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澜沧—耿马震区构造能流图象研究 总被引:1,自引:0,他引:1
根据澜沧-耿马震区构造能流图象的研究,其结果表明震产生了两条长度分别为42公里、55公里的北西向主破裂,同时产生了几北东-近南北向的次级破裂。通过与宏观资料的对比,可观看出构造能流图象和震害分布具有较好的一致性。 相似文献
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IntroductionTheearthquakesourcespectrastudiesmaybetracedbacktolate1960s(Aki,1967;Brune,1970;Hanks,1979).Foritsimportanceinstr... 相似文献
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在震前对澜沧—耿马地震带大震复发周期为47年的研究基础上,确认滇西南地区出现了预释放加速段、一个孕震区和显著地震有序向源迁移的演变过程等这些大震孕育并进入中短期阶段的标志。并应用这些特征,对1988年11月6日的澜沧7.6级、耿马7.2级地震进行了预测,同时对澜沧—耿马地震带下一个新的强震活跃期的时间和可能发震的断层作了估计,提出了强震活跃期中大震孕育短临阶段预测可参考的思路。 相似文献
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Hui Wang Zuji Qiang Zhuzhong Yuan Yanglong Wang Hua Zhang Xiang Zhao Yishan Gu 《地震学报(英文版)》1992,5(2):343-354
On November 6, 1988, two earthquakes with magnitude>7 occurred on the Lancang-Gengma fault zone in south-west China. The extensive
destruction and loss of lives resulted mainly from widespread collapse of unreinforced masonry and mud brick structures; the
maximum preliminary intensity of the Lancang earthquakes was IX on the Chinese scale, which is similar to the Modified Mercall
scale, and the highest preliminary intensity of the Gengma earthquake was probably X.
The surface manifestation of tectonic activity of the Lancang earthquake was the occurrence of the earthquake-related extensional
ground cracks and small fault scarps in the epicentral region. The cracks with small fault scarps occurred mainly in four
relatively continuous north-northwest-trending linear zones that ranged from a few hundred meters to 6 km in length. The area
within which the cracks and small scarps occurred is 35 km long by 3 km wide. The maximum net throw and the dextral horizontal
offset were 1.5m and 1.4m, respectively.
Clear evidence of new surface faulting caused by the Gengma earthquake includes a series of relatively continuous north-northwest-trending
linear ground crack zones and a 5 km long section of fault scarps. The total length of the surface rupture zones of the Gengma
earthquakes is about 24 km, with 3.5m maximum net throw and 3m maximum right-lateral slip.
Both earthquakes were associated with surface faulting showing a combination of normal and right lateral motion. The distribution
of seismic intensities and surface rupture characteristics of these two earthquakes are discussed in this paper.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 344–353, 1991.
The research project was performed out under the direction of Professors. Xingyuan Ma and Yuntai Chen, and the field investigation
was performed with help of Kui Jiang and Junchang Zhang of the Seismological Bureau of Yunnan Province. Here the authors express
great appreciation. 相似文献
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继文献〔1〕和①,本文作者以1988年11月6日云南省澜沧、耿马地区发生的7.6、7.2级地震为例,采用复发周期时空扫描的方法、对地震预报中短期预报的方法进行了追踪研究。结果表明大震前的异常是清楚的。异常分为两个阶段:第一阶段是外围异常阶段,震前逐步形成外围异常、形如围空、然后是外围异常逐步消失;第二阶段为极震区附近异常的逐步增强、扩大与稳定直至发震。看来采用复发周期时空扫描的方法是可以预报某些强震的。 相似文献
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It has been observed for a long time that the high-frequency fall-off constant of source spectra is about 2 for "large" earthquakes and about 3 for "small" earthquakes. For earthquakes between "large" and "small", the highfrequency fall-off constant is not an integer and varies with the size of the earthquake. In this article such a variation is explained in the perspective of the scaling of stress drop, which proposes a new approach to the study of the scaling of stress drop using seismic data with lower quality of completeness and high-frequency characteristics. The study on the source spectra of the aftershocks of the 1988 Lancang-Gengma, Yunnan, China earthquake shows that the high-frequency fall-off of source spectra and its variation with the size of earthquake can be well explained by the model that for "large" earthquakes the stress drop is a constant while for "small" earthquakes the stress drop increases with the size of the earthquake. 相似文献
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在分析构造应力场最大主应力方向和断层走向之间的夹角与断层错动关系的基础上,同时还考虑断层的几何特征,错动性质以及应力场状态等因素,提出以断怪启动系数K值来定量表征处在相同构造尖力环境中,不同走向的活动断裂的活动程度,并以1988年澜沧-耿马大震序鲁为例,计算了大震和强余震震源机制节面的断层启动系数,对震区主要活动断裂在近似情况下也计算了断层启动系数,以此在结合地震破裂带等资料对大震和强余震的发震断 相似文献
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Based on the observation data, it is found that the Lancang-Gengma earthquake sequence is resulting from the propagation of
a nonuniform fracture system in which the lengths and strikes of fractures are different from each other, the stress field
and medium condition around fractures are also heterogeneous. Therefore, a mechanical model simulating suitably the fracture
processes of the Lancang-Gengma earthquake sequence is suggested in this paper. The fracture criterions and computation method
for elastic fracture and elasto-plastic fracture are studied. The stress intensity factor, strain energy release rate and
J-integral are evaluated respectively. The forward and inverse method jointing a variety of observation data to determine
the earthquake fracture processes is also developed in this paper.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,14, 463–471, 1992.
This project was sponsored by the Chinese Jonit Seismological Science Foundation. 相似文献