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在地球表面,热点的分布是不规则的。由于热点数目(40—100)有限,这种不规则性是明显的;然而,其分布似乎也并不完全随机。本文对以下两个已公布热点数据组的统计分布结果进行了比较,其一是42个热点数的最小数据组,其二是117个热点数的较大数据集合。采用了三种方法:(1)相等面积单元的x~2检验;(2)主轴周围的累积分布;和(3)建立密度函数。所有这些方法都表明热点的不规则分布,甚至当考虑统计起伏之后,情况也是一样。作为一级处理,热点集中在半个地球表面,在地表的这一部分,热点分布是均匀的。热点密度的预测,是根据热点数与板块速度相关的经验模型得出。对照预测密度函数和由两个数据组建立的热点密度函数,给出某些相似性;然而,所观测到的热点密度都不能单独用板块速度来解释。
On the surface of the earth, the distribution of hot spots is irregular. This irregularity is evident due to the limited number of hot spots (40-100); however, their distribution does not seem to be completely random. This article compares the statistical distributions of two published hot spot data sets, one for the smallest data set for 42 hot spots and the second for a larger data set for 117 hot spots. Three methods are used: (1) an x ~ 2 test of equal area elements; (2) a cumulative distribution around the major axis; and (3) a density function. All of these methods show an irregular distribution of hot spots, even when considering statistical fluctuations. As a first-level treatment, the hot spots are concentrated on half of the earth’s surface. In this part of the earth’s surface, the hot spots are evenly distributed. The prediction of hot spot density is based on empirical models related to hot spot numbers and plate speeds. Some similarities are given by comparing the predicted density function with the hot spot density function established by the two data sets; however, none of the hot spot density observed can be explained by the plate speed alone.