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On the Feasibility of Using the Dense MyShake Smartphone Array for Earthquake Location

机译：关于地震地区密集迈沙智能手机阵列的可行性

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摘要

MyShake is a growing smartphone-based network for seismological research applications. We study how dense array analysis of the seismic wavefield recorded by smartphones may enhance microearthquake monitoring in urban environments. In such areas, the microearthquake signal-to-noise ratio on smartphones is not well constrained. We address this issue by compiling a seismic noise model for the Los Angeles (LA) metropolitan area using over 500,000 seismograms recorded by stationary phones running MyShake. We confirm that smartphone noise level is reduced during nighttime, and identify strong noise sources such as major traffic highways, the LA airport, and the Long Beach seaport. The noise analysis shows that stationary smartphones are sensitive to human-induced ground motions, and therefore smartphone-derived seismograms may be used to infer the elastic properties of the shallow subsurface. We employ array backprojection analysis on synthetic data to estimate what fraction of LA's smartphone user population is required to install MyShake to enable the location of events whose induced ground motions are below the smartphone noise level. We find that having 0.5% of LA's population download the MyShake app would be sufficient to accurately locate M > 1 events recorded during nighttime by stationary phones located at epicentral distances < 5 km. Currently, the MyShake user coverage in LA is approaching a value that will allow us to locate events whose magnitude is near the regional catalog's magnitude of completeness.
机译：MyShake是一种越来越多的智能手机基地地震研究应用网络。我们研究智能手机记录的地震波场的抗体阵列分析如何提高城市环境中的微焦点监测。在这样的区域中，智能手机上的微焦点信噪比并不受到很好的限制。我们通过在运行Myshake的固定电话记录的500,000多种地震图编制洛杉矶（LA）大都市区的地震噪声模型来解决这个问题。我们确认在夜间期间智能手机噪音水平降低，并识别强大的噪音来源，如主要交通公路，洛杉矶机场和长滩海港。噪声分析表明，静止智能手机对人诱导的地面运动敏感，因此智能手机衍生的地震图可用于推断浅地下的弹性特性。我们采用阵列反投影分析综合数据来估计La的智能手机用户群体的一小部分来安装Myshake，以便启用诱导地面运动低于智能手机噪声水平的事件的位置。我们发现，有0.5％的La人口下载MyShake应用程序将足以准确地定位在夜间夜间纪录的M> 1个活动，位于震中距离<5公里。目前，LA中的Myshake用户覆盖率接近一个值，使我们能够找到幅度靠近区域目录的完整性幅度的事件。

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  • 来源
    《Seismological research letters》 |2019年第3期|共10页
  • 作者

    Inbal Asaf; Kong Qingkai; Savran William; Allen Richard M.;

  • 作者单位

    Tel Aviv Univ Dept Geophys Klausner St 17 IL-69978 Tel Aviv Israel;

    Univ Calif Berkeley Berkeley Seismol Lab McCone Hall 215 Haviland Path 4760 Berkeley CA 94703 USA;

    Univ Southern Calif 3651 Trousdale Pkwy Los Angeles CA 90089 USA;

    Univ Calif Berkeley Berkeley Seismol Lab McCone Hall 215 Haviland Path 4760 Berkeley CA 94703 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地震学;
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