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1.
应新疆维吾尔自治区地震局邀请,哈萨克斯坦共和国科教部地震研究所副所长乌兹别克夫、预报中心主任库尔斯柯耶夫院士、抗震中心主任阿巴卡诺夫、研究员别拉斯留采夫、卡扎科夫五人组成的哈地震研究所地震专家组于2 0 0 4年4月1 9—2 4日对新疆维吾尔自治区地震局进行了为期一周的工作访问。访问期间,双方专家共同分析了2 0 0 4年哈萨克斯坦和中国新疆地区地震形势,共同讨论了2 0 0 3年9月2 7日发生的阿勒泰地震、2 0 0 3年1 2月1日发生的中哈边界地震以及有关合作开展天山深部构造研究及城市活断层研究等问题。之后,双方专家召开学术报告会,… 相似文献
2.
新疆维吾尔自治区地震局首次派出有地方地震局官员参加的地震观测与台站管理专家考察团于１９９８年４月６日至４月１３日对哈萨克斯坦地震研究所进行了为期一周的访问、考察。双方就共同关心的问题进行了座谈交流。哈方地震研究所所长库尔什科耶夫介绍了哈萨克斯坦现有的５２个地震台和９种主要观测手段（测震、地磁、地电、电磁波、形变、水动态、水化学、大气压、动物观测）,以及地震研究所所承担的主要任务和一些其他情况;新疆地震局考察团团长寇大兵重点介绍了我国防震减灾立法工作的情况,并向哈方赠送了《中华人民共和国防震减灾法… 相似文献
3.
应哈萨克斯坦共和国科教部地震研究所要求 ,2 0 0 3年下半年阿拉木图地区地震形势研讨会于 7月 30日在新疆维吾尔自治区地震局召开。新疆维吾尔自治区地震局张云峰局长、王海涛副局长 ,哈萨克斯坦科教部地震研究所所长 E.努西波夫及中哈专家 1 0余人与会。会上哈方专家介绍了用 RTL方法预测阿拉木图地区下半年可能发生 6级地震的过程。新疆地震局委派分析预报中心 6位专家对这一震情进行协助判定。新疆专家们运用强震间隔时间累计概率和投影寻踪自回归预测模型 ,天山地震带 6级地震活动周期和迁移规律 ,5— 7级地震准前震 ,地震活动增强、… 相似文献
4.
20 0 2年 6月 6日新疆地震局组织有关专家对参加昆仑山口西 8.1级大地震科学考察西线分队的考察资料进行了验收 ,并给予了较好的评价。2 0 0 1年 1 1月 1 4日 ,在新疆、青海、西藏三省交界的昆仑山口西布喀达板峰北侧 ,发生了50年一遇的 8.1级地震。震后新疆地震局根据中国地震 相似文献
5.
根据中国新疆维吾尔自治区地震局与哈萨克斯坦地震研究所地震科技协议,双方商定于1992年9月24日—30日在哈萨克斯坦首府阿拉木图,联合召开第一届天山地震预报国际讨论会。 这次会议将着重交流有关天山地区的地震预报、地球物理、地震地质、工程地震、地下水化学和水动态、地震形变测量以及地震观测技术等方面的研究成果,并将出版会议论文集。另外会议还将组织对阿拉木图等几个大震的考察。 相似文献
6.
正2013年12月16日,中国科学院院士、原中国地震局副局长陈颙同志应邀到山东省防震减灾科技园区,并在山东省地震局做了题为《加强减灾能力建设的建议》的专题报告。16日上午,陈颙院士先后视察了山东省地震监测中心台GPS观测站、山东地震观测专用山洞、综合观测室以及新建成的山东省地震台网中心、应急指挥中心,听取了山东省地震局晁洪太局长关于防震减灾科技园区的规划、建设、运行等情况汇报。陈颙院士对山东省防震减灾科技园的规划建设给予了高度 相似文献
7.
