地下流体前兆模糊识别     

许秋龙 《内陆地震》1995,9(3):286-290

在地震的孕育、发生到发展的过程中，可能会出现多项地下流体观测量不同程度的前兆异常变化，这些异常变化是复杂多样、模糊不清的。引入模糊识别法对一定区域和一定时间段的地下流体观测数据进行了分析和处理，表明模糊识别法可较好地识别和分辨出地下流体前兆的地震异常。  相似文献   

新疆及其邻区强震活动与趋势预测     

高国英  韩月鹏 《内陆地震》1995,9(4):357-362

对１８８０￣１９９３年新疆及邻区７级以上强震活动特征进行了分析讨论，认为研究时段内７级以上强震活动有明显的活跃与平静交替现象。研究时段内的强震活动经历了５个轮回，每个轮回包括一个平静幕和一个活动幕，每个活动幕都有相对的主体活动区，主体活动区和７级以上单个强震都具有沿西昆仑－南天山－北天山－阿尔泰地震带往返迁移的特征。各地震带６级以上地震活动也具有明显的由西南向北东整体迁移的特征，并且这种时、空、强  相似文献   

模拟地震的弹簧滑块模型的混沌运动   总被引：2，自引：0，他引：2  

季颖  高原  陈颙 《东北地震研究》1995,(1)

我们构造了一种自由度为２的双弹簧滑块系统，讨论模型参数的不均匀性和滑块间的相互作用与复杂现象的关系。假定滑块在所受力小于其静摩擦力时保持静止，因此，只有发生了滑动，两滑块所受力之差才改变。如果我们以两滑块受力之差为变量，就可以构造一种一维的映射。这种映射直观地显示了系统的演化，反映了方程终态解的形态。结果表明，用混沌运动来描述地震现象可能是较为合理的。  相似文献   

Paleoseismicity and Segmentation Along the Active Fault at the Northern Boundary of Huailai-Zhuolu Basin,Hebei Province     

Ran Yongkang  Fang Zhongjing  Li Zhiyi  Wang Jingbo  and Li RuchengInstitute of Geology  SSB  Beijing  China 《中国地震研究》1995,(1)

The northern boundary fault of Huailai-Zhuolu basin,Hebei Province,has a total length of 58 km and a general strike of NE.The geometry and feature of activity of the 5 segments of the fault greatly differ from each other.17 paleoseismic events have been recognized within 11 trenches excavated along the different segments of the fault.It is found that each segment is characterized by its distinct recurrence of paleoearthquakes.The recurrence intervals of strong earthquakes for each segment are 3500-7000 a for the shortest and 17,000-20,500 a for the longest.However,the recurrence interval of strong earthquakes for whole fault ranges between 750-8500 a.The boundary of the segments can be recognized as the junction,gap,bending,jog and salient of the fault.The length of the segment ranges between 7.5-14 km.  相似文献   

Theory and Experimental Results about the Application of Remote Sensing to Earthquake Prediction     

Deng Mingde  Cui Chengyu  Geng NaiguangComprehensive Observation Brigade  SSB  Beijing  ChinaInstitute of Remote Sensing Application  Academia Sinica  Beijing  ChinaInstitute of Geophysics  SSB  Beijing  China 《中国地震研究》1995,(2)

In this paper,the theory for applying remote sensing to earthquake prediction has been elucidated and an experiment has been made.Through the experiment,it has been found that the characteristics and temperature of infrared radiant of rocks vary as a function of rock stress,the order of magnitude of radiance variation is 10-5(W/cm2 sr um),the amount of variation of the radiant temperature is 0.2℃~0.8℃ and some significant precursor information has been discovered.The experiment has verified preliminarily that the advanced technology of remote sensing can be applied to earthquake prediction.  相似文献   

Intensifying Earthquake Prediction in the Light of Action of International Decade for Natural Disaster Reduction     

Gao Wenxue  Gao QinhuaState Seismological Bureau  Beijing  China Institute of Geology  SSB  Beijing  China 《中国地震研究》1995,(2)

