Study of the characteristics of earthquake precursory anomalies of He and H₂ Beijing No. 2 Cotton Mill well and their relation with earthquakes     

Shu-Quan Fan  Sheng-Hu Su  Ni Li 《地震学报(英文版)》1993,6(4):959-969

This paper systematically summarized the relation of the abnormal change of He and H₂ dissolved gasses in deep hot-water well at Beijing No. 2 Cotton Mill and their relation with seismicity of the region. An empirical formula for the relation of the precursory anomaly of He and H₂ gasses with the magnitude and occurrence time of earthquake has been derived. Two events of magnitude greater than 5 in North China had been successfully predicted by using this formula. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 490–497, 1993.  相似文献   

门源、共和地震前甘青交界地区浅层地温异常时空分布特征   总被引：5，自引：0，他引：5  

韩友珍  毛可 《地震工程学报》1993,15(4):30-35

本文研究了１９８６年门源６．４级地震和１９９０年共和７．０级地震地，１９８０－１９９０年青海省东北部甘青交界地区浅层地温场的时空分布特征。主要结论如下：门源地震前，１９８９年出现以青海湖为中心的浅层地温增温区，其中从湟源－门源－带形成椭圆形地温高值区，１９８６年访温区地温下降；共和地震和前从１９８７年出现大面积、长时间浅层地温增高区。增温幅度较大的地区集中在青海省湟源－共和－兴海－线。距震中区较远  相似文献   

山西侯马—河津一带西汉初期的强烈地震   总被引：1，自引：0，他引：1  

陈国顺  黄振昌 《中国地震》1993,9(3):276-285

1989年至1987年间,在国家地震局招标合同项目《全新世古地震的研究方法和确定标志》工作中,笔者在山西省侯马至河津一带,发现了大规模地震断层和许多古地震遗迹。本文就是在此基础上,对黄土中的古地震遗迹进行了总结,分析研究了古地震的分布和特征,讨论了侯马至河津一带西汉初期强震的规模和震中。  相似文献   

矿震及其前兆初探   总被引：11，自引：1，他引：11  

车用太  宁挺文 《中国地震》1993,9(4):334-340

本文通过对山东霜矿的矿震（冲击地压）发生条件、时空分布与某些征兆的调查研究，提出了利用矿震及其前兆观测探索天然地震前兆与预报方法的初步设想。  相似文献   

常熟——太仓5.1级地震后地震谣言和恐震心理剖析     

张邦柱  沈自励 《山西地震》1993,(1):50-52

从1990年2月10日江苏省常熟－－太仓5.1级地震发生后的地震谣言着手，剖析了其发生的原因和消除群众恐震心理的措施和对策。  相似文献   

1614年平遥—榆社间61／2级地震的讨论     

武烈 《山西地震》1993,(3):30-34

通过对1614年平遥榆社间6(1/2)级地震的进一步研究,认为前人确定这次地震时所用的史料疑点较多,所确定的基本参数也问题较大.得出是两次地震事件的结论:一次是1614年10月15日(万历四十二年九月十三日),地点武乡,震级约为5(1/2)级;一次是1614年10月23日(万历四十二年九月二十一日),地点榆社,震级约5(3/4)级.  相似文献   

