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1.
Simultaneousinversionofvelocitydistribu┐tionandinterfacepositionsSONG-LINLI1)(李松林)NING-YUANWU2)(吴宁远)ZHAN-LONGSONG1)(宋占隆)JIN-...  相似文献   

2.
Inversion of Q value structure beneath the Tibet Plateau   总被引:1,自引:0,他引:1  
InversionofQvaluestructurebeneaththeTibetPlateauJIAN-PINGWU(吴建平)andRONG--SHENGZENG(曾融生)(InstitutefoGeophysicsStateSeismologic...  相似文献   

3.
ThephysicalimplicationofcodaamplituderatioanditspossibleapplicationTIAN-ZHONGZHANG(张天中)YUN-SHENGMA(马支生)RONG-LIANGHUANG(黄蓉良)In...  相似文献   

4.
Studyonthecharacteristicsofcrust┐mantletransitionzoneinWesternYunnanProvinceHONG-XIANGHU(胡鸿翔)ZHONG-YANGLIN(林中洋)YIN-JUBIAN(边银...  相似文献   

5.
ThemechanismofregionalgravitychangesbeforeandaftertheTangshanearthquakeRUI-HAOLI(李瑞浩)JIAN-LIANGHUANG(黄建梁)HUILI(李辉)DONG-SHENG...  相似文献   

6.
Fractal research of fault gouge   总被引:1,自引:0,他引:1  
FractalresearchoffaultgougeSHUN-MEISHAO(邵顺妹)andJIN-CHANGZOU(邹瑾敞)EarthquakeResearchInstituteofLanzhou,StateSeismologicalBurea...  相似文献   

7.
LoadtideheatingmechanismofoceanichotspotsSHUN-LIANGCHI1)(池顺良),QIN-WENXI2)(郗钦文),MING-JINLUO3)(骆鸣津)andLIANGCHI1)(池亮)1)Seismolg...  相似文献   

8.
Themanufactureofathree-dimensionaltransducerusedinlaboratoryXIAO-HONGLIU(刘晓红)(InstituteofGeophysics,StateSeismologicalBureau,...  相似文献   

9.
Effectsofmagnitudeaccuracyandcomplete┐nesdataonseismichazardparametersHUI-CHENGSHAO(邵辉成),JIA-SHUXIE(谢家树),PINGWANG(王平)andYA-X...  相似文献   

10.
SimulationoftheactiveandquietperiodsofseismicityZHONG-XMNHUANG(黄忠贤)(InstituteofCrustalDynamics,StateSeismologicalBureau,Beiji...  相似文献   

11.
A systematic study on “ring phenomena” frequently occurring before great earthquakes has made in this paper, which has analyzed the features of ring distributions before 16 great earthquakes and part of large earthquakes in China and its boundary areas, and discussed their features of generality, regularity and predictive meaning. The results have showed that moderate earthquakes or larger earthquakes distribute around the epicenter like a ring from decades to hundred years before the great earthquakes of magnitude more than 7, which is a general phenomenon of great earthquakes without an exception. The active ring generally occurs in the areas from hundreds to thousands of kilometers from the epicenter (according to the magnitude). The seismicity in the ring has three basic stages with different features. in the first stage, seismicity remains at low level and the earthquakes distribute scatteredly, while the source area of the future great earthquake remains quiet; in the second stage, the seismicity strengthens, whose frequency, intensity, concentrated degree, released rate of strain and ratio of distributed area etc. increase, while the quiet area decreases or disappears; in the third stage, the seismicity is weaker than in the former stage, and the quiet area appears again. The source area surrounded by the active ring might have three periods of activity (called as early-term, medium-term and late-term foreshocks activity). The length of the quiet area undergoes the process from large to small, then to large. Therefore, we can estimate the occurring place, magnitude and seismogenic stage of great earthquake according to the area, length and the seismicity in the active ring, which is valuable to make a long-term prediction of great earthquakes. At last, we had a preliminary discussion on the mechanism of active ring formation.  相似文献   

12.
Introduction The MS=8.1 earthquake occurred in west of the Kunlun Pass on November 14, 2001. It is the greatest earthquake occurred in China since the last half of the century and is an important event in recent seismic history of China. Some specialists consider that the earthquake occurred in the area where the earthquake monitoring capability is lowest in Chinese mainland; no striking precursory seismicity was found. The study on the precursory seismicity before the earthquake has not b…  相似文献   

