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Nonlinear Site Effects from the 30 November 2018 Anchorage, Alaska, Earthquake
Bulletin of the Seismological Society of America ( IF 2.6 ) Pub Date : 2021-08-01 , DOI: 10.1785/0120200347
John D. Thornley 1, 2 , Utpal Dutta 3 , John Douglas 2 , Zhaohui (Joey) Yang 3
Affiliation  

Anchorage, Alaska, is a natural laboratory for recording strong ground motions from a variety of earthquake sources. The city is situated in a tectonic region that includes the interface and intraslab earthquakes related to the subducting Pacific plate and crustal earthquakes from the upper North American plate. The generalized inversion technique was used with a local rock reference station to develop site response at >20 strong‐motion stations in Anchorage. A database of 94 events recorded at these sites from 2005 to 2019 was also compiled and processed to compare their site response with those in the 2018 Mw 7.1 event (main event). The database is divided into three datasets, including 75 events prior to the main event, the main event, and 19 aftershocks. The stations were subdivided into the site classes defined in the National Earthquake Hazards Reduction Program based on estimated average shear‐wave velocity in of the upper 30 m (⁠VS30⁠), and site‐response results from the datasets were compared. Nonlinear site response was observed at class D and DE sites (⁠VS30 of 215–300 and 150–215 m/s⁠, respectively) but not at class CD and C sites (⁠VS30 of 300–440 and 440–640 m/s⁠, respectively). The relationship of peak ground acceleration versus peak ground velocity divided by VS30 (shear‐strain proxy) was shown to further support the observation that sites with lower VS30 experienced nonlinear site response.

中文翻译:

2018 年 11 月 30 日阿拉斯加安克雷奇地震的非线性场地效应

阿拉斯加州安克雷奇是一个天然实验室,用于记录来自各种地震源的强烈地面运动。该市位于构造区域,包括与俯冲太平洋板块和北美板块上部地壳地震相关的界面地震和板内地震。广义反演技术与当地岩石参考站一起使用,以开发安克雷奇 >20 个强运动站的现场响应。还编译和处理了一个包含 2005 年至 2019 年在这些站点记录的 94 个事件的数据库,以将其站点响应与 2018 年 Mw 7.1 事件(主要事件)中的响应进行比较。数据库分为三个数据集,包括75个主震前、主震和19个余震。根据估计的上部 30 m (⁠VS30⁠) 平均剪切波速度,将台站细分为国家地震减灾计划中定义的站点类别,并对数据集的站点响应结果进行比较。在 D 类和 DE 类站点(分别为 215–300 和 150–215 m/s 的 VS30 处)观察到非线性站点响应,但在 CD 类和 C 类站点(300–440 和 440–640 m/s 的 VS30 s,分别)。峰值地面加速度与峰值地面速度除以 VS30(剪切应变代理)的关系显示出进一步支持具有较低 VS30 的站点经历非线性站点响应的观察结果。在 D 类和 DE 类站点(分别为 215–300 和 150–215 m/s 的 VS30 处)观察到非线性站点响应,但在 CD 类和 C 类站点(300–440 和 440–640 m/s 的 VS30 s,分别)。峰值地面加速度与峰值地面速度除以 VS30(剪切应变代理)的关系显示出进一步支持具有较低 VS30 的站点经历非线性站点响应的观察结果。在 D 类和 DE 类站点(分别为 215–300 和 150–215 m/s 的 VS30 处)观察到非线性站点响应,但在 CD 类和 C 类站点(300–440 和 440–640 m/s 的 VS30 s,分别)。峰值地面加速度与峰值地面速度除以 VS30(剪切应变代理)的关系显示出进一步支持具有较低 VS30 的站点经历非线性站点响应的观察结果。
更新日期:2021-07-23
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