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《CT理论与应用研究》1992,(1)
由中国国家地震局主办的第二届大陆地震国际讨论会(简称IIICCE)将于1992年10月7-10日在北京召开,这次国际学术讨论会得到联合国国际减灾十年委员会、国际地震学与地球内部物理学协会(IASPEI)、中国国家自然科学基金会、中国地震学会和中国灾害防御协会的支持和赞助. 相似文献
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“大陆地震活动和地震预报国际学术讨论会”将于今年9月8日至14日在北京召开。这次会议是1979年4 月在巴黎国际地震讨论会的专家会议上提出的,后又得到了联合国教科文组织、联合国救灾署、国际地震与地球内部物理协会、联合国环境署等国际组织的支持和赞助。联合国教科文组织和中国地震学会共同 相似文献
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2014年8月28～30日,由联合国人道主义事务办公室主办,中国地震局和美国国际开发署支持,中国地震局搜救中心与四川省地震局联合承办,四川省地震学会协办的联合国国际搜索与救援咨询团亚太地震应急演练第二阶段在成都索菲斯锦苑宾馆举行。 相似文献
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由中国地震局主办、中国灾害防御协会和中国地震学会协办、中国地震局地震数据信息中心承办的国际地震仪器与紧急救助设备技术展览会于2003年10月15～17日在北京中国国际科技会展中心举行。据统计, 相似文献
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《山西地震》1982,(4)
“大陆地震活动和地震预报国际学术讨论会”九月八日至十四日在北京举行.这次会议是经国务院批准后,我国代表在一九七九年四月巴黎国际地震讨论会上倡议召开的.并得到联合国教科文组织、联合国救灾署、联合国环保署、国际地震与地球内部物理协会的支持和赞助.参加会议的有来自美国、日本、新西兰、意大利、奥地利、德意志民主共和国、南斯拉夫、泰国、朝鲜民主主义人民共和国、墨西哥、澳大利亚、苏联、英国、法国、希腊、荷兰、捷克斯洛伐克、香港、印度、土耳其、加拿大、巴西、中国等二十三个国家和地区的一百多名代表.他们大多数是目前国际上著名的地震学家,有些是政府、地区(如欧州地区)或科研单位地震预报研究的负责人.联合国教科文组织、联合国救灾署、国际地震与地球内部物理协会等国际组织的代表也参加了会议. 相似文献
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关于办好中国地震学会网站和《国际地震动态》刊物的倡议 总被引：1，自引：0，他引：1
中国地震学会网站：www．ssoc．org．cn已经开通。《国际地震动态》期刊是由中国地震学会和中国地震局地球物理研究所联合主办的科技类期刊。中国地震学会的网站和期刊是中国地震学会与全体会员之间进行学术和信息交流最密切的媒体。中国地震学会作为主办单位,对如何提高网站 相似文献
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阪神·淡路大震灾后 ,日本着手对原有的地震观测体制作彻底改革 ,多项全国性配置地震计的计划同时开始启动。地震引起的地面晃动的程度不尽相同 ,无感微小地震引发的晃动仅有 0 .0 0 1 μm,频率为1 0 Hz;巨大地震引起的地面晃动的幅度高达 2～ 3 m,周期也有几十秒。虽说都称之为地震计 ,但由于地震动的振幅和频率涉及的范围太大 ,所以应针对观测对象选用不同类型的地震计。下面介绍不同类型的观测网。1 强震观测网 ( K- NET)无论大地有多大的晃动都能将其准确记录下来的地震计称之为强震计。它构造坚实 ,信号明确 ,通常设置在地表 ,对了… 相似文献
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Michael O. Garcia Diane Hanano Ashton Flinders Dominique Weis Garrett Ito Mark D. Kurz 《Bulletin of Volcanology》2012,74(6):1445-1463
The size, shape, and magmatic history of the most recently discovered shield volcano in the Hawaiian Islands, Mahukona, have been controversial. Mahukona corresponds to what was thought to be a gap in the paired sequence (Loa and Kea trends) of younger Hawaiian volcanoes (<4?Ma). Here, we present the results of marine expeditions to Mahukona where new bathymetry, sidescan sonar, gravity data, and lava samples were collected to address these controversies. Modeling of bathymetric and gravity data indicate that Mahukona is one of the smallest Hawaiian volcanoes (～6,000?km3) and that its magmatic system was not focused in a long-lived central reservoir like most other Hawaiian volcanoes. This lack of a long-lived magmatic reservoir is reflected by the absence of a central residual gravity high and the random distribution of cones on Mahukona Volcano. Our reconstructed subsidence history for Mahukona suggests it grew to at least ～270?m below sea level but probably did not form an island. New 40Ar–39Ar plateau ages range from 350 to 654?ka providing temporal constraints for Mahukona’s post-shield and shield stages of volcanism, which ended prematurely. Mahukona post-shield lavas have high 3He/4He ratios (16–21?Ra), which have not been observed in post-shield lavas from other Hawaiian volcanoes. Lava compositions range widely at Mahukona, including Pb isotopic values that straddle the boundary between Kea and Loa sequences of volcanoes. The compositional diversity of Mahukona lavas may be related to its relatively small size (less extensive melting) and the absence of a central magma reservoir where magmas would have been homogenized. 相似文献
