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High resolution earthquake locations and velocity models in the New Madrid Seismic Zone.

机译：新马德里地震带中的高分辨率地震位置和速度模型。

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摘要

High resolution earthquake relocations and velocity models have been calculated for the New Madrid Seismic Zone (NMSZ) using the double-difference algorithm (?). The NMSZ is the most active intraplate seismic zone in the United States, famous for three large earthquakes that occurred in 1811-1812. On average approximately 200 earthquakes occur along the four major arms of seismicity each year. The four major arms of seismicity are examined through earthquake relocations using the double-difference program hypoDD (?). HypoDD uses differential catalog and waveform cross correlation (WCC) times to calculate relative earthquake locations. The data set consisted of earthquakes recorded between 2000-2006 by the New Madrid Cooperative Seismic Network on three component stations. The relocations provide a sharper image of the individual faults at depth.Geologic features and rock properties that could affect the generation of present day seismicity in the NMSZ are investigated through travel time tomography. The double-difference algorithm was expanded to include not only differential times but also absolute P and S wave travel times to infer velocity structure, implemented in the program tomoDD (?). The hypoDD data set was expanded to include network earthquakes recorded in 2007, as well as the addition of earthquakes recorded between 1989-1992 using the temporary PANDA deployment. Results of the velocity inversion focused on the Reelfoot Fault (RF), a reverse fault which produces a majority of earthquakes in the NMSZ. Results indicate normal P and S wave velocities along the northern portion of the RF fault relative to the 1-D starting model. P and S wave velocity models along the southern portion of the RF indicate a decrease in velocities, suggesting an increase in pore fluid pressure and fracturing. A mafic intrusion that has been imaged in previous tomography studies, as well as gravity and magnetics, is also imaged.
机译：已使用双差算法（？）计算了新马德里地震带（NMSZ）的高分辨率地震位移和速度模型。 NMSZ是美国最活跃的板内地震带，以1811年至1812年发生的三场大地震而闻名。沿着地震活动的四个主要方面，平均每年大约发生200次地震。使用双差程序hypoDD（？）通过地震迁移来检查地震活动的四个主要方面。 HypoDD使用差分目录和波形互相关（WCC）时间来计算相对地震位置。该数据集由新马德里合作地震台网在三个组成站点上记录的2000年至2006年之间的地震组成。通过移动时间层析成像技术研究了可能影响NMSZ当前地震活动产生的地质特征和岩石特性，从而使重新定位提供了更清晰的深度单个断层图像。将双差算法扩展到不仅包括差时间，而且还包括绝对P和S波传播时间以推断速度结构，该方法在tomoDD（？）程序中实现。 hypoDD数据集已扩展到包括2007年记录的网络地震，以及使用PANDA临时部署在1989-1992年之间记录的地震。速度反演的结果集中在Reelfoot断层（RF），这是一个在NMSZ中产生大部分地震的反向断层。结果表明，相对于一维初始模型，沿RF断层北部的P波和S波速度正常。沿RF南部的P和S波速度模型表明速度降低，表明孔隙流体压力和压裂增加。在先前的层析成像研究中已经成像过的黑手党侵入物，以及重力和磁场也都得到了成像。

著录项

  • 作者

    Dunn, Meredith M.;

  • 作者单位

    The University of Memphis.;

  • 授予单位 The University of Memphis.;
  • 学科 Geophysics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 141 p.
  • 总页数 141
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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