• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >Seismic hazard in low slip rate crustal faults, estimating the characteristic event and the most hazardous zone: study case San Ramon Fault, in southern Andes
【2h】

Seismic hazard in low slip rate crustal faults, estimating the characteristic event and the most hazardous zone: study case San Ramon Fault, in southern Andes

机译：低滑动率地壳断层的地震危险性，估算特征事件和最危险区域：安第斯山脉南部的san Ramon断层研究案例

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Crustal faults located close to cities may induce catastrophic damages. When recurrence times are in the range of 1000-10000 or higher, actions to mitigate the effects of the associated earthquake are hampered by the lack of a full seismic record, and in many cases, also of geological evidences. In order to characterize the fault behavior and its effects, we propose three different already-developed time-integration methodologies to define the most likely scenarios of rupture, and then to quantify the hazard with an empirical equation of peak ground acceleration (PGA). We consider the following methodologies: (1) stream gradient and (2) sinuosity indexes to estimate fault-related topographic effects, and (3) gravity profiles across the fault to identify the fault scarp in the basement. We chose the San Ramon Fault on which to apply these methodologies. It is a similar to 30 km N-S trending fault with a low slip rate (0.1-0.5 mm yr(-1)) and an approximated recurrence of 9000 years. It is located in the foothills of the Andes near the large city of Santiago, the capital of Chile (> 6 000 000 inhabitants). Along the fault trace we define four segments, with a mean length of similar to 10 km, which probably become active independently. We tested the present-day seismic activity by deploying a local seismological network for 1 year, finding five events that are spatially related to the fault. In addition, fault geometry along the most evident scarp was imaged in terms of its electrical resistivity response by a high resolution TEM (transient electromagnetic) profile. Seismic event distribution and TEM imaging allowed the constraint of the fault dip angle (similar to 65 degrees) and its capacity to break into the surface. Using the empirical equation of Chiou and Youngs (2014) for crustal faults and considering the characteristic seismic event (thrust high-angle fault, similar to 10 km, M-w D 6.2-6.7), we estimate the acceleration distribution in Santiago and the hazardous zones. City domains that are under high risk include the hanging wall zone covered by sediments and narrow zones where the fault could break the surface. Over these domains horizontal PGA can be greater than 0.5 g and eventually produce building collapse
机译：靠近城市的地壳断层可能导致灾难性破坏。当重复发生时间在1000-10000或更长的时间范围内时，由于缺乏完整的地震记录，而且在许多情况下，也缺乏地质证据，阻碍了缓解相关地震影响的措施受到了阻碍。为了表征故障行为及其影响，我们提出了三种不同的已开发的时间积分方法来定义最可能的破裂情况，然后使用峰值地面加速度（PGA）的经验方程式对危险进行量化。我们考虑以下方法：（1）流量梯度和（2）弯曲度指数以估计断层相关的地形影响，以及（3）整个断层的重力剖面以识别地下室的断层。我们选择了在其上应用这些方法的圣拉蒙断层。它类似于30 km N-S趋势断层，具有低滑移率（0.1-0.5 mm yr（-1））和大约9000年的复发。它位于安第斯山脉的山脚下，靠近智利首都圣地亚哥（人口超过600万）大城市。沿着断层迹线，我们定义了四个段，平均长度大约为10 km，这些段可能会独立活动。我们通过部署本地地震网络1年，测试了当今的地震活动，发现了与断层在空间上相关的5个事件。另外，通过高分辨率TEM（瞬变电磁）剖面，根据其电阻率响应对沿最明显的断层的断层几何形状进行了成像。地震事件分布和TEM成像可以限制断层倾角（类似于65度）及其侵入地面的能力。利用Chiou和Youngs（2014）的地壳断层经验方程，并考虑特征地震事件（推力高角度断层，类似于10 km，Mw D 6.2-6.7），我们估算了圣地亚哥和危险区的加速度分布。高风险的城市区域包括被沉积物覆盖的上悬墙区域和断层可能破坏地表的狭窄区域。在这些区域上，水平PGA可能大于0.5 g，最终导致建筑物倒塌

著录项

相似文献

  • 外文文献
  • 中文文献
代理获取

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