搜索结果: 31-45 共查到“国际动态 固体地球物理学”相关记录371条 . 查询时间(2.251 秒)
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2020年6月12日,《科学》(Science)杂志刊发文章《序列地震图:核幔边界区域散射的全景图》称,马里兰大学研究人员使用了一种称为序列器(Sequencer)的机器学习算法,分析了数千地震波沿着核幔边界的地震回波(echoes)特征,获得了整个太平洋区域地震波回波的全景视图,并且发现地球核幔边界存在比以前已知更广泛的异质结构,即存在异常密集的热岩区域。这些成果对于未来地球深部探测、板块构造运...
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Geochemists solve mystery of Earth's vanishing crust(图)
Geochemists solve mystery Earth vanishing crust
2020/7/10
Earth's crust is the solid, outermost layer of our planet. Much of what happens below that layer remains a mystery, including the fate of sections of crust that vanish back into the Earth.Now, a team ...
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Taking a landslide's temperature to avert catastrophe(图)
Taking landslide temperature avert catastrophe
2020/7/3
Engineers at Duke University have developed a comprehensive new model of deep-seated landslides, and demonstrated that it can accurately recreate the dynamics of historic and current landsli...
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Scientists find much earlier birth date for Earth's tectonic plates(图)
Scientists earlier birth date Earth tectonic plates
2020/6/5
Geophysicists funded by the National Science Foundation have reported that Earth's ever-shifting, underground network of tectonic plates was firmly in place more than 4 billion years ago -- at least a...
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A steaming cauldron followed the dinosaurs' demise(图)
steaming cauldron followed dinosaurs' demise
2020/6/5
A new study reveals that the Chicxulub impact crater may have harbored a vast and long-lived hydrothermal system following the catastrophic impact event linked to the extinction of the dinosaurs 66 mi...
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2020年4月24日,加拿大麦吉尔大学领导的一项新研究发现,地下的构造板块显示出不同程度的粗糙度,这有助于解释为什么某些地震比其他地震更强烈。相关研究成果近期发表于《自然-地球科学》(Nature Geoscience)。
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Tectonic plates started shifting earlier than previously thought(图)
Tectonic plates started shifting previously thought
2020/5/9
An enduring question in geology is when Earth's tectonic plates began pushing and pulling in a process that helped the planet evolve and shaped its continents into those that exist today. Some researc...
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2018年12月22日晚9:30-10:00,海啸袭击了印尼苏达海峡沿岸城市,致使437人死亡,几千人受灾。当地民众没有感觉到明显地震动,印尼地震台网中心(BMKG)仅定位到一个3级左右的小地震,因而未提前发布有效的海啸预警。中山大学叶玲玲教授等(Ye et al.,2020)利用印尼的宽频带地震波数据,发现此次海啸由滑坡引发,与2018年活跃的Anak Krakatau火山活动有关,相关成果发表...
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NG:火星地震活动性(图)
NG 火星 地震活动性
2020/4/29
2018年11月26日,美国洞察号(Insight)火星探测器登陆火星赤道附近的埃律西昂平原(Elysium Planitia)。2019年2月底,火星地震仪(简称火震仪)布设完成,其研究任务包括探测火星内部的地震活动性、约束火星内部结构、物质成分及动力学过程。近期,Giardini et al.(2020)在Nature上发表了《The seismicity of Mars》一文,首次提供火星地...
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柯伊伯带小行星被认为是原地形成的星子,在后期巨行星轨道迁移事件中未受到严重扰动,因此它们记录了星云形成星子的详细过程,是揭示太阳系起源和早期演化这一基本科学问题的“钥匙”(Nesvorny, 2018)。2006年发射的 “新视野号”(New Horizons)于2019年1月飞至柯伊伯带,对编号为486958的小行星(Ultima Thule, 2014 MU69)开展了近距离探测,首次获得了柯...
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火星探测器在火星表面观测到了大量河流、湖泊和海洋留下的地质痕迹(图1)。这说明曾经的火星和地球一样,有大量的地表水和温湿的气候(Carr et al, 1987; Lasue et al., 2013)。但现在的火星气候寒冷干燥,失去了所有的地表液态水,只有两极干冰极盖区存在少部分冰和大气中存在少量水蒸气。火星曾经的湖泊海洋为什么会消失,那么多地表水去了哪里,地球会不会有一天也像火星一样失去所有的...
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By incorporating the architecture of city drainage systems and readings from flood gauges into a comprehensive statistical framework, researchers at Texas A&M University can now accurately p...
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Scientists determine early Earth was a ‘water world’ by studying exposed ocean crust(图)
Scientists early Earth water world’ exposed ocean crust
2020/3/13
The Earth of 3.2 billion years ago was a "water world" of submerged continents, geologists say, after analyzing oxygen isotope data from ancient ocean crust now exposed on land in Australia. The findi...
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Turbulence is everywhere -- it rattles our airplanes and makes tiny whirlpools in our bathtubs -- but it's one of the least understood phenomena in physics.Turbulence occurs when an ordered fluid flow...