...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Asian earth sciences >Seismic b-value anomalies in the Sumatran region: Seismotectonic implications
【24h】

Seismic b-value anomalies in the Sumatran region: Seismotectonic implications

机译：苏门答腊地区的地震b值异常：地震构造的意义

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 spatial variations in the seismic b-value, seismic moment, Bouguer gravity change and fault-plane solution are estimated in the Sumatran region based on homogeneous seismicity data from June 2005 to March 2012 to investigate the seismotectonic characteristics and tectonic activity between the 2004 Sumatran earthquake and the 2012 East Indian Ocean earthquakes. Based on changes in the seismicity rate, this time period is divided into five intervals with different earthquake distributions and faulting styles. The seismic b-values, faulting mechanisms and seismic moment release values are mapped throughout the Sumatran region, and the gravity change every two years between the 2004 event and the 2012 events are determined from satellite (GRACE) gravity data. The b-values vary from 0.45 to 1.59, and an inverse correlation is observed between the b-values and convergence rates. Low b-values are located at depths between 20 km and 40 km in the subduction zone and between 20 km and 35 km in the oceanic plate; the lowest b-values are located at a depth of approximately 28 km in both regions, which indicates a homogeneous fault system between them. The areas with low b-values are associated with megathrust and strike-slip mechanisms, while the area with the lowest b-values is dominated by a megathrust mechanism. Seismically active regions have low b-values associated with a high stress accumulation and high seismic moment release. Low b-value areas are located mainly along the Andaman-Sunda Trench and Andaman-Nicobar-Sumatra forearc. Temporal variations in the seismicity distribution and faulting style are recognized with temporal variations in the b-values in each period. Relationships exist between the epicenter of the 2004 event and the location of the maximum Bouguer gravity change in 2012 and between the epicenters of the 2012 events and the location of the maximum Bouguer gravity change in 2004. Furthermore, a zone of continuous 2-year positive gravity change is located near the Nicobar Islands. The 2004 event boost the 2012 events and intraplate seismicity via stress transfer. The seismicity distributions in individual periods within the studied timeframe highlight the active and locked portions of the fault systems.
机译：根据2005年6月至2012年3月的均匀地震数据，估算了苏门答腊地区地震b值，地震矩，布格重力变化和断层平面解的空间变化，以调查2004年苏门答腊之间的地震构造特征和构造活动地震和2012年东印度洋地震。根据地震活动率的变化，将这段时间分为五个间隔，每个间隔具有不同的地震分布和断层样式。在苏门答腊地区绘制了地震b值，断层机制和地震矩释放值，并根据卫星（GRACE）重力数据确定了2004年事件和2012年事件之间每两年的重力变化。 b值从0.45到1.59不等，并且在b值和收敛速度之间观察到反相关。低b值位于俯冲带20 km至40 km的深处，而洋盘区位于20 km至35 km的深处； b值最低的两个区域都位于约28 km的深度，这表明它们之间存在均质的断层系统。 b值低的区域与超推力和走滑机制相关，而b值最低的区域则由超推力机制主导。地震活动区具有较低的b值，与较高的应力积累和较高的地震矩释放相关。低b值区域主要位于Andaman-Sunda海沟和Andaman-Nicobar-Sumatra前臂。地震活动性分布和断层样式的时间变化可以通过每个时期b值的时间变化来识别。 2004年事件的震中与2012年布格最大重力变化的位置之间以及2012年事件的震中与2004年布格最大重力变化的位置之间存在关系。此外，连续两年的正值区域重力变化位于尼科巴群岛附近。 2004年的事件通过应力传递增强了2012年的事件和板内地震活动。在研究的时间范围内，各个时期的地震活动性分布突出显示了断层系统的活动部分和锁定部分。

著录项

  • 来源
    《Journal of Asian earth sciences》 |2019年第15期|29-41|共13页
  • 作者

    Gui Zhou; Bai Yongliang; Wang Zhenjie; Li Tongfei;

  • 作者单位

    China Univ Petr East China, Sch Geosci, Qingdao 266580, Shandong, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Shandong, Peoples R China;

    China Univ Petr East China, Sch Geosci, Qingdao 266580, Shandong, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Shandong, Peoples R China;

    China Univ Petr East China, Sch Geosci, Qingdao 266580, Shandong, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Shandong, Peoples R China;

    China Univ Geosci, Fac Earth Resources, Wuhan 430074, Hubei, Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sumatran region; Seismic b-value; Bouguer gravity change; Seismotectonic characteristics; Tectonic activity;

    机译：苏门答腊地区地震b值布格重力变化地震构造特征构造活动;

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