...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Crack-induced seismic anisotropy in the oceanic crust across the East Pacific Rise (9°30'N)
【24h】

Crack-induced seismic anisotropy in the oceanic crust across the East Pacific Rise (9°30'N)

机译：东太平洋上升（9°30'N）大洋地壳中裂纹引起的地震各向异性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The seismic anisotropy of the shallow oceanic crust across the East Pacific Rise (9°30'N) is studied with P-wave refraction data collected during a controlled-source, three-dimensional tomography experiment. The anisotropy is indicated by a cos(2θ) pattern of travel time residuals, where θ is the receiver to shot azimuth. The travel time data are best fit by a model containing 4% anisotropy from 500 m to 1 km depth below the sea floor, 2% from 1 to 2 km, and 0% below 2 km depth. The upper 500 m of crust is not independently constrained by the data since ray paths at these depths are oriented near vertically. The fast direction of P-wave propagation is aligned along a trend oriented 6 ± 10° counterclockwise from the rise axis. The results are consistent with the presence of vertically aligned cracks that form on or very near the rise axis, are oriented nearly parallel to the rise trend, penetrate to less than 2 km depth, and provide <10% of the total pore space in the shallow crust. In comparison with similar studies across slow- and intermediate-spreading ridges, there is no apparent spreading-rate dependence of the magnitude of anisotropy.
机译：利用在受控源三维层析成像实验中收集的P波折射数据，研究了东太平洋上升带（9°30'N）上浅海地壳的地震各向异性。各向异性由传播时间残差的cos（2θ）模式表示，其中θ是发射方位角的接收器。包含在海床以下500 m至1 km深度中4％的各向异性，在1 km至2 km处2％的各向异性以及在2 km以下的0％的各向异性的模型最适合旅行时间数据。地壳上部500 m不受数据的独立约束，因为这些深度处的光线路径接近垂直方向。 P波传播的快速方向沿与上升轴逆时针方向6±10°的趋势对齐。结果与在上升轴上或非常接近上升轴上形成垂直排列的裂纹，与上升趋势几乎平行，穿透到小于2 km的深度并提供小于10％的总孔隙空间的存在相一致。浅壳。与跨慢扩展脊和中扩展脊的类似研究相比，各向异性的幅度没有明显的扩展速率依赖性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号