This paper is a review on earthquake prediction and forecast research,progress in earthquake prediction work and pre-estimation of earthquake hazard degree in China in recent years.It indicates that China is the first country,the government of which has promoted and organized the state administration department on reduction of seismic hazards and ensured the socialization of earthquake prediction and forecast in the world.A program of earthquake prevention and protection and hazard reduction based on the results of research on earthquake occurrence regularities and prediction of earthquake preparation trend has been completed,and hence the socialization of results of earthquake prediction and forecast research can be expected to be in practice.The practical seismological works in last 20 years indicate that the earthquakes are not considered to be unpredictable,but it is a challenge remaining to be accepted.We are willing to cooperate with all friends who are engaged in earthquake prediction and forecas  相似文献   

Field survey of the 1994 Mindoro Island,Philippines tsunami   总被引：2，自引：0，他引：2  

Fumihiko Imamura  Costas E. Synolakis  Edison Gica  Vasily Titov  Eddie Listanco  Ho Jun Lee 《Pure and Applied Geophysics》1995,144(3-4):875-890

This is a report of the field survey of the November 15, 1994 Mindoro Island, Philippines, tsunami generated by an earthquake (M=7.0) with a strike-slip motion. We will report runup heights from 54 locations on Luzon, Mindoro and other smaller islands in the Cape Verde passage between Mindoro and Luzon. Most of the damage was concentrated along the northern coast of Mindoro. Runup height distribution ranged 3–4 m at the most severely damaged areas and 2–4 in neighboring areas. The tsunami-affected area was limited to within 10 km of the epicenter. The largest recorded runup value of 7.3 m was measured on the southwestern coast of Baco Island while a runup of 6.1 m was detected on its northern coastline. The earthquake and tsunami killed 62 people, injured 248 and destroyed 800 houses. As observed in other recent tsunami disasters, most of the casualties were children. Nearly all eyewitnesses interviewed described the first wave as a leading-depression wave. Eyewitnesses reported that the main direction of tsunami propagation was SW in Subaang Bay, SE in Wawa and Calapan, NE on Baco Island and N on Verde Island, suggesting that the tsunami source area was in the southern Pass of Verde Island and that the wave propagated rapidly in all directions. The fault plane extended offshore to the N of Mindoro Island, with its rupture originating S of Verde Island and propagating almost directly south to the inland of Mindoro, thereby accounting for the relatively limited damage area observed on the N of Mindoro.  相似文献   

邢台地震房屋破坏率的正态性X￣2检验     

程家喻 《地震地质》1995,17(3):285

对１９６６年３月８日和３月２２日台地震中的房屋破坏情况进行统计，计算了地震区主要房屋土坯墙房在Ⅳ～Ⅸ度中的毁坏率、严重破坏率和中等破坏率。通过Ｘ￣２检验得出，Ⅵ度和Ⅸ度区房屋毁坏率、严重破坏率和中等破坏率的分布均服从正态分布  相似文献   

黑龙江省1986年德都中强地震震源参数   总被引：2，自引：1，他引：2  

张凤鸣  伊福兰 《东北地震研究》1995,(4)

本文应用体波频谱估算地震矩、应力降、震源尺度、破裂传播速度、断层平均位错等震源参数。并讨论现代构造运动、震源机及地震与火山活动关系。  相似文献   

考虑地基土液化影响的桩基高层建筑体系地震反应分析   总被引：5，自引：2，他引：5  

陈国兴  谢君斐 《地震工程与工程振动》1995,15(4):93-103

本文建立了土体－结构体系地震反应分析的混合有限元法，并研究了地基土液化对地震反应的影响。本方法把土体－结构体系简化为一个完整的体系，该体系由梁（柱）单元、剪切杆单元、刚体单元、平面四边形等参单元与三角形单元、界面单元的任意组合来模拟。桩与上部结构材料视为线弹性体，土介质视为非线性材料。土的静应力－应变关系之间的非线性用邓肯一张模型来描述；土的动应力－应变关系之间的非线性和振动孔隙水压力对土的软化效  相似文献