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研究了汶川8.0级地震前四川地区模拟和数字地电、地磁类观测资料。四川地区地电6台站的26测项模拟观测,在汶川8.0级地震前仅出现1项中期异常,异常台站比1/6=0.17;异常测项比为1/26=0.04。对"九五"到"十五"期间四川地区数字化改造或数字地电观测资料,没有分析检测出异常项。四川地区6个台的地磁垂直分量整点值的日变形态在震前2天出现波谷分裂的异常现象,由于平时出现此类异常频繁,若用于预测无统计学的显著意义。可见汶川8.0级地震前四川地区地电和地磁类观测资料结果出现的异常现象比例是极低的。同时对疑似或有争议的异常测项进行分析说明,对汶川8.0级地震前电磁类异常少的原因进行了讨论。 相似文献
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《中国科学:地球科学》2018,(6)
正付金华,教授,博士,享受政府特殊津贴,李四光地质科学奖获得者。长期从事鄂尔多斯盆地油气综合地质及勘探技术应用研究工作,主持和参加国家、中石油科技项目30余项,获"国家科技进步"一等奖2项、二等奖1项,"省部级科技进步奖"30余项。发表SCI、EI收录论文50余篇,出版专著3部。致密油是一种重要的非常规油气资源。中国陆相盆地致密油资源丰富,勘探开发潜力巨大,其中鄂尔多斯盆地三叠系延长组长7段致密油是陆相盆 相似文献
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正2017年12月25日,山东省举行"透明海洋"科技创新工程新闻发布会。山东省科技厅巡视员徐茂波在会上表示,实施4年的山东"透明海洋"科技创新工程已取得阶段性成绩,以深海探测突破为代表,该工程斩获了三项世界首创性技术,研制出两项填补国内空白的技术,并有两项技术打破国外垄断。实现从近海走向深海的重要科技支撑建设海洋强国和海洋强省,首先要关注海洋安全,这关乎国家安全,关乎21世纪海上丝绸之路的发展,是 相似文献
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2016年1月21日青海门源MS 6.4地震是甘青地区自2013年7月22日甘肃岷县漳县6.6级地震后发生的最大震级地震,其震中距宁夏边界230 km。通过梳理震前宁夏地区地震活动异常和地球物理观测资料异常发现,震前存在测震学异常2项;地球物理观测资料异常6项,其中,形变异常4项,地下流体异常2项。5项异常为中长期异常,2项测震学异常和甘盐池井水温异常为短期异常,无临震异常出现。 相似文献
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用中国钻孔应变台网资料检验大震“前驱波” 总被引：2，自引：0，他引：2
利用中国钻孔应变台网的13个台站观测精度达10-10～10-8量级TJ式钻孔体应变仪观测资料, 深入分析2004年12月23日澳大利亚麦阔里岛MS8.0和2004年12月26日印尼苏门答腊MS8.9大震前应变变化, 对这两次地震"前驱波"进行了客观地检验. 用高通滤波消除了周期大于128 min的固体潮汐影响, 用回归分析方法消除了气压干扰. 用小波变换方法将2～128 min信号分解到6个不同频段进行分析. 结果显示, 该方法能提取出信号中微弱变化信息. 根据小波变换提取的类似"前驱波"基本特征, 提出"超限率"分析方法检验小波分解的细节部分. 对所有细节部分的超限率时间序列的回归直线斜率进行统计, 得出了平均值和标准差, 分析了正负比. 这3项统计数据显示, 大震前15 d之内不能普遍检测到"前驱波". 相似文献
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Martin J. Haig 《地球表面变化过程与地形》1979,4(2):183-189
Ground retreat was monitored on two vegetated and two unvegetated profiles over a five-year period. The average annual retreat of the two unvegetated profiles was 5.84 mm and 3.62 mm; that of the two vegetated profiles 2.34 mm and 2.07 mm. Slope evolution was controlled by the mid-slope-ward migration of two zones of accelerated erosion and the resulting replacement of a central rectilinear slope segment by the upper and lower slope elements. 相似文献
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An approximation approach of seismic analysis of two‐way asymmetric building systems under bi‐directional seismic ground motions is proposed. The procedures of uncoupled modal response history analysis (UMRHA) are extended to two‐way asymmetric buildings simultaneously excited by two horizontal components of ground motion. Constructing the relationships of two‐way base shears versus two‐way roof translations and base torque versus roof rotation in ADRS format for a two‐way asymmetric building, each modal pushover curve bifurcates into three curves in an inelastic state. A three‐degree‐of‐freedom (3DOF) modal stick is developed to simulate the modal pushover curve with the stated bifurcating characteristic. It requires the calculation of the synthetic earthquake and angle β. It is confirmed that the 3DOF modal stick is consistent with single‐degree‐of‐freedom modal stick in an elastic state. A two‐way asymmetric three‐story building was analyzed by UMRHA procedure incorporating the proposed 3DOF modal sticks. The analytical results are compared with those obtained from nonlinear response history analysis. It is shown that the 3DOF modal sticks are more rational and effective in dealing with the assessment of two‐way asymmetric building systems under two‐directional seismic ground motions. