direct funding：2100000
Records of strong motion are often used as the ground motion inputs in earthquake analysis and in the design of structures. The design of underground structures, however, requires more than just the time history at any particular point on the earth's surface. It also requires the space-time variation of the ground motion. We have therefore developed several methods for generating a simulated space-time variation that includes strong ground motions recorded at observation points. This simulated variation is characterized by an apparent velocity and by a coherence function. Here we presented a case study using motion recorded during the 1995 Kobe earthquake.
Grant number：07650537
地形の不整形性を考慮した断層面近傍の地盤ひずみ解析
1995 - 1995
Grant amount(Total)：900000, Direct funding：900000
Grant number：07750553
