Localized temporal change of the earth's inner core boundary
Localized temporal change of the earth's inner core boundary
复制标题
DOI：
10.1126/science.1131692
复制
发表时间：
2006-11-10
期刊：
影响因子：
56.9
通讯作者：
Wen, Lianxing
中科院分区：
文献类型：
--
作者：
Wen, Lianxing
俄罗斯和吉尔吉斯斯坦的三个地震站记录到的双重地震（1993年12月1日和2003年9月6日在南桑威奇群岛发生的两次地震）的压缩波，并被地球内核边界反射，至少提前了39到70毫秒。2003年的事件比1993年的事件早。这种变化表明，在这两次事件之间，地球的内核半径在非洲中部以下局部扩大了0.98至1.75公里。内芯半径的变化可以通过内芯的差动运动来解释，假设不规则性存在于内芯边界处并固定到内芯，或者通过内芯的快速增长来解释。
Compressional waves of an earthquake doublet ( two events occurring in the South Sandwich Islands on 1 December 1993 and 6 September 2003), recorded at three seismic stations in Russia and Kyrgyzstan and reflected off Earth's inner core boundary, arrived at least from 39 to 70 milliseconds earlier in the 2003 event than in the 1993 event. Such changes indicate that Earth's inner core radius enlarged locally beneath middle Africa by 0.98 to 1.75 kilometers between the times of these two events. Changes of the inner core radius may be explained by either a differential motion of the inner core, assuming that irregularities are present at the inner core boundary and fixed to the inner core, or a rapid growth of the inner core by this amount.