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首页> 外文期刊>Seismological research letters >The 2017 Barrow Strait, Arctic Canada, Earthquake Sequence and Contemporaneous Regional Seismicity
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The 2017 Barrow Strait, Arctic Canada, Earthquake Sequence and Contemporaneous Regional Seismicity

机译：2017年的Barrow海峡，北极加拿大，地震序列和同期区域地震性

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On 8 January 2017 (23:47:11 UTC), a moment magnitude (M-w) 5.9 earthquake occurred in the Barrow Strait, 93 km southeast of Resolute, Nunavut, in the Canadian Arctic. This earthquake was one of the largest to occur in eastern Canada in the past 50 yrs. It was followed by 33 locatable aftershocks, two of which had an M-w greater than 5.0. Regional centroid moment tensor (RCMT) inversions for the mainshock and largest aftershocks are predominantly indicative of thrust faulting in response to northeast-southwest compression. These solutions are consistent with the broader regional stress field and with the orientation of mapped rift faults on nearby Somerset Island, although we cannot associate the Barrow Strait earthquakes with any specific fault. Moment tensor inversions and analyses of teleseismic depth phases all indicate that the mainshock was a deep crustal event that occurred at a depth of approximately 33-35 km. The aftershocks also appear to be deep, but their depths are not well constrained. The Barrow Strait mainshock was reported to have been felt in several communities, a rarity in the Arctic; this allowed us an opportunity to assess attenuation as a function of distance. In comparison to the 1988 Saguenay earthquake that occurred in southeastern Canada, which was of a similar size and depth, the felt reports are consistently of lower intensity, suggesting higher attenuation in the Arctic. A comparison of ground-motion prediction equations (GMPEs) to recorded signals also suggests higher attenuation of velocity in the Arctic. While the Barrow Strait aftershock sequence was ongoing, an M-w 4.7 earthquake occurred approximately 500 km northwest of Resolute. Analysis of seismicity rates shows that these events occurred during a time period of enhanced seismic activity in the Arctic. Similar periods of high activity have been observed over the past few decades, but they appear to be short-lived and not indicative of a long-term increase in seismic activity.
机译：2017年1月8日（23:47:11 UTC），一瞬间（M-W）5.9地震发生在巴罗海峡，东南93公里处，努纳武库，在加拿大北极。这种地震是在加拿大东部50年代最大的发生之一。其次是33个可定位的余震，其中两个具有大于5.0的M-W。主屏蔽和最大余震的区域质心矩张于（RCMT）逆势主要指示响应东北 - 西南压缩的推力断裂。这些解决方案与更广泛的区域应力场一致，并在附近的萨默塞特岛上的映射裂痕断层的取向，尽管我们不能将Barrow海峡地震与任何特定的故障相关联。 Telesismic Depth阶段的时刻张量逆向和分析都表明主席是一个深的地壳事件，其深度约为33-35公里。余震也看起来很深，但它们的深度并不受到很好的限制。据报道，武力海峡主斯克被认为是若干社区的感受，北极罕见;这让我们有机会评估衰减作为距离的函数。与1988年的萨格纳亚地震相比，加拿大东南部发生的大小和深度，毛毡报告一致强度较低，表明北极地区的衰减较高。地面运动预测等式（GMPE）对记录信号的比较也表明北极中的速度升高。虽然持续的Barrow海峡余震序列持续，但M-W 4.7地震发生了西北大约500公里。地震性率分析表明这些事件在北极地震活动增强的时期发生。在过去的几十年中，已经观察到类似的高活动时期，但它们似乎是短暂的，并且不指示抗震活动的长期增加。

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  • 来源
    《Seismological research letters》 |2018年第5期|共12页
  • 作者

    Bent Allison; Kolaj Michal; Ackerley Nicholas; Adams John; Halchuk Stephen;

  • 作者单位

    Nat Resources Canada 7 Observ Crescent Ottawa ON K1A 0Y3 Canada;

    Nat Resources Canada 7 Observ Crescent Ottawa ON K1A 0Y3 Canada;

    Nat Resources Canada 7 Observ Crescent Ottawa ON K1A 0Y3 Canada;

    Nat Resources Canada 7 Observ Crescent Ottawa ON K1A 0Y3 Canada;

    Nat Resources Canada 7 Observ Crescent Ottawa ON K1A 0Y3 Canada;

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  • 正文语种 eng
  • 中图分类 地震学;
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