20 0 3年 1月 14— 2 1日 ,俄罗斯科学院高温研究所科学站谢洛契可夫所长、祖博维奇教授一行 2人应邀对新疆地震局进行了为期 8天的工作访问。访问期间外宾考察了水磨沟地震台、乌鲁木齐形变站、库尔勒地震台、吐鲁番地震局 ,中外专家就地震地质、地球动力学、地球物理、台站观测等相关领域进行了学术交流 ,并根据双边协议进行了 GPS观测数据的交换。通过本次访问 ,双方科学工作者增进了相互了解 ,并愿意在更多领域以多种形式进行交流合作 ,以求取长补短、共同发展 ,努力促进两国地科技的进步俄罗斯科学院高温研究所专家访问新疆地震局$新… 相似文献
8.
应新疆维吾尔自治区地震局的邀请 哈萨克斯坦共和国地震研究所专家潘林别洛斯留得采夫库尔什格娃于年月日至月日来我局进行了工作访问。访问期间双方专家就综合预报方法进行了探讨 研究员朱令人研究员王海涛高级研究员别洛斯留得采夫还分别做了《地震复杂性前兆及高维统计预测》《加卸载响应比理论及其应用》《地震短期预报》的学术报告。哈方专家还考察了乌鲁木齐基准台红山地震台和乌什城遥测台。 《内陆地震》2001,15(2):147
应新疆维吾尔自治区地震局的邀请，哈萨克斯坦共和国地震研究所专家潘林、别洛斯留得采夫、库尔什格娃于2001年3月12日至3月17日来我局进行了工作访问。访问期间双方专家就综合预报方法进行了探讨，研究员朱令人、研究员王海涛、高级研究员别洛斯留得采夫还分别做了《地震复杂性前兆及高维统计预测》、《加卸载响应比理论及其应用》、《地震短期预报》的学术报告。哈方专家还考察了乌鲁木齐基准台、红山地震台和乌什城遥测台。 相似文献
9.
《地震地磁观测与研究》2015,(6)
<正>2015年10月12日—14日,中国地震学会地震观测技术专业委员会(下简称地震观测技术专业委员会)2015年度学术研讨会在西昌市举行。本次会议由地震观测技术专业委员会主办,四川省地震局承办,凉山州地震局协办。凉山州人民政府副州长肖春、四川省地震局副局长吕志勇、地震观测技术专业委员会主任薛兵等出席了开幕式。来自中国各省、自治区、直辖市地震局及高等院校、科研院所、部队等相关部门的60余名专家 相似文献
10.
20 0 4年 10月 2 7日 17时 2 3分 ,在温泉西北中哈边境地区 (北纬 4 5 .2 0°,东经 80 .2 0°)发生了5 .1级地震。温泉县及博州地区有震感。地震发生后 ,新疆维吾尔自治区地震局及时启动地震应急预案 ,立即向新疆维吾尔自治区党委、政府及中国地震局有关领导通报了情况。18点 10分用电话通知离灾区较近的博州地震局派工作人员先赴震区 ,了解灾情。而由新疆地震局应急管理部门和地震灾评专家组成的现场工作队 ,于 2 1点 30分连夜出发赶赴震区 ,开展地震应急工作。新疆维吾尔自治区地震局及时启动地震应急预案$新疆维吾尔自治区地震局@魏若平… 相似文献
11.
Barry Saltzman 《Pure and Applied Geophysics》1964,57(1):153-160
Summary A possible formal approach to a closed steady-state theory of the mean axially-symmetric variables is outlined. The approach involves alternating iterative solutions of the energy and momentum equations. In these equations the effects of transient eddy phenomena of all frequencies are assumed to be parameterized in terms of the mean symmetric variables. 相似文献
12.
