...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Pure and Applied Geophysics >Probabilistic seismic hazard assessment for Iraq using complete earthquake catalogue files
【24h】

Probabilistic seismic hazard assessment for Iraq using complete earthquake catalogue files

机译：使用完整的地震目录文件对伊拉克进行概率地震灾害评估

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

Probabilistic seismic hazard analysis (PSHA) has been carried out for Iraq. The earthquake catalogue used in the present study covers an area between latitude 29 degrees - 38.5 degrees N and longitude 39 degrees - 50 degrees E containing more than a thousand events for the period 1905 - 2000. The entire Iraq region has been divided into thirteen seismogenic sources based on their seismic characteristics, geological setting and tectonic framework. The completeness of the seismicity catalogue has been checked using the method proposed by STEPP ( 1972). The analysis of completeness shows that the earthquake catalogue is not complete below M-s = 4.8 for all of Iraq and seismic source zones S1, S4, S5, and S8, while it varies for the other seismic zones. A statistical treatment of completeness of the data. le was carried out in each of the magnitude classes. The Frequency Magnitude Distributions (FMD) for the study area including all seismic source zones were established and the minimum magnitude of complete reporting (M-c) were then estimated. For the entire Iraq the M-c was estimated to be about M-s = 4.0 while S11 shows the lowest M-c to be about M-s = 3.5 and the highest M-c of about M-s = 4.2 was observed for S4. The earthquake activity parameters ( activity rate lambda, b value, maximum regional magnitude m(max)) as well as the mean return period ( R) with a certain lower magnitude m(min) >= m along with their probability of occurrence have been determined for all thirteen seismic source zones of Iraq. The maximum regional magnitude m(max) was estimated as 7.87 +/- 0.86 for entire Iraq. The return period for magnitude 6.0 is largest for source zone S3 which is estimated to be 705 years while the smallest value is estimated as 9.9 years for all of Iraq.The large variation of the b parameter and the hazard level from zone to zone reflects crustal heterogeneity and the high seismotectonic complexity. The seismic hazard near the source boundaries is directly and strongly affected by the change in the delineation of these boundaries. The forces, through which the geological structure along the plate boundary in Eastern and Northeastern Iraq are evolved, are still active causing stress-strain accumulation, deformation and in turn producing higher probabilities of earthquake activity. Thus, relatively large destructive earthquakes are expected in this region. The study is intended to serve as a reference for more advanced approaches and to pave the path for the probabilistic assessment of seismic hazard in this region.
机译：已经对伊拉克进行了概率地震危险性分析（PSHA）。本研究中使用的地震目录覆盖了北纬29度-38.5度和东经39度-50度之间的区域，其中包含1905年至2000年期间的1000多个事件。整个伊拉克地区被划分为13个地震成因根据其地震特征，地质环境和构造框架来确定。已使用STEPP（1972）提出的方法检查了地震活动目录的完整性。完整性分析表明，对于所有伊拉克和地震震源区S1，S4，S5和S8，在M-s = 4.8以下，地震目录都不完整，而对于其他地震区却有所不同。对数据完整性的统计处理。 le在每个量级类别中进行。建立了包括所有地震源区在内的研究区域的频率幅度分布（FMD），然后估算了完整报告的最小幅度（M-c）。对于整个伊拉克，M-c估计约为M-s = 4.0，而S11显示最低的M-c约为M-s = 3.5，而S4的最高M-c约为M-s = 4.2。已经确定了地震活动参数（活动率λ，b值，最大区域震级m（max））以及某个较低震级m（min）> = m的平均返回周期（R）及其发生概率。确定为伊拉克所有的13个地震震源区。整个伊拉克的最大区域震级m（max）估计为7.87 +/- 0.86。震源区S3的6.0级返回期最大，估计为705年，而对整个伊拉克来说，最小值的返回期估计为9.9年.b参数的巨大变化以及区域之间的危险程度反映了地壳异质性和高地震构造复杂性。源边界附近的地震危险直接受到这些边界轮廓变化的强烈影响。沿伊拉克东部和东北板块边界的地质结构演化所产生的力仍然活跃，从而引起应力应变累积，变形，从而产生更高的地震活动可能性。因此，预计该地区将发生相对较大的破坏性地震。该研究旨在为更高级的方法提供参考，并为对该地区地震灾害的概率评估铺平道路。

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