论文摘要
The 490 teleseismic events recorded by 154 seismic stations were used to study the upper mantel velocity structure of the middle-southern segment of Tan-Lufaultzone（TLF）. The result show that:（1）. the upper mantle velocity presents strong lateral heterogeneity. The TLF is a velocity gradient zone in the depthof 40-120 km, with a high-velocity anomaly is on its west and a low-velocity anomaly on its east（Fig.1 a）. However, in the depth of 300-400 km, the velocity anomalies on both side of TLF have changed, with a low-velocity anomaly on its westand a high-velocity anomaly on its east（Fig.1 b）. In the depth of 500-600 km, high-velocity anomalies are on both sides of TLF（Fig.1 c）.（2）. the high velocity anomalies H1, H2, and H3 are located beneath the Luxi block（LXB）, the Sulublock（SLB）, and the Yellow sea（YS） respectively. The H1 and H2 are cut off by the TLF and the H2 may be the delaminated lithosphere, while the H3 may represent the subduction of the Paleo Pacific plate（Fig. 2）. The upper mantle velocity anomalies on both sides of TLF may reveal the subduction of the paleo-pacific plate and the backarc retreat movements.
论文目录
文章来源
类型: 国际会议
作者: FAN Xiaoping,ZHAO Qiguang,HE Yicheng,ZHENG Leiming
来源: 第九届世界华人地质科学研讨会 2019-06-01
年度: 2019
分类: 基础科学,工程科技Ⅰ辑
专业: 地质学,地球物理学,矿业工程
单位: Nanjing Tech UniversityEarthquake Administration of Jiangsu Province
分类号: P631.4
DOI: 10.26914/c.cnkihy.2019.028384
页码: 188-189
总页数: 2
文件大小: 183k
下载量: 1