• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>World conference on earthquake engineering >GROUND MOTIONS FROM LARGE EARTHQUAKES (MW~37) ON THE SANTA MONICA MOUNTAIN THRUST AND HOLLYWOOD-SANTA MONICA-MALIBU FAULTS
【24h】

GROUND MOTIONS FROM LARGE EARTHQUAKES (MW~37) ON THE SANTA MONICA MOUNTAIN THRUST AND HOLLYWOOD-SANTA MONICA-MALIBU FAULTS

机译：来自大地震（MW〜37）的地面运动在圣莫尼卡山推力和好莱坞 - 圣塔莫尼卡 - 马里布故障

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

摘要

We have simulated ground motion parameters for engineering use at eighteen urban centers located along the Santa Monica Mountain fault system for earthquakes occurring on the Hollywood-Santa Monica-Malibu (HF-SMF-MF) and Santa Monic Mountain Thrust (SMMTF) faults. These urban centers, which include Beverly Hills, Westwood, Sherman Oaks, Santa Monica, Century City, and downtown Los Angeles, have many multi-story buildings. Of these, thirteen have CSMIP strong motion instruments which recorded the 1994 Northridge earthquake. In this study, we considered three earthquake scenarios: a M_w 7 earthquake on the HF-SMF-MF fault which has a dip of 70° and a strike of 255.8° for the HF, 239.8° For the SMF and 270° For the MF, and a rake of 5°;a M_w 7 earthquake on the buried SMMTF which has a dip of 20° a strike of 258.5° And rake of 90°,and a M_w 7.2 earthquake which is generated by a simultaneous rupturing of these two faults. To produce ground motion parameter for the simultaneous rupture, broadband time histories simulated for the two fault systems were added with appropriate time lags. Each M_w 7 earthquake was simulated using a fault surface with a length of 52km and a width of 18km. Broadband time histories were simulated using 9 hypocenters and 10 randomly generated slip models. Thus for each site, we simulated a total of 180 horizontal component ground motion time histories for each earthquake scenario. To further investigate the influence of basin structure on levels of ground motions at each site, we conducted two separate simulations; one with a common 1D structure for all sites which has a surface shear-wave velocity of 1km/sec and the other with site-specific velocity structure extracted from the updated 3D velocity structure of the Los Angeles basin (SCEC, 1998). In these site-specific models the surface shear-wave velocity are as low as 0.5km/sec. Based on this simulation study, we conclude that the peak ground accelerations from the Hollywood fault dominate the ground motions from the Santa Monica Mountain thrust fault system. In general, peak ground accelerations from the Hollywood fault earthquake are 2 to 2.5 times larger than the peak ground accelerations from the Santa Monica Mountain thrust fault at sites hsbg, shro, nhol, lacc, smn, bvh, ulg, la19, and ul7. These large motions are primarily caused by the shallow depth and proximity of the Hollywood-Santa Monica fault to the selected sites. This shallow depth of the Hollywood-Santa Monica fault system also contributes significantly to the long-period ground motions. Results of this simulation study are briefly summarized in this study.
机译：我们在沿着Santa Monica-Malibu（HF-SMF-MF）和Santa Monic Mountain推力（SMMTF）故障的地震中，在位于Santa Monica山故障系统的18个城市中心的工程使用模拟地面运动参数。这些城市中心包括Beverly Hills，Westwood，Sherman Oaks，Santa Monica，Century City和Downtown Los Angeles，有许多多层建筑。其中，十三有CSMIP强大的运动仪器，记录了1994年的北极地震。在这项研究中，我们考虑了三种地震场景：HF-SMF-MF故障的M_W 7地震，其倾角为70°，对于HF，SMF的239.8°和270°为255.8°的击球。和5°的耙子;埋藏的SMMTF上的M_W 7地震，倾角为20°，击球258.5°和90°的耙子，以及通过同时破裂这两个故障而产生的M_W 7.2发生地震。为了产生同时破裂的地面运动参数，在适当的时间滞后添加两个故障系统模拟的宽带时间历史。使用具有52km的故障表面模拟每个M_W 7地震，宽度为18km。宽带时间历史是使用9个斜视，10个随机产生的滑动模型进行模拟。因此，对于每个站点，我们为每个地震场景模拟了总共180个水平分量地面运动时间历史。为了进一步研究盆地结构对每个部位的地面运动水平的影响，我们进行了两个单独的模拟;对于具有1km / sec的表面剪切波速度的所有位点的一个具有常见的1D结构，另一个具有从洛杉矶盆地的更新的3D速度结构中提取的位点特定的速度结构（Scec，1998）。在这些场地特定型号中，表面剪切波速度低至0.5km / sec。基于该模拟研究，我们得出结论，从好莱坞故障的峰接地加速占据了圣莫尼卡山推力故障系统的地面运动。一般而言，来自好莱坞故障地震的峰接地加速度比Sites HSBG，雪草，NOT，LACC，SMN，BVH，ULG，LA19和UL7的Santa Monica Mountain推力故障的峰接地加速度大2至2.5倍。这些大型动作主要由所选地点的好莱坞 - 圣Monica故障的浅层和近距离引起。这款浅层深度的好莱坞 - 圣达马尼卡故障系统也有助于长期的地面运动。本研究简要概述了该模拟研究的结果。

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