Peaks in the Cascade Range in northern Washington State are on average ～800 m higher than in southern Washington. The influences of differential valley excavation and variations in hillslope length and average slope on these altitudinal trends were tested using a 3‐dimensional model for isostatic rock uplift and calculations of hillslope length and slope respectively. The magnitude of isostatic peak uplift calculated by the model is highly dependent on the flexural rigidity (D) and the related effective elastic thickness (Te) of the crust of this region. Crustal rigidity was constrained using published estimates and by estimating the depth of the seismogenic zone in the area (D > 1 × 1023 Nm and Te > 24 km). With these constraints, isostatic compensation due to differential erosion added < 700 m and 300 m, or < 25% overall, of height to peaks in the northern and southern Cascades, respectively. Deeper valley incision in the northern Cascades accounts for < 300 m of the 800 m difference in peak altitudes between north and south. Similarly, variation in valley spacing and slope account for < 350 m of the difference in mean altitude between northern and southern regions. Hence, at least several hundred m difference in altitude between the northern and southern regions of the Cascades in Washington must be due to tectonic, geologic, or geophysical factors rather than surficial and geomorphic effects like isostatic response to valley incision and hillslope geometry. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
13.
Petrology of the dyke rocks of the western portions of Rajpipla hills,Broach district,Gujarat, India
P. Krishnamurthy 《Bulletin of Volcanology》1971,35(4):930-946
The paper embodies the field, petrographic and petrochemical studies of the dykes occuring within the Deccan basalts, in the Western portions of Rajpipla hills. Major and minor dykes with different trends occur in the area varying in thickness from 2′ to 75′ and traceable lengthwise from few to several miles. The density of the dyke distribution is two per mile. The composition of the minor dykes ranges from teschenite to trachyte with dominant basaltic types and they seem to be coeval with the flows of the area. The major dolerite dykes are found to be post-lava. Both alkali-olivine basalt and tholeiitic types occur. The former phase preceeds the latter and includes the minor alkaline dykes. A differentiation trend based on new chemical analyses is proposed. 相似文献
14.
Tetsuzo Seno Kunihiko Shimazaki Paul Somerville Ken Sudo Takao Eguchi 《Physics of the Earth and Planetary Interiors》1980,23(1):39-61
The faulting mechanism and multiple rupture process of the M = 7.4 Miyagi-Oki earthquake are studied using surface and body wave data from local and worldwide stations. The main results are as follows. (1) P-wave first motion data and radiation patterns of long-period surface waves indicate a predominantly thrust mechanism with strike N10° E, dip 20°W, and slip angle 76°. The seismic moment is 3.1 × 1027 dyne-cm. (2) Farfield SH waveforms and local seismograms suggest that the rupture occurred in two stages, being concordant with the two zones of aftershock activity revealed by the microearthquake network of Tohoku University. The upper and lower zones, located along the westward-dipping plate interface, are separated by a gap at a depth of 35 km and have dimensions of 37 × 34 and 24 × 34 km2, respectively. Rupture initiated at the southern end of the upper aftershock zone and propagated at N20°W subparallel to the trench axis. About 11 s later, the second shock, which was located 30 km landward (westward) of the first, initiated at the upper corner of the lower aftershock zone and propagated down-dip N80°W. Using Haskell modelling for this rupture process, synthetic seismograms were computed for teleseismic SH waves and nearfield body waves. Other parameters determined are: seismic moment , for the first event; , for the second event; and time separation between the two shocks ΔT = 11 s. The above two-segment model does not explain well the sharp onsets of the body waves at near-source stations. An initial break of a small subsegment on the upper zone, which propagated down-dip, was hypothesized to explain the observed near-source seismograms. (3) The multiple rupture of the event and the absence of aftershocks between the two fault zones suggests that the frictional and/or sliding characteristics along the plate interface are not uniform. The rupture of the first event was arrested, presumably by a region of high fracture strength between the two zones. The fracture energy of the barrier was estimated to be 1010 erg cm?2. (4) The possible occurrence of a large earthquake has been noted for the region adjacent to and seaward of the area that ruptured during the 1978 event. The 1978 event does not appear to reduce the likelihood of occurrence of this expected earthquake. 相似文献
15.
