云南地区大震活动规律研究   总被引：9，自引：0，他引：9       下载免费PDF全文

皇甫岗  秦嘉政 《地震地质》2006,28(1):37-47

云南地区处于印度板块与欧亚板块中国大陆碰撞带的东缘,地壳运动剧烈,活动块体特征明显,中强以上地震频发,是研究大震活动规律的理想场所。通过过去一个世纪的6.7级以上地震活动的时空分布以及地震动力分析认为,云南地区存在的4个具东西交替活动特征的地震活跃期,可能是东、西部各自地震活跃与平静过程叠加的结果,100a左右可能出现1次东、西部同时爆发大震的时段;云南地区地震活动与外围地区存在较好的呼应关系,安达曼-缅甸弧形带的巨震活动对云南地区地震活跃期的启动有一定的指示意义,而云南东部强震也与四川西部大震密切相关,四川大震活动往往滞后于云南地区;中强地震连发—平静—首发大震可能是云南以东部为活动主体的地震活跃期的启动模式。这些认识对云南地区大震预测、地震机理以及板缘动力学研究会有所帮助  相似文献   

Investigation of historical earthquakes in the northeastern Fujian area     

鄢家全张志中  潘华黄玮琼  胥广银郝玉芹 《地震学报(英文版)》2006,19(3):322-332

Taking the northeastern Fujian area as an example, we provide some new technological ideas and contents for the historical earthquake investigation of significant engineering construction sites. ① Make sure the integrity of earthquake materials with reference to the regional histories of culture and disasters; ② Evaluate the influence of historical earthquakes on the basis of actual records, review and identify the epicenter location and magnitude of destructive earthquakes. The research by the new technological ideas will endue the investigation of historical earthquakes with new meanings in the cultural phylogeny and credible time domain, so as to make the results of historical earthquake research more scientific. The aim of the paper is to improve the level of historical earthquake investigation for a better service to the engineering construction.  相似文献   

宁波地震台水位、地倾斜在印尼8.7、8.5级地震中的同震变化现象     

邱永平 《内陆地震》2006,20(4):336-341

分析了浙江省宁波地震台ZK03井动水位、VS垂直摆倾斜仪资料出现的异常,认为这些异常可能是印尼8.7、8.5级地震的同震变化现象。8.7级地震后,动水位表现为水震波引起的脉冲和阶跃变化并抬高水位。垂直摆倾斜仪资料表现为形变波引起的脉冲和阶跃变化,EW向出现最大幅度约为408.328 2×10-3″的脉冲式向东振荡波,并向西出现阶跃变化;NS向出现最大幅度约为295.191 7×10-3″的脉冲式向北振荡波,并产生向北阶跃变化。8.5级地震后,动水位表现为水震波引起的脉冲。垂直摆倾斜仪资料表现为形变波引起的脉冲和阶跃变化,EW向出现最大幅度约为306.280 9×10-3″的脉冲式向东振荡波,并向西出现阶跃变化;NS向出现最大幅度约为261.565 9×10-3″的脉冲式向北振荡波。  相似文献   

用小波变换和最小二乘支持向量机方法预测华南地震区年度最大地震     

李志雄  沈繁銮  袁锡文  符干 《中国地震》2006,22(2):182-189

应用小波变换和最小二乘支持向量机（LSSVM）相结合的方法（小波-LSSVM）预测华南地震区年度最大地震。先用小波变换将地震序列分解成不同尺度水平（频率段）的子序列，再用LSSVM方法分别对各子序列建模预测，最后重构各子序列的预测结果并得到最终预测结果。经与周期图方法和LSSVM预测方法比较研究表明：模型输入量中包含地球自转速率变化的小波-LSSVM方法预测效果很好，可以用于华南地区年度最大地震预测研究，且地球自转变化与华南地震时间序列的低频部分（趋势）和高频部分（短期变化）之间存在很强的、互不相同的非线性关系。  相似文献   

Development and application of the mo-ment-ratio imaging algorithm     

黄建平  马丽  张晁军 《地震学报(英文版)》2006,19(5)

Introduction After an earthquake occurs, the regional stress field will be adjusted, the stress state in the epicenter area is relatively weak and the loaded stress at the crustal medium in the surrounding area will relatively increase due to the energy release of the crustal rupture. When several small and medium earthquakes occur, one or several new stress-concentrated areas will appear due to the effect of every event. The comprehensive effect could be related to the time, space and magni-t…  相似文献   