2011年日本M_W9.0地震对沂沭断裂带及其两侧地区地壳运动的同震影响研究          下载免费PDF全文

朱成林  甘卫军  贾媛  殷海涛  肖根如  李杰  梁诗明  张海平 《地球物理学报》1954,63(10):3698-3711

2011年日本M_W9.0地震（简称日本地震）后沂沭断裂带及其两侧地区地震活动显著增强,研究日本地震对该地区地壳运动及地震潜势的影响十分必要.为此,本文通过112个连续GPS观测站获取了研究区高空间分辨率的日本地震同震形变场并得到如下认识：（1）8个定点地球物理观测的同震响应验证了本文同震形变场的可靠性;日本地震的东向拉张使研究区整体上处于张性同震应变状态,但存在局部挤压区域,其中莱州湾至海州湾的挤压条带穿过沂沭断裂带并对断裂带南北两段产生了不同的同震作用,对南段具有拉张作用,对北段产生挤压作用;（2）同震形变场在鲁东隆起和鲁西断块产生了显著的剪应变,地震b值显示上述区域的构造应力在日本地震后增强,因此同震形变场可能改变了这些区域的应力特征;（3）地震矩张量叠加分析显示,同震形变场短期内对鲁西断块、鲁东隆起区和沂沭断裂带南段累积了地震矩,可能有助于上述区域在日本地震以后的地震活动增强;日本地震对沂沭断裂带北段的地震矩具有释放作用,或许是该区域地震活动减弱的原因.  相似文献   

工程结构抗震设防标准的决策分析   总被引：16，自引：4，他引：12  

洪峰  谢礼立 《地震工程与工程振动》1999,19(2):9-14

提出了工程结构抗震设防标准的决策方法,该决策方法以结构初始造价分析和地震损失分析为基础。建立了结构初始造价与设计烈度的关系,并提出了地震损失的估计方法。使用该决策方法导出了最佳设计烈度和重现周期的解析表达式,从而得出了对抗震设计具有重要意义的结论。  相似文献   

The initial subevent of the 1994 Northridge, California, earthquake: Is earthquake size predictable?   总被引：1，自引：0，他引：1  

D. Kilb  J. Gomberg 《Journal of Seismology》1999,3(4):409-420

We examine the initial subevent (ISE) of the M 6.7, 1994 Northridge, California, earthquake in order to discriminate between two end-member rupture initiation models: the preslip and cascade models. Final earthquake size may be predictable from an ISE's seismic signature in the preslip model but not in the cascade model. In the cascade model ISEs are simply small earthquakes that can be described as purely dynamic ruptures. In this model a large earthquake is triggered by smaller earthquakes; there is no size scaling between triggering and triggered events and a variety of stress transfer mechanisms are possible. Alternatively, in the preslip model, a large earthquake nucleates as an aseismically slipping patch in which the patch dimension grows and scales with the earthquake's ultimate size; the byproduct of this loading process is the ISE. In this model, the duration of the ISE signal scales with the ultimate size of the earthquake, suggesting that nucleation and earthquake size are determined by a more predictable, measurable, and organized process. To distinguish between these two end-member models we use short period seismograms recorded by the Southern California Seismic Network. We address questions regarding the similarity in hypocenter locations and focal mechanisms of the ISE and the mainshock. We also compare the ISE's waveform characteristics to those of small earthquakes and to the beginnings of earthquakes with a range of magnitudes. We find that the focal mechanisms of the ISE and mainshock are indistinguishable, and both events may have nucleated on and ruptured the same fault plane. These results satisfy the requirements for both models and thus do not discriminate between them. However, further tests show the ISE's waveform characteristics are similar to those of typical small earthquakes in the vicinity and more importantly, do not scale with the mainshock magnitude. These results are more consistent with the cascade model.  相似文献   

On seismic strengthening area before strong and great shocks and its mechanism   总被引：1，自引：0，他引：1  

宋治平  梅世蓉  尹祥础 《地震学报(英文版)》1999,12(3):298-305

IntroductionI.thasbeenpayingattentiontotheanomalousphenomenonbyseismologiststhattheearthquakeactivityoftenstrengthensinacertainspaceandduringacertaintimearoundthesourceareabeforeastrongearthquake.Mogi(1969)pointedoutthataringdistributiveareaofthestrengthenedearthquakeactivityoftenappearsaroundthesourcearea10to20yearsbeforegreatshock,whichcalledaringphenomenon(or"doughnut").Afterthat,otherscholarsreportedinsuccessionthatringdistributionofearthquakeactivityoccurredbeforeastrongertquakeorevenbefo…  相似文献