William G. Melson James F. Allan Deborah Reid Jerez Joseph Nelen Marta Lucia Calvache Stanley N. Williams John Fournelle Mike Perfit 《Journal of Volcanology and Geothermal Research》1990,41(1-4)
The petrology of the highly phyric two-pyroxene andesitic to dacitic pyroclastic rocks of the November 13, 1985 eruption of Nevado del Ruiz, Colombia, reveals evidence of: (1) increasingly fractionated bulk compositions with time; (2) tapping of a small magma chamber marginally zoned in regard to H2O contents (1 to 4%), temperature (960–1090°C), and amount of residual melt (35 to 65%); (3) partial melting and assimilation of degassed zones in the hotter less dense interior of the magma chamber; (4) probable heating, thermal disruption and mineralogic and compositional contamination of the magma body by basaltic magma “underplating”; and (5) crustal contamination of the magmas during ascent and within the magma chamber. Near-crater fall-back or “spill-over” emitted in the middle of the eruptive sequence produced a small pyroclastic flow that became welded in its central and basal portions because of ponding and thus heat conservation on the flat glaciated summit near the Arenas crater. The heterogeneity of Ruiz magmas may be related to the comparatively small volume (0.03 km3) of the eruption, nearly ten times less than the 0.2 km3 of the Plinian phase of Mount St. Helens, and probable steep thermal and PH2O gradients of a small source magma chamber, estimated at 300 m long and 100 m wide for an assumed ellipsoidal shape. 相似文献
16.
Gary D. Rosenberg 《Surveys in Geophysics》1985,7(2):185-199
Growth patterns preserved in the accretionary skeletons of fossils provide the only known method of directly measuring the rate of the Earth's rotation in the distant past. From seasonal and tidal growth patterns of fossils, one can determine the number of days per year and per month, respectively, in the distant past. Together, these values can be used to distinguish the effects of moment of inertia changes on the length of day from those of tidal friction. When the Metazoan accretionary skeleton originated in the Late Precambrian-Cambrian, the length of day determined from fossils was approximately 19 hr. This value requires that density differentiation of the Earth was essentially complete well the end of the Precambrian. The growing length of day, as well as prior differentiation of oxygenated outer layers (atmosphere, hydrosphere, and crust) from the Earth's dense layers within, were prerequisites for the origin of the Metazoa. Circadia (=approximatelly 24 hr) rhythms in living Metazoa do not readily adapt to environemtal cycles less than about 19hr. Prokaryotes generally lack circadian rhythms because their generation times are less than a day; prokaryotes were well-adapted to Precambrian days less than 19 hr duration, as well as to oxygen-poor environments. As the length of day increased to 19 hr or more during the Late Precambrian, eukaryotes with life spans substantially longer than a day (and consequently with an ability to postpone energyusage beyond a day) evolved. During the Phanerozoic, moment of inertia changes were relatively small, so that lunar tidal friction became the most important cause of changing length of day. However, some researchers believe that even the former may have left an imprint on fossil growth patterns. This conclusion is difficult to confirm, given the uncertainties of growth pattern analyses. But facies-by-facies comparisons of growth patterns can help reduce this uncertainty: presumed tidal growth patterns should change systematically with depth of habitat, for example. Preliminary analyses for Late Ordovician brachiopods from Indiana suggest that this approach will be productive, and may help evaluate the suggestion that the Late Ordovician-Silurian was a time of unusual evolution of the Earth's moment of inertia during the Phanerozoic. 相似文献
17.
G. Jayachandran M.M. Abdul RazakA.G.V. Prasad E. Unnikrishnan 《Physics of the Earth and Planetary Interiors》2003,138(2):131-145
The devastating earthquake on 26 January 2001 at Bhuj, India, resulted in large-scale death and destruction of properties of several million US dollars. The moment magnitude of the earthquake was 7.7 and its maximum focal intensity exceeded X in MM scale. The rate of aftershocks of this earthquake, recorded at Gauribidanur seismic array station (GBA), shows a monotonic decay with time superposed with oscillations. For the Indian continent the Lg phase is a prominent arrival at regional distances. The estimate of Lg amplitude is obtained by optimally fitting the Lg wave train to a exponential decay curve. The logarithm of these amplitudes and logarithm of root mean square (rms) value of actual amplitudes of the Lg are calibrated with USGS mb to create a local mbLg magnitude scale. The energy released from these aftershocks is calculated from the rms value of Lg phase. The plot of cumulative energy release with time follows the power law of the form tp, superposed with oscillations. The exponent of the power law, p, is estimated both by a time-window scanning method and by an interpolation method. The value of p is 0.434 for time-window scanning method and 0.432 for the interpolation method. The predominant periods found in the oscillatory part of the cumulative energy, obtained by differencing the observed from the power law fit, are 10.6, 7.9, 5.4, 4.6 and 3.5 h for time-window scanning method. The corresponding periods for interpolation method are 13.4, 11.5, 7.4, 4.2, 3.5, 2.6 and 2.4 h. 相似文献
18.
