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971.
福建及台湾海峡地震预警工程架构探索 总被引:2,自引:0,他引:2
福建及台湾海峡是海陆板块碰撞到板内地震活动过渡带 ,东侧毗邻台湾板缘地震带 ,西侧为福建内陆板内地震活动区。这是得天独厚的观测研究大陆边缘地震构造带强震活动及板块动力学的良好地域。当前 ,我国进入全面建设小康社会历史时期 ,为防御地震造成社会灾害 ,实现以人为本 ,防患于未然 ,势必需要建构一个实用化的地震预警工程及其机制。本文即是在对福建及台湾海峡近 30多年以来观测研究的基础上 ,提出应用现代空间技术、数字地震、计算机网络等技术架构地震预警工程与机制的一种设想。 相似文献
972.
973.
桩基沉降量的灰色预测 总被引:2,自引:1,他引:2
利用实测的桩基静载试验数据 ,用灰色系统理论建立桩基沉降量的灰色GM(1,1)预测模型 ,可以模拟桩基静载试验P s曲线的未知部分。研究结果表明 ,建立的GM(1,1)模型可有效预测桩基沉降量 ,对进一步分析桩基的承载性能有理论与实际意义。 相似文献
974.
为详细了解崇明越江通道南港隧道段地层情况 ,设计要求提供长江水域静探资料。简介了我院水域静力触探设备的研制和应用情况 相似文献
975.
陈培善 《地震学报(英文版)》2004,17(2):251-253
Illustration
All the data in this catalog are chosen from the Preliminary Seismological Report of Chinese Seismic Stations (abbreviated to Monthly Report). The catalog includes the events of M≥4.7 in and near China and M≥6 all over the world. The Monthly Report is monthly compiled by the Ninth Section of Institute of Geophysics, China Earthquake Administration (CEA). 相似文献
976.
Estimation of Site Effects in Beijing City 总被引:6,自引:0,他引:6
— For the realistic modeling of the seismic ground motion in lateral heterogeneous anelastic media, the database of 3-D geophysical structures for Beijing City has been built up to model the seismic ground motion in the City, caused by the 1976 Tangshan and the 1998 Zhangbei earthquakes. The hybrid method, which combines the modal summation and the finite-difference algorithms, is used in the simulation. The modeling of the seismic ground motion, for both the Tangshan and the Zhangbei earthquakes, shows that the thick Quaternary sedimentary cover amplifies the peak values and increases the duration of the seismic ground motion in the northwestern part of the City. Therefore the thickness of the Quaternary sediments in Beijing City is the key factor controling the local ground effects. Four zones are defined on the base of the different thickness of the Quaternary sediments. The response spectra for each zone are computed, indicating that peak spectral values as high as 0.1 g are compatible with past seismicity and can be well exceeded if an event similar to the 1697 Sanhe-Pinggu occurs. 相似文献
977.
John F. Bratton John Karl Böhlke Frank T. Manheim David E. Krantz 《Ground water》2004,42(7):1021-1034
978.
979.
Terence Edward Smith Matthew Thirlwall Paul Eric Holm Michael John Harris 《Island Arc》2004,13(1):73-94
Abstract On the island of Mustique, fresh and propylitized olivine–plagioclase–clinopyroxene basalt, plagioclase–clinopyroxene–orthopyroxene and plagioclase–clinopyroxene–amphibole andesite lavas and minor intrusions are interbedded with Oligocene pyroclastic and epiclastic rocks. Chemical data show that two isotopically identical, but chemically different, suites of lava are present: (i) the OPXS (87Sr/86Sr 0.70403–0.70454; 143Nd/144Nd 0.512952–0.512986; δ18Ocpx 5.49 and 5.61), comprising basalts and orthopyroxene‐bearing andesites; and (ii) the AMPHS (87Sr/86Sr 0.70401–0.70457; 143Nd/144Nd 0.512981–0.513037; δ18Ocpx 5.54), made up of basalts and amphibole‐bearing andesites. The OPXS has higher contents of TiO2, P2O5, light rare earth elements, Sm, Pb, Th, U, Zr, Y and Nb, and higher La/Yb ratios than the AMPHS. The isotopic data suggest that both suites formed from melts derived from the same subduction‐modified depleted mantle source as the volcanic rocks of nearby St Vincent and Bequia, and the northern islands of the Lesser Antilles Arc. The immobile trace element contents, and La/Yb ratios, of the OPXS are indicative of ~10% partial melting of the source, whereas those of the AMPHS are indicative of ~25% partial melting. The within‐suite chemical variation of the OPXS is consistent with ~45% fractional crystallization of its intratelluric mineral assemblages, and that of the AMPHS is consistent with the removal of ~65% of its intratelluric assemblages. Experimental evidence suggests that both suites of basalt crystallized at pressures <8 kbar from melts containing 1–2 wt% water. After extensive fractional crystallization, the andesites crystallized at pressures between approximately 5 and 2 kbar. The OPXS magmas appear to have lost more of their water content than the AMPHS magmas. Thus, the OPXS andesites formed from melts with an estimated water content of 2–3 wt%, whereas the AMPHS andesites formed from melts containing at least 4.5 wt% water. 相似文献
980.
John McFarland 《Astronomy& Geophysics》2004,45(1):1.18-1.22
Eric Mervyn Lindsay masterminded the development of Armagh Observatory in the middle of the 20th century, building it into the centre for research and education that it is today. John McFarland recounts Lindsay's story, of how one man's drive and ambition forged international collaborations that presaged today's world of shared research facilities 相似文献