灾害频发和地磁减弱的关系  

Relationship of frequent disasters with geomagnetic weakening

作　　者：杨冬红[1,2] 杨学祥[3] 

机构地区：[1]吉林大学古生物学与地层学研究中心,长春130026 [2]吉林大学东北亚生物演化与环境教育部重点实验室,长春130026 [3]吉林大学地球探测科学与技术学院,长春130026

出　　处：《世界地质》2011年第3期474-480,共7页World Geology

基　　金：中央高校基本科研业务费专项基金;国家自然科学基金项目(49774228)联合资助

摘　　要：近年来全球强震频发,其灾难发生的原因可能是由地磁减弱引起的。研究表明,地磁减弱的原因在于两极冰盖融化导致地壳和地幔转动惯量增大及自转减慢,由此引发核幔差异旋转在数值和方向上的改变。在磁场减弱和磁极反向过程中,太阳辐射的增强和核幔热能的释放与灾害有一一对应关系。这一研究结论与美国学者最近发现的"浅核磁场"相一致。全球变暖与地磁减弱的相关性表明,气候变暖不仅会导致海平面上升,而且会导致频繁的地震、火山活动。Recently, global earthquakes occur frequently, which may be caused by geomagnetic weakening. The study showed that the reasons of geomagnetic weakening were the increase of crust-mantle rotatioanal inertia and the reduction of earth rotation led by polar ices melting, which caused the change of core-mantle differential rotation on numerical value and direction. During the process of geomagnetic weakening and polarity reversal, the increase of solar radiation and the release of core-mantle thermal energy were in one-to-one correspondence with disasters. This conclusion was consistent to the ＂shallow core field＂ discovered by American scholars. The correlation of global warming to geomagnetic weakening showed that climate warming not only caused sea level rise, but also led to frequent earthquakes and volcanic activities.

关 键 词：地磁场 冰期 潮汐 全球变暖 地球自转 

分 类 号：P318[天文地球—固体地球物理学] P631.3[天文地球—地球物理学]