• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Seismic Velocity Structure and Event Relocation in Kazakhstan From Secondary PPhases
【24h】

Seismic Velocity Structure and Event Relocation in Kazakhstan From Secondary PPhases

机译：哈萨克斯坦二级pp的地震速度结构和事件重新定位

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Three-component seismic data from a set of presumed explosions recorded bystations at Bayanaul and karkaralinsk in Kazakhstan were analyzed in order to model the crustal structure of the region and to examine the use of the arrival times of secondary P phases, primarily PmP, in regional event location. Polarization analysis aided in the identification of the secondary phases. Low-pass filtered data (4-Hz corner) from the first 5 to 10 sec of 13 presumed explosions were modeled with the reflectivity method. The two chemical explosions in 1987 provided a check on accuracy, as their locations and origin times are accurately known. A good fit to the arrival times and amplitudes in the first 5 sec of the P wave (Pn, Pg, and PmP) was obtained in the epicentral distance range of 100 to 300 km. Beyond 300 km, the simple layered model was not adequate to model the PmP arrival. The crustal P-wave velocity model were derived has an upper crustal velocity increasing fairly rapidly from 4.5 km/sec near the surface to 6.5 km/sec at 15-km depth, then increasing more slowly to 7.05 km/ sec at 50-km depth. The observed difference in the arrival times of the phases Pg, PmP, and

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