共查询到20条相似文献，搜索用时 46 毫秒
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《国际地震动态》创刊于 2 0世纪 70年代 ,其时中国还没有开始摆脱封闭或准封闭的状态。在这样的情况下 ,《国际地震动态》作为反映地震科学发展和防震减灾事业的国际动态的刊物 ,在某种程度上发挥了地震研究领域的《参考消息》的作用。这也正是《国际地震动态》长期以来深受专业人员、管理人员和对地震科技发展感兴趣的读者的喜爱 ,在防震减灾事业中颇有影响 ,并引起一些国外的专家和研究机构关注的主要原因。改革开放初期 ,《国际地震动态》根据当时国际上防震减灾事业的发展 ,及时地进行了地震社会学和地震对策方面的报道和讨论。在当时… 相似文献
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中国地震学会第十二次学术大会,于2008年12月1日至4日在北京召开.大会收到论文220篇,经评审,从中遴选了170多篇汇编出版了<国际地震动态:中国地震学会第十二次学术大会论文摘要专集>.来自全国各地不同系统的单位的260多名代表参加了这次大会. 相似文献
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2008年12月3日,在中国地震学会第十二次学术大会召开期间,<国际地震动态>杂志在中国地震局地球物理研究所召开编委咨询会,就杂志过去几年的状况和未来发展的问题听取编委的意见,并由编辑部的同志向到会的编委介绍编辑部的工作情况. 相似文献
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本文以中国地震局分析预报中心在APnet网上发布的地震目录为基础,对照<中国地震年鉴>、<中国震例>和哈佛大学的CMT目录,逐一筛选编制了一个包括震型(包括孤立型、主余型、多震型)、震级(包括面波震级和体波震级)、主压(张)应力P(T)轴方向、主破裂面等参数在内的震源参数目录.震级(面波震级)和地震类型采用<中国震例>或<中国地震年鉴>中的结果,体波震级、主压(张)应力P(T)轴方向采用CMT目录结果,大多数主破裂面参数是根据<中国震例>或<中国地震年鉴>中发表的主破裂面方向,选用CMT目录中相应的节面参数,少数地震的主破裂面参数是根据<中国地震年鉴>中发表的烈度分布的长轴方向,在CMT目录中选用相应的一个节面参数.在筛选过程中,对震群型地震只选用其中一个地震列入本研究的震源参数目录中,这样一共筛选出了101次地震.根据地震主破裂面的滑动角λ把发震断层分为走滑断层、逆断层和正断层三种情况,相应地把这三种性质断层上发生的地震分别称为走滑断层地震、正断层地震和逆断层地震. 相似文献
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湖北浠水核电初可研阶段地震地质专题中涉及1634年3月30日罗田51/2级地震,我国3个主要的地震目录<中国历史强震目录>(1995年),<中国地震目录>(1971年,中央地震工作小组办公室编)和<中国地震目录>(1960年,李善邦)对这个地震记载的震中参数有差异(表1 ,为了工程的需要,我们对这个地震参数重新进行了调查. 相似文献
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这次地震是由个别专家演绎出来的,发震日定为阳嘉三年十一月十一日(134年12月13日),地点定在陇西汉阳(今甘肃天水),震级7级. 1 "阳嘉三年地震"史无记载"阳嘉三年地震"出于清代经学家惠栋(1697-1758年)<后汉书补注.卷二十一>:"<鲁国先贤传>云,孔氏仲渊为司空,阳嘉三年以地震免."<鲁国先贤传>是晋大司农白褒撰,原作已佚. 相似文献
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为了便于读者了解中国和邻区以及全球的地震分布图象, 作者利用中国地震台网中心的地震资料, 绘制出中国及邻区地震震中分布图和世界地震震中分布图. 刊登在<地震学报>每年第6期上. 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