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In this study, we have checked the location and focal depth of the Yecheng earthquake (m b = 6.0, maximum intensity VII) of February 14, 1980. The result shows that this is an intermediate event with a focal depth of 90 km. The microepicenter is located at 36. 4°N, 76, 9°E, while the macroepicenter is at 37.3°N, 76.9°E, 90 km to the north of the microepicenter. This is the first destructive intermediate event in China which led to a damage as severe as of intensity VII. The focal mechanism of the event is determined to be of thrust type. Combined with the analysis of seismological and geological data in surrounding area, the possible relation between the event and plate movement has been discussed. The result in this paper indicates that in some particular place, the destructive effect of intermediate event should be considered in seismic hazard assessment. 相似文献
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Sun, climate, hunger, and mass migration 总被引：9，自引：1，他引：8
Kenneth J. Hsu 《中国科学D辑(英文版)》1998,41(5):449-472
Paleoclimatic studies indicate four epochs of global cooling during the last 4 000 years, i. e. during the few centuries before
and after 2000 BC, 800 BC, 400 AD, and 1 600 AD; the quasiperiodicity corresponds to cyclic variation of solar activity. Global
temperature changes influenced regional precipitation patterns: Northern Europe was wetter while the middle- and low-latitude
lands were more arid during colder epochs. Both sets of cold climatical conditions were unfavorable for agricultural production.
Historical records show that large demographic movements in history took place because of crop failures and mass starvation,
rather than escaping from war zones. The “wandering” of the Germanic tribes during the first two or three centuries of the
Christian Era is one example. Whereas the accelerated release of carbon dioxide from the burning of fossil fuels is ultimately
to cause global warming, historical evidence indicates, however, that global warming has been on the whole a blessing to mankind.
Global cooling, on the other hand, has curtailed agricultural production and has led to famines and mass migrations of people.
Perhaps the most important task at the present is not so much computer-modelling of greenhouse effect on global climate, but
water-management and agricultural researches to insure food-supply for an everincreasing world population. 相似文献
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In this study, we experimentally established the relationship between physical properties, vitrinite reflectance, and microstructure of coal, Taiyuan Formation, Qinshui Basin, China using representative coal samples collected from three different mines via the rock mechanics testing system (MTS). We analyzed the organic macerals, vitrinite reflectance, and microstructure of 11 coal samples using petrography and scanning electron microscopy (SEM). The experimental results suggest that (1) the elastic parameters can be described by linear equations, (2) both P-and S-wave velocities display anisotropy, (3) the anisotropy negatively correlates with vitrinite reflectance, and (4) the acoustic velocities and Young’s modulus are negatively correlated with the volume of micropores. The derived empirical equations can be used in the forward modeling and seismic inversion of physical properties of coal for improving the coal-bed methane (CBM) reservoir characterization. 相似文献