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Time-lapse monitoring of velocity changes in Utah

机译:犹他州速度变化的时滞监测

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摘要

The Eastern part of the Basin and Range, extending to the Wasatch fault region, is an actively deforming region characterized by varieties of extensive features and prominent seismicity along the intermountain seismic belt. The present-day deformation of the intermountain seismic belt and the eastern Basin and Range province motivates an interest in continuous monitoring of the region. In this study we monitor time-lapse velocity changes within Utah and eastern Nevada using coda waves generated by repeatable explosions. This monitoring characterizes velocity changes within the region from June to September of 2007. We observe, both temporally and spatially, variable velocity changes within the monitored region, with a maximum path average velocity change of 0.2%. This suggests a significant change in the velocity within the region given the short monitoring duration. Correlation of the temporal variation of the average velocity change with strains derived from GPS-detrended displacements suggests that the velocity change might be driven by the broad deformation within the monitored region.
机译:盆地和山脉东部一直延伸到沃萨奇断裂带,是一个活跃的变形地区,其特征是沿山间地震带具有广泛的特征和突出的地震活动性。山间地震带和东部盆地和兰治省的当前变形激发了对该地区进行连续监测的兴趣。在这项研究中,我们使用可重复爆炸产生的尾波监测犹他州和内华达州东部的时移速度变化。此监视的特征是2007年6月至2007年9月该区域内的速度变化。我们在时间和空间上都观察到了受监视区域内的速度变化,最大路径平均速度变化为0.2%。这表明,在较短的监视持续时间内,该区域内的速度将发生显着变化。平均速度变化的时间变化与GPS趋向位移产生的应变之间的相关性表明,速度变化可能受监测区域内的大变形驱动。

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