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首页> 外文期刊>Seismological research letters >Deep Crustal Earthquakes in the Beaufort Sea, Western Canadian Arctic, from Teleseismic Depth Phase Analysis
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Deep Crustal Earthquakes in the Beaufort Sea, Western Canadian Arctic, from Teleseismic Depth Phase Analysis

机译：深层地区在Beaufort海中，西加拿大北极，来自Telesmic的深度相位分析

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摘要

The Beaufort Sea seismic cluster in the western Canadian Arctic is an active seismic zone characterized by approximately one magnitude = 4 intraplate earthquake per year. Determining the tectonic source of seismicity requires accurate hypocenter information, which is severely hampered by the scarcity of the regional and global seismograph networks in this area. We determine the focal depth of earthquakes with magnitude = 4 that occurred in the Beaufort Sea cluster since 1995 by analyzing the teleseismic P-wave coda containing a visible depth phase (pP and/or sP) observed at stations of the Global Seismic Network. Instead of identifying and picking the direct and depth phases, we calculate the envelope of the autocorrelation of vertical-component seismograms and stack them along either pP-P or sP-P delay time curves. Our results indicate that all moderate-size earthquakes have a focal depth between 18 and 40 km, with an uncertainty of 0.1-5 km. These depths likely correspond to the base of the crust and possibly subcrustal and favor a model of reactivation on high-dip fossil normal faults due to sediment loading at the Mackenzie delta. These deep earthquakes may potentially trigger submarine slope failure on the continental slope or shelf and could represent a source of hazard for the coastal communities.
机译：西加拿大北极的博览会海震群是一种有源地震区，其特征在于大约一个大小＆ =每年4个肿瘤地震。确定构造地震性源是准确的低血管信息，这严重阻碍了该地区区域和全球地震网络的稀缺。我们通过1995年自1995年以来，通过分析在全球地震网络的站观察到的含有可见深度阶段（PP和/或SP）的Telesmic P波Coda以来，在Beaufort Sea Clust中确定了地震的焦深。= 4。 。而不是识别和挑选直接和深度阶段，我们计算垂直组分地震图的自相关的包络，并沿PP-P或SP-P延迟时间曲线堆叠它们。我们的结果表明，所有中等大小的地震都有18到40公里的焦点，不确定度为0.1-5公里。这些深度可能对应于地壳的基础，并且可能是杀死沉积物荷塔沉积物负载引起的重新激活的重新激活模型。这些深海地震可能会触发大陆坡或架子上的潜艇斜坡故障，可以代表沿海社区的危害来源。

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  • 来源
    《Seismological research letters》 |2018年第4期|共6页
  • 作者

    Audet Pascal; Ma Shutian;

  • 作者单位

    Univ Ottawa Dept Earth &

    Environm Sci 120 Univ Private Ottawa ON K1N 6N5 Canada;

    Univ Ottawa Dept Earth &

    Environm Sci 120 Univ Private Ottawa ON K1N 6N5 Canada;

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  • 正文语种 eng
  • 中图分类 地震学;
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