The Somalia plate and the East African Rift System: present-day kinematics
The Somalia plate and the East African Rift System: present-day kinematics
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索马里板块和东非裂谷系统：当今的运动学
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
J. Gaulier
中科院分区：
文献类型：
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作者：
F. Jestin;P. Huchon;J. Gaulier
摘要 使用基于蒙特卡罗技术和最小绝对值失配准则的新反演方法重新评估索马里板块相对于努比亚（非洲）、阿拉伯和南极洲板块的运动。使用 NUVEL 1 数据集的子集，以及黎凡特断层和红海沿线的附加数据。结果证实，阿拉伯对非洲的动议与对索马里的动议显着不同。进一步表明，西南印度洋中脊沿线的数据与非洲和索马里之间的相对运动极点相一致，该极位于印度洋中脊与东非裂谷之间假设的弥漫三重连接点附近。由此产生的非洲-索马里运动与东非裂谷系统沿线的地质结构和地震数据兼容。假设一个单独的索马里板块解决了阿法尔三重交汇点周围和东非裂谷沿线的运动学和地质问题。
SUMMARY The motion of the Somalia plate relative to the Nubia (Africa), Arabia and Antarctica platcs is re-evaluated using a new inversion method based on a Monte Carlo technique and a least absolute value misfit criterion. A subset of the NUVEL 1 data set, with additional data along the Levant Fault and in the Red Sea is used. The results confirm that the motion of Arabia with respect to Africa is significantly different from the motion relative to Somalia. It is further shown that the data along the SW Indian Ridge are compatible with a pole of relative motion between Africa and Somalia located close to the hypothetical diffuse triple junction between the ridge and thc East African Rift. The resulting Africa-Somalia motion is then compatible with the geological structures and seismological data along the East African Rift system. Assuming a separate Somalia plate thus solves kinematic and geological problems around the Afar triple junction and along the East African Rift.