中国东南沿海地震带大震重复性和大震减震作用   总被引：2，自引：0，他引：2  

陈家超  冯霞英 《华南地震》1992,12(3):29-35

本文从物质分异的角度出发并利用现代小震活动资料,讨论了东南沿海地震带历史大震震源区及其附近,今后一段历史时期内是否有大震(M≥0)震源区大震重复性和大震减震作用问题。结果表明,这些历史震源区目前还处在减震阶段,今后一段时间只能以小震或中强地震的活动特点来显示这一弱化区。  相似文献   

蒲江—新津—成都—德阳断裂带——成都平原内一条代表性弱活动地震带的地震地质特征     

钱洪  唐荣昌  马声浩 《四川地震》1992,(4)

活断层是地震的潜在策源地。然而不同的活断层上地震潜在能力有极大的差别。客观地评价活断层上地震潜在能力不仅是地震预报研究的需要,对国民经济建设的布局和抗震决策也极为重要。在这个意义上,对弱活动性断裂的研究与对强活动性断裂的研究具有同样的重要性。本文以弱活动的蒲江—新津—成都—德阳断裂带为例,讨论了该断裂的晚第四纪活动性,断裂带的地质结构以及断裂的切割深度等因素对该断裂带地震潜在能力的可能影响。  相似文献   

新疆7级强震前的围空特征   总被引：1，自引：0，他引：1  

白超英  曲延军 《内陆地震》1992,6(1):12-18

讨论了新疆40年代以来所发生的8次7级强震前的围空现象。结果表明,除1974年巴里坤7.1级地震因资料不全外,7级强震前均出现明显的围空现象。研究发现,这种围空一般都经历了三个过程,时间通常为10—20年。最后分析讨论了7级强震前围空的特征以及判别指标。这将为今后确定强震危险区提供依据。  相似文献   

震兆图象的远程遥联性     

王泽皋  孙佩卿 《内陆地震》1992,6(2):121-130

通过研究我国一些震情窗口成组震兆与大陆及边邻Ms≥7.0级地震的整体链式活动的对应关系,指出这些窗口的成组震兆具有远程遥联的特点。对这种特点的深入研究将有可能为我国大陆及边邻地区地震活动的总体大形势作出估计。  相似文献   

汾渭地震带的地震活动性   总被引：2，自引：0，他引：2  

苏怡之  王进英 《内陆地震》1992,6(2):143-150

根据历史强震与现代地震的资料,研究、分析了汾渭地震带强震及中、小地震的时、空、强分布特征,对该带未来地震危险性进行了探讨。  相似文献   

On the seismic regime network method     

Zegao Wang  Yan Guo  Shulian Li  Yinghua Dai  Peiqing Sun 《地震学报(英文版)》1992,5(2):245-255

In this paper, based on the previous study of practical use of seismic regime windows and seismic regime belts, the problem of establishing a “seismic regime network” consisting of “windows” and “belts” is further posed and discussed according to the observed fact that many “windows” and “belts” make responses to one earthquake. For the convenience of usage, the “seismic regime network” is divided into two classes, the first class and the second one. The former can be used in tendency prediction for long-term seismic activity in a large area, the latter used in short-term prediction in a small area. In this paper, after briefly discussing the physical significance of “seismic regime network”, it is pointed out that this simple and easily used method can be used to observe and extract seismic precursory information from a large area before a great earthquake, thus it can provide a reliable basis for the analysis and judgement of seismic regime tendency in time and space. No doult, this method is of certain practical significance. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 161–169, 1991. The English version of this paper is improved by Prof. Shaoxie Xu.  相似文献   

Use of the mantle magnitudeM m for the reassessment of the moment of historical earthquakes     

Emile A. Okal 《Pure and Applied Geophysics》1992,139(1):59-85

The mantle magnitudeM _m is used on a dataset of more than 180 wavetrains from 44 large shallow historical earthquakes to reassess their moments, which in many cases had been previously estimated only on the basis of the earthquake's rupture area. We provide 27 new or revised values ofM _o, based on the spectral amplitudes of surface waves recorded at a number of stations, principally Uppsala and Pasadena. Among them, and most significantly, we document a large low-frequency component to the source of the 1923 Kanto earthquake: the low-frequency seismic moment is 2.9×10²⁸ dyn-cm, in accord with geodetic observations. On the other hand, we revise downwards the seismic moment of the 1906 Ecuador event, which did not exceed 6×10²⁸ dyn-cm.Finally, the study of the 1960 Chilean and 1964 Alaskan earthquakes whose exceptionally large moments are properly retrieved throughM _m measurements, serves proof that this approach performs flawlessly even for the very greatest earthquakes, and is therefore successful in its goal to avoid the saturation effects plaguing any magnitude scale measured at a fixed period.  相似文献   

The expert system for earthquake prediction (I)—the overall design and main structure     

Biquan Wang  Zuyin Chen  Shutian Ma  Hongshun Fan 《地震学报(英文版)》1992,5(3):447-457

The Expert System For Earthquake Prediction (ESEP) is summarized in this paper. ESEP embraces three subsystems: long-middle term prediction system, annual prediction system and middle-short term prediction system. Each of the subsystems is composed of seven modules: the controlling module, the data base module, the expert knowledge base module, the method base module, the fact preparation module, the reasoning and decision-making module and the plotting and displaying module. The reasoning model ESEP/R and the knowledge expression model ESEP/K are set up in the ESEP, and new evidence combinations, CON (confine), W (weigh), and SYN (synthesize), have been proposed. The distinctive features of the ESEP are: (1) systemized; (2) several experts’ knowledge can be synthesized; (3) a large amount of data and experts’ experience is embraced; (4) four reasoning models and the synthetic decision-making technic are adopted; (5) several software environments are used; (6) modularization; and (7) possessing the friendly user interfaces. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,14, 1–8, 1992.  相似文献   

浑江末前寒武纪丝状藻类及其环境意义   总被引：10，自引：1，他引：10  

高林志  乔秀夫 《地质论评》1992,38(2):140-148

本文初步探讨了吉林浑江晚前寒武纪丝状藻类与沉积环境的关系。这些丝状藻类产自晚前寒武纪不同层位,大多属蓝绿藻类。通过对丝状藻类整体面貌和个体丰度的分析,笔者将其划分为三类即:藻席型、孤立生存型和其间的过渡类型。根据对现代丝状藻类生态及环境的研究,采取比较古生物学的方法,具体讨论了浑江地区晚前寒武纪丝状藻类的指相意义。根据沉积学与事件地层记录分析的沉积环境模式与对丝状藻类环境分析的结果是一致的。  相似文献   

The experimental research on b value of AE for the rock specimens with pre-existing crack or notch under uniaxial compression     

Hong Li  Xiangchu Yin  Shiyu Li  Jihan Li 《地震学报(英文版)》1992,5(4):867-875

A lot of researches onb value have been made in seismology. Since the 1960’s Mogi, Scholz and others have studied AE of rock specimens in laboratory and discovered that it is related to natural earthquakes. All former researchers used integral specimens to studyb value in the laboratory. However a major earthquake is usually related to a existing seismic-fault in that area. For this reason, a series of fracture experiments with rock and glass specimens having pre-existing crack or notch is performed in order to examine the effect of preexisting crack tob value. The experimental results show that theb value begins to decrease as soon as the initiation of the crack and finally drop to a very low value when the specimen breaks unstably. Based on these, a brief discussion on the possible mechanism ofb value change for natural earthquakes is given. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,9, 393–400, 1987. Projects sponsored by the Chinese Joint Seismological Science Foundation.  相似文献