...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Pure and Applied Geophysics >2-D Crustal Velocity Structure Along Hirapur-Mandla Profile in Central India: An Update
【24h】

2-D Crustal Velocity Structure Along Hirapur-Mandla Profile in Central India: An Update

机译：印度中部Hirapur-Mandla剖面的二维地壳速度结构：更新

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 2-D crustal velocity model along the Hirapur-Mandla DSS profile across the Narmada-Son lineament in central India (Murty et al., 1998) has been updated based on the analysis of some short and discontinuous seismic wide-angle reflection phases. Three layers, with seismic velocities of 6.5-6.7, 6.35-6.40 and 6.8 km s~(-1), and upper boundaries located approximately at 8, 17 and 22 km depth respectively, have been identified between the basement (velocity 5.9 km s~(-1)) and the uppermost mantle (velocity 7.8 km s~(-1)). The layer with 6.5-6.7 km s~(-1) velocity is thin and is less than 2-km deep between the Narmada north (at Katangi) and south (at Jabalpur) faults. The upper crust shows a horst feature between these faults, which indicates that the Narmada zone acts as a ridge between two pockets of mafic intrusion in the upper crust. The Moho boundary, at 40-44 km depth and the intra-crustal layers exhibit an upwarp suggesting that the Narmada faults have deep origins, involving deep-seated tectonics. A smaller intrusive thickness between the Narmada faults, as compared to those beyond these faults, suggests that the intrusive activities on the two sides are independent. This further suggests that the two Narmada faults may have been active at different geological times. The seismic model is constrained by 2-D gravity modeling. The gravity highs on either side of the Narmada zone are due to the effect of the high velocity/high density mafic intrusion at upper crustal level.
机译：在分析了一些短时和不连续的地震广角反射相的基础上，更新了印度中部纳尔默达-宋线沿希拉布尔-曼德拉DSS剖面的二维地壳速度模型（Murty等，1998）。在地下室之间确定了三层地震速度分别为6.5-6.7、6.35-6.40和6.8 km s〜（-1），且其上边界分别位于大约8、17和22 km深度（速度5.9 km s）。 〜（-1））和最上面的地幔（速度7.8 km s〜（-1））。纳尔默达北部（卡坦吉）和南部（贾巴尔普尔）断层之间的速度为6.5-6.7 km s〜（-1）的层很薄，且深度小于2 km。上地壳在这些断层之间显示出一种地心眼的特征，这表明纳尔默达带在上地壳的两个镁铁质侵入带之间起着隆起作用。深度为40-44 km的Moho边界和地壳内层显示出隆起，这表明Narmada断层的起源很深，涉及深部构造。 Narmada断层之间的侵入厚度比这些断层之外的侵入厚度要小，这表明两侧的侵入活动是独立的。这进一步表明，两个纳尔默达断层可能在不同的地质时期处于活动状态。地震模型受二维重力模型约束。 Narmada区两侧的重力高是由于上地壳高速/高密度镁铁质侵入作用的结果。

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