荷兰地震监测与研究     

赵宇彤 《国际地震动态》2006,(12):31-36

简要介绍了荷兰皇家气象研究所(KNMI)地震部所进行的地震领域的基础和应用性研究,其中包括次声研究、诱发地震研究、采矿法以及地震部所主持的欧洲地震数据交换和协调中心的工作。  相似文献   

A seismological reassessment of the source of the 1946 Aleutian 'tsunami' earthquake     

Alberto M. López  Emile A. Okal 《Geophysical Journal International》2006,165(3):835-849

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Local site effects in Ataköy, Istanbul, Turkey, due to a future large earthquake in the Marmara Sea     

Mathilde B. Sørensen  Ivo Oprsal †  Sylvette Bonnefoy-Claudet ‡  Kuvvet Atakan  P. Martin Mai  Nelson Pulido  Caglar Yalciner § 《Geophysical Journal International》2006,167(3):1413-1424

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Regional and local factors in attenuation modelling: Hong Kong case study   总被引：1，自引：0，他引：1  

A.M. Chandler  N.T.K. Lam  H.H. Tsang 《Journal of Asian Earth Sciences》2006,27(6):892-906

Seismic attenuation behaviour is controlled by a large number of wave modification mechanisms. The characteristics of some of these mechanisms are specific to a local area, whilst the remainder can be generalised to the entire seismic region. Factors representing these mechanisms are often not resolved. A new attenuation modelling approach is demonstrated in this paper (using Hong Kong as a case study), to evaluate individual regional and local wave modification factors. Shear wave velocity (SWV) information for the four prevalent geological formations found in Hong Kong was first obtained: (a) at shallow depths from instrumented boreholes; (b) at depths of up to 100–200 m from measurements using the Microtremor SPatial Auto-Correlation (SPAC) technique; (c) at depths of up to 1.5 km from the monitoring of quarry blasts; and (d) at depths from 1.5 to 8 km in the hard basement rock layers from results of seismological refraction surveys. The upper-crust amplification factor calculated from the four modelled rock SWV profiles was then combined with predicted attenuation parameters to determine the upper-crust modification factor (filter function) incorporating the local wave modification characteristics associated with Hong Kong geological formations. Such functions may then be combined with the regional attenuation characteristics in that part of the South China region. A seismic attenuation model was developed by combining the upper-crust modification factor with the regional source function of intra-plate earthquakes, based on stochastic simulations. The ground shaking model developed from the presented methodology is supported by the comparison with macro-seismic data of seven historical earthquake events affecting Hong Kong.  相似文献   

Damage due to the M_w 7.7 Kutch, India earthquake of 2001     

B.K. Rastogi   《Tectonophysics》2004,390(1-4):85-103

This paper presents a study of the damage due to the M_w 7.6–7.7 intraplate Kutch earthquake of 26 January 2001. It was a powerful earthquake with a high stress drop of about 20 MPa. Aftershocks (up to M 4) have continued for 2.5 years. The distribution of early aftershocks indicates a rupture plane of 20–25 km radius at depths of 10–45 km along an E–W-trending and south-dipping hidden fault situated approximately 25 km north of the Kutch Mainland Fault. The moment tensor solution determined from regional broadband data indicates reverse motion along a south-dipping (by 47°) fault. The earthquake is the largest event in India in the last 50 years and the most destructive in the recorded history in terms of socioeconomic losses with 13,819 deaths (including 14 in Pakistan), collapse/severe damage of over a million houses and US$10 billion economic loss. Surface faulting was not observed. However, intense land deformations have been observed in a 40×20-km meizoseismal area. These include lateral spreading, ground uplifts (about a meter), ground slumping and deep cracks. Liquefaction with ejection of sand and copious water was widespread in the Banni grassland, Rann areas (salt plains), along rivers and also in the coastal areas up to 200 km distance from the epicenter in areas of intensity VII to X+. Stray incidences of liquefaction have occurred up to distances of at least 300 km. For the first time in India, multistory buildings have been destroyed/damaged by an earthquake. The maximum acceleration is inferred to be 700 cm/s² and intensities are 1–3 units higher in soil-covered areas than expected from the decay rate of acceleration for hard rock.  相似文献