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首页> 外文期刊>Seismological research letters >Aftershock Imaging with Dense Arrays (AIDA) Following the M-w 4.0 Waterboro Earthquake of 16 October 2012 Maine, USA
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Aftershock Imaging with Dense Arrays (AIDA) Following the M-w 4.0 Waterboro Earthquake of 16 October 2012 Maine, USA

机译：2012年10月16日美国缅因州M-w 4.0沃特波罗地震发生后，使用密集阵列（AIDA）进行余震成像

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摘要

Arrays of highly portable, exploration style seismographs were deployed following the 16 October 2012 M-w, 4.0 Waterboro, Maine, earthquake with the goal of improving hypocenter locations and source mechanisms of aftershocks, lowering the detection threshold for such aftershocks, and using the aftershocks as sources to image subsurface structure in the hypocentral volume. Based on the Aftershock Imaging with Dense Arrays (AIDA) experience following the Mineral, Virginia, earthquake of August 2011, the Maine deployment consisted of three complementary arrays totaling 110 stations: one array was for event detection and location, another for structural imaging, and a third for measuring regional attenuation. Although the arrays operated from day 3 through day 10 following the mainshock, only one aftershock was detected by the 43 stations that had been deployed at the time of the event. This aftershock was located at a focal depth of 6.9 +/- 0.15 km, with a horizontal uncertainty of similar to 0.15 km. Although the strike-slip focal mechanism for this aftershock differs from the thrust mechanism of the mainshock, both share an east-west maximum stress direction. Recordings of the aftershock from the high-density portion of the deployment show possible upper- and lower-crustal reflections that we attempt to image using vertical seismic profiling methods. However, the lack of redundant sources and the limited areal extent of the imaging arrays hinders any useful interpretation of the nature of the crustal reflections. Based on comparison with the Virginia experiment, in which numerous aftershocks were recorded, and from examining the signal-to-noise ratio of the single aftershock recorded, we believe the AIDA Maine deployment should have detected any aftershocks greater than magnitude m(b) of approximately -2.5. That only one aftershock was detected supports the observation that earthquakes in some intraplate areas are notable for their lack of aftershock activity down to this level.
机译：在2012年10月16日缅因州沃特伯勒4.0级地震发生后，部署了一系列便携式，地震式地震仪，目的是改善震源位置和余震源机制，降低此类余震的探测阈值，并将余震用作震源。在低中心体积中成像地下结构。根据2011年8月弗吉尼亚州矿产地震后的密集阵列余震成像（AIDA）经验，缅因州部署包括三个互补阵列，共110个站：一个阵列用于事件检测和定位，另一个阵列用于结构成像，以及三分之一用于测量区域衰减。尽管阵列从主震发生后的第3天到第10天运行，但在事件发生时已部署的43个台站仅检测到一次余震。余震位于6.9 +/- 0.15 km的震源深度，水平不确定度接近0.15 km。尽管此余震的走滑震源机制与主震的推力机制不同，但两者共享东西向最大应力方向。部署高密度部分的余震记录显示了我们尝试使用垂直地震剖面法成像的可能的上，下地壳反射。但是，缺少冗余光源和成像阵列的面积有限，阻碍了对地壳反射性质的任何有用解释。根据与记录了许多余震的弗吉尼亚实验的比较，并且通过检查记录的单个余震的信噪比，我们相信AIDA缅因州的部署应该已经检测到了大于m（b）级的余震。大约-2.5。仅有一次余震被发现支持了这样的观察，即某些板内地区的地震由于缺乏余震活动而降至这一水平。

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