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Characteristics of microseisms recorded by the Earthscope Transportable Array.

机译：Earthscope可移动阵列记录的微震特征。

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摘要

I analyzed the characteristics of microseisms recorded in the United States by Earthscope Transportable Array (TA) broadband stations during the calendar year of 2009 and a 19-day period of October-November 2012. I used eigen-decomposition of spectral covariance matrices to extract power and polarization information for each hour of data recorded at each seismometer. For the continuous data from 2009, I generated array-averaged spectrograms and geographical animations to locate individual microseisms. Then, I grouped and cataloged those microseisms according to their initiation time, duration, peak power, average power, dominant period, variation in their period content, degree of polarization, and their azimuths obtained from polarization ellipsoids. Over 78 distinct microseismic events were identified and grouped into four different types. The longest duration microseismic signal occurred in the month of December, 2009, for more than 280 hours and was associated with the propagation of two storms: one from the Gulf of Alaska region and another from the Newfoundland region. The most powerful signal was also recorded in the same month with an average peak period near 6-sec on December 28-31, 2009, and resulted from wave action associated with two different unnamed storms in the East-Central Pacific and North Atlantic oceans. The seismic observations were compared to excitation predictions computed with the power spectral density of the equivalent pressure generated by ocean gravity waves using the WAVEWATCH-III ocean wave model from the French Research Institute for Exploitation of the Sea (Ifremer). Microseismic excitation predictions were calculated both with and without coastline reflections.;I also processed continuous TA seismic data from 17 October-4 November, 2012, coinciding with the passage of Hurricane Sandy. I determined and tracked locations of microseisms as the hurricane propagated from South to North along the U.S. Atlantic coast. I found that the maximum microseismic power and degree of polarization occurred when Sandy made its westward turn towards New York on October 29, 2012. I also found two microseism source locations in the North Atlantic and Northeast Pacific oceans related to two different storms systems. The locations obtained from the seismic results were compared to the ocean wave models obtained from Ifremer.
机译：我分析了在2009日历年和2012年10月至11月的19天期间，美国Earthscope可移动阵列（TA）宽带电台在美国记录的微震特征。我使用频谱协方差矩阵的特征分解来提取功率。每个地震仪记录的每小时数据的极化信息。对于2009年以来的连续数据，我生成了阵列平均频谱图和地理动画，以定位各个微地震。然后，我根据这些微地震的起始时间，持续时间，峰值功率，平均功率，主导周期，其周期含量的变化，极化程度以及从极化椭球获得的方位角对这些地震进行了分组和分类。超过78个不同的微震事件被识别并分为四种不同的类型。持续时间最长的微地震信号发生在2009年12月，持续了280多个小时，并与两次风暴的传播有关：一次来自阿拉斯加湾地区，另一次来自纽芬兰地区。 2009年12月28日至31日，最强的信号也记录在同一月份，平均峰值时段接近6秒，这是由东中太平洋和北大西洋的两次不同的未命名风暴引起的波浪作用引起的。使用法国海洋开发研究所（Ifremer）的WAVEWATCH-III海浪模型，将地震观测结果与以海洋重力波产生的等效压力的功率谱密度计算的激发预测进行了比较。计算了有和没有海岸线反射时的微地震激发预测。；我还处理了2012年10月17日至11月4日的连续TA地震数据，这与飓风桑迪的通过时间一致。当飓风沿着美国大西洋沿岸从南向北传播时，我确定并跟踪了微地震的位置。我发现最大的微震功率和极化度发生在桑迪于2012年10月29日向西转向纽约时。我还发现北大西洋和东北太平洋的两个微震源位置与两个不同的风暴系统有关。将地震结果获得的位置与从Ifremer获得的海浪模型进行了比较。

著录项

  • 作者

    Sufri, Oner.;

  • 作者单位

    The University of Utah.;

  • 授予单位 The University of Utah.;
  • 学科 Geophysics.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 126 p.
  • 总页数 126
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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