...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of African earth sciences >Seismic hazard maps of Egypt based on spatially smoothed seismicity model and recent seismotectonic models
【24h】

Seismic hazard maps of Egypt based on spatially smoothed seismicity model and recent seismotectonic models

机译：基于空间平滑地震性模型和最近地震型模型的埃及地震危险地图

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

An earthquake catalogue of Egypt is a vital element for seismotectonic and seismic hazard studies using different approaches. Therefore, an updated earthquake catalogue for Egypt and its circumference is collected. The collected earthquake catalogue includes the historical and the instrumental seismic records. Data sets of all earthquakes with a magnitude (M), M = 3, on any magnitude scale mentioned in local, regional, and inter- national sources are included. The collected catalogue contains 5894 earthquakes. Contaminated events, low reliability, and duplicate events are identified using the available current knowledge and then have been removed. Special priorities were considered through the removing process. The processed catalogue contains 4776 earthquakes. We searched for the moment magnitude (Mw) of each earthquake in the original data sources and publications. When Mw is not available, the moment magnitude is calculated through empirical relationships which are obtained in the current study using the orthogonal regression method. The catalogue is de-clustered aiming to eliminate the dependent events using three de-clustering techniques. Completeness test of the entire catalogue is performed. Based on the processed catalogue, the spatial diversity of the Egyptian seismic activity is represented for the first time. The a-value, b-value, and the maximum estimated magnitude of the recently delineated Egyptian seismic source zones are calculated. Probabilistic seismic hazard assessment (PSHA) is calculated using two recently delineated seismotectonic models, two different smoothed seismicity maps and three ground motion prediction equations (GMPEs). Different seismotectonic models and GMPEs are put into the logic-tree practice for treating the epistemic uncertainties accompanying the hazard calculations. The produced seismic hazard maps represent the peak ground acceleration (PGA) and the spectral acceleration (SA) corresponding to 0.2 and 1 s (s) natural vibration periods for 475 and 2475 years return periods (RPs). The produced hazard maps illustrate that the Gulf of Aqaba area is exposed to the highest acceleration, while the Western Desert is exposed to the lowest ones. For instance, the map of PGA for 475 years RP shows PGA values of 0.229 g close to the Gulf of Aqaba and 0.005 g at the Western Desert.
机译：埃及的地震目录是使用不同方法的地震和地震危害研究的重要因素。因此，收集埃及及其周长的更新的地震目录。收集的地震目录包括历史和乐器地震记录。包括幅度（m），m> 3的所有地震的数据集，在本地，区域和国家跨国公司中提到的任何幅度规模。收集的目录包含5894个地震。使用可用的当前知识识别污染的事件，低可靠性和重复事件，然后已删除。通过去除过程考虑了特殊优先事项。已加工的目录包含4776个地震。我们在原始数据来源和出版物中搜索了每种地震的矩幅度（MW）。当不可用MW时，通过使用正交回归方法在当前研究中获得的经验关系来计算瞬间幅度。目录是使用三种脱簇技术消除依赖事件的解聚类。执行整个目录的完整性测试。基于加工的目录，埃及地震活动的空间分集首次表示。计算了最近描绘的埃及地震源区最近划定的埃及地震源区的a值，b值和最大估计幅度。概率地震危害评估（PSHA）使用两个最近描绘的地震型模型计算，两个不同的平滑地震性图和三个地运动预测方程（GMPE）计算。不同的地震型模型和GMPES投入逻辑树实践，以治疗伴随危险计算的认知不确定性。产生的地震危险贴图代表峰接地加速度（PGA）和对应于0.2和1的光谱加速度（SA），对应于475和2475年返回期（RPS）的0.2和1秒的自然振动周期。所产生的危险图说明了AQABA区域的海湾暴露于最高加速度，而西部沙漠暴露于最低的加速度。例如，PGA的地图475年RP显示PGA值为0.229g，靠近西部沙漠的AQABA和0.005克的湾。

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