A new model is proposed for the structure of the Kaapvaal craton lithosphere. Based on chemical thermodynamics methods, profiles of the chemical composition, temperature, density, and S wave velocities are constructed for depths of 100–300 km. A solid-state zone of lower velocities is discovered on the S velocity profile in the depth interval 150–260 km. The temperature profiles are obtained from absolute values of P and S velocities, taking into account phase transformations, anharmonicity, and anelastic effects. The examination of the sensitivity of seismic models to the chemical composition showed that relatively small variations in the composition of South African xenoliths result in lateral temperature variations of ～200°C. Inversion of some seismic profiles (including IASP91) with a fixed bulk composition of garnet peridotites (the primitive mantle material) leads to a temperature inversion at depths of 200–250 km, which is physically meaningless. It is supposed that the temperature inversion can be removed by gradual fertilization of the mantle with depth. In this case, the craton lithosphere should be stratified in chemical composition. The depleted lithosphere composed by garnet peridotites exists to depths of 175–200 km. The lithospheric material at depths of 200–250 km is enriched in basaltoid components (FeO, Al2O3, and CaO) as compared with the material of garnet peridotites but is depleted in the same components as compared with the fertile substance of the underlying primitive mantle. The material composing the craton root at a depth of ～275 km does not differ in its physical and chemical characteristics from the composition of the normal mantle, and this allows one to estimate the thickness of the lithosphere at 275 km. The results of this work are compared with data of seismology, thermal investigations, and thermobarometry. 相似文献
19.
P. K. Mukherjee 《Bulletin of Volcanology》1971,35(4):887-906
Nine basaltic lava-flows, which vary in thickness between 60 feet and 300 feet, were established in the NW Rajmahals. The flows were, at places, laid down one above the other and, at others, were found to contain intervening intertrappean horizons. All the flows are essentially of basaltic composition and are made up of labradoritie plagioclase, pigeonitic and augitic pyroxene, opaque ore, primary glass and secondary minerals (palagonite, secondary silica, calcite and zeolite). The phenocrystic plagioclase ranges in composition between An72 and An62, while the constituents of the groundmass range between An50 and An17. The microphenocrysts of pyroxene are mainly augitic and occasionally pigeonitic while the constituents of the groundmass are essentially pigeonitic. The opaque minerals are magnetite and ilmenite. Petrographically, the lava-flows are more or less similar to one another. The first three flows are, however, more remarkably porphyritic and a little coarser in grain size than the six overlying flows. The eighth flow is devoid of palagonite. Calcite occurs only in certain portions of the second flow. There is a gradual increase in the percentage of primary glass from the first to the ninth flow with a corresponding fall in the total percentage of plagioclase and pyroxene. Statistical analysis of the grain size variation in the plagioclases was carried out and the results were found to be directly related to the prevailing rates of cooling in the different flows and also in the different horizons of the same flow. Modal analysis of the nine flows (in all, 98 samples) was carried out and this brought out some interesting results. Samples from three of the flows were analysed chemically and the corresponding norms were calculated. The order of crystallisation of the primary constituents was established from petrographic and petrological studies. The basaltic magma, which gave rise to the lava-flows of this region, does not appear to have undergone any significant differentiation during the course of its cooling and consolidation. The only discernible effect of crystallisati on differentiation was an enrichment of silica (and, perhaps, alkalis) in the residual liquids and no noteworthy enrichment of iron appears to have occurred at any stage. 相似文献