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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选取中国地磁台网中6个地磁台站基线值对比分析.结果表明,两套绝对观测仪器对同一分量所定出的两条基线,在经过墩差和仪器差改正之后,仍不能完全重合,D、H、Z三分量的基线值差值存在明显的起伏变化.初步判断,造成两套仪器基线值差值变化的原因很可能为两仪器所在墩差的变化,也就是说,在同一个观测区的不同点位,地磁场的差值也在不断变化. 相似文献
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Wang Xinling 《中国地震研究》2006,20(1):37-49
INTRODUCTIONEarthquake sequence is a series of centralized earthquake events in space-time after a largerearthquake.Since these earthquake events occur in a small space and are sequential in one specialtime,their seismogenic structure,mediumcharacteristics and earthquake mechanisms must be similar.By studying one earthquake sequence,the seismic activitytrend after a large earthquake can beconjectured.Some characteristics of the earthquake source development process and physic states canal… 相似文献
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Wang Xinling 《中国地震研究》2006,20(1):37-49
The Yao＇an Ms6.5 earthquake occurred on Jan. 15, 2000 and the Yongsheng Ms6.0 earthquake occurred on Oct. 27, 2001 in Yunnan Province, China. They are both located in the middle of the Dian block. Their epicenters are close to each other, the tectonic and strain characters of the earthquakes were similar, and there were many aftershocks after the two main shocks. In order to further study the spatial-temporal distributions and fault rupture characters of the main shocks and aftershocks, the latter are located using the Geiger earthquake location algorithm （Geiger） and the double difference earthquake location algorithm （DD） based on the seismic phase data of the two earthquake sequences. They were recorded by two Near Source Digital Seismic Networks （YNSSN and YSNSSN） deployed by the Yunnan Seismological Bureau （YNSB）. Then, two main shock parameters were relocated using DD based on the data of larger magnitude aftershocks and the two main shocks that were recorded by the Kunming Regional Digital Seismic Network （KMSN）. Combining the spatial- temporal distributions of the two earthquake sequences, the tectonic and strain characters of earthquakes, the rupture processes of the two aftershock sequences along faults are analyzed and discussed contrastively. 相似文献
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特殊条件下的物探检测及其应用效果 总被引：6，自引：2，他引：4
长江三峡工程永久船闸高边坡卸荷影响带和清江水布垭导流洞洞壁松动圈对物探检测来说是两个极具代表性的工程问题．而地震波CT和声波测试又分别代表着最前沿和最常规的物探检测方法．本文应用地震CT和声波测试方法对上述两个问题进行了探测研究．探测结果表明,在解决某些特殊条件下的地质问题时,根据现场实际情况选定合适的地球物理方法可以取得事半功倍的效果． 相似文献
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含裂隙双相各向异性介质中的地震波传播 总被引：5，自引：0，他引：5
基于各向异性介质和含裂隙双相介质中的地震波传播理论,导出了具有四阶对称轴的含裂隙双相各向异性介质的本构关系与波传播的运动方程．指出在含裂隙双相各向异性介质中可能传播６种类型的准纵横波,即快纵波ＱＰ１,慢纵波ＱＰ２,两个分裂的快横波ＱＳＶ１,ＱＳＨ１和两个分裂的慢横波ＱＳＶ２,ＱＳＨ２．并以平面波传播为例作了进一步分析 相似文献