13.
分析2013年云南洱源5.5级地震前地震活动异常,发现地震前震中附近长达8个月M≥3.0地震平静,云南地区2013年2月4级地震连发,在震前一个半月内快速形成M≥3.0地震条带,地震当天在震中东北方距离约30 km处发生前震序列.结果表明,洱源地震的孕育、发生与大区域应力活动有关.  相似文献   

14.
A great earthquake of M S=8.1 took place in the west of Kunlun Pass on November 14, 2001. The epicenter is located at 36.2°N and 90.9°E. The analysis shows that some main precursory seismic patterns appear before the great earthquake, e.g., seismic gap, seismic band, increased activity, seismicity quiet and swarm activity. The evolution of the seismic patterns before the earthquake of M S=8.1 exhibits a course very similar to that found for earthquake cases with M S≥7. The difference is that anomalous seismicity before the earthquake of M S=8.1 involves in the larger area coverage and higher seismic magnitude. This provides an evidence for recognizing precursor and forecasting of very large earthquake. Finally, we review the rough prediction of the great earthquake and discuss some problems related to the prediction of great earthquakes.  相似文献   

15.
在地震学参量年度异常的背景^(3),阐述了1995 ̄1996年云南地区发生的孟连、武定、丽江三次强震前的地震活动短期异常,包括地震平静、小震群、窗口地震、调制地震、地震波参数以及4级左右地震向震中迁移等。结果表明,这些异常特征表现突出,其演化进程显示了强震孕育的阶段性。  相似文献   

16.
研究2001年昆仑山口西地震和2008年汶川地震前的中源地震活动特征,与唐山地震前的特征进行比较,发现:3次大地震前曾发生6或7次h≥60 km的中源地震,且"大震前中源地震活跃的时间跨度T"约5年或5年多。这是大震前中源地震活动最主要的两个特征,包含了孕育大地震的一些重要信息。其他特征还有:中源地震的活动—平静交替、临近大地震前的地震平静、呈条带分布和(或)地震空区等特征,这与大震前壳内地震活动性的一些特征类似。  相似文献   

17.
黑龙江省十年地震危险性评估   总被引:1,自引:0,他引:1  
郭德明  孙文斌 《地震》1993,(6):61-64
本文研究了东北深震区深震活动的时序特征,发现深源地震活动具有较清晰的平静一活动轮回,并且在深震活动之后,黑龙江省的浅源地震活动相对增强。根据历史地震活动特征与近期小分布特点。作者给出了未来十年时间内,浅源中强震发生的二条危险区段。  相似文献   

18.
自1975年以来,海城附近发生具有一定规模和强度的震群(ML≥4.0;震次≥100次)有:1975年2月4日海城7.3级、1999年11月29日岫岩5.4级、2008年11月14日海城Ml4.8和2012年2月2日盖州Ml4.8震群,这4个震群发生前地震活动背景怎样,是否存在着某种共同的特点?对这4个震群进行对比研究发现:震前1年该区出现小震群活动,ML≥3.0地震条带、地震活动水平明显增强,连续发生多次ML≥4.0地震,ML≥4.0地震震源机制高度一致,且震中最近台站记录P波初动符号出现明显的一致性等变化,可视为地震异常。及时捕捉中强地震前异常,对于地震活动趋势判断起到至关重要的作用。  相似文献   

19.
2003年4月17日青海省德令哈市西北发生6.6级地震。该地震发生在具有强烈活动特征的大柴旦—宗务隆山断裂带上,震前地震活动表现出明显的大面积ML4级地震平静,而震中附近则同时出现了高频次、高GL值异常以及ML3级地震平静—活跃、ML4级地震平静等异常现象。对省内及甘肃省前兆观测资料进行追踪分析,认为震前有4项前兆测项呈现出中期和短期异常特征。  相似文献   

20.
2004年9月17日阳江4.9级地震概述   总被引:2,自引:1,他引:1  
2004年9月17日广东阳江发生了4.9级地震,从地震序列、震中位置及等震线分布判断本次4.9级地震仍属1969年阳江6.4级地震"老"震区的晚期地震活动,与该区已发生的4~5级地震序列活动类似,具有前期余震频度、强度衰减快的特点.宏观调查及震源机制证实平冈断裂是此次4.9级地震的主要控震和发震构造.震前曾出现了一定数量的前兆异常,但地震学异常不显著,震前中小地震活动未出现异常活跃或异常平静.  相似文献   

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