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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Seismicity of block-and-ash flows occurring during the 2006 eruption of Augustine Volcano, Alaska
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Seismicity of block-and-ash flows occurring during the 2006 eruption of Augustine Volcano, Alaska

机译：2006年在阿拉斯加的奥古斯丁火山喷发期间发生的灰烬流的地震活动

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In January 2006, Augustine Volcano began erupting following an increase in seismicity that was first noted in late April 2005. Thirteen large explosive eruptions of Augustine occurred from January 11 to 28, 2006, followed by a continuously erupting phase and then by a dome growth phase in which numerous pyroclastic flows and block-and-ash flows occurred. As a new steep-sided and unstable dome grew in spring 2006, rock-falls and related events, likely block-and-ash flows, dominated the seismic record. Relative amplitudes at pairs of seismic stations for 68 block-and-ash flow events were examined to constrain locations of the flow-events. Higher amplitudes were associated with events closer to a given station. These relations were confirmed by images collected on a low-light camera. Captured images show a correlation between flow direction and seismic amplitude ratios from nearby stations AUE and AUW. Seismic amplitudes and energies of the flow signals, measured in several different ways, were found to correlate with the surface areas and run-out distances of the flows. The M_L range of rockfalls was 0.1 to 1.1, and seismic efficiencies were estimated to be much less than 1%. Particle motion analyses showed that the seismic waves contained both body waves and surface waves and demonstrate that the flows were acting as moving sources with velocities of 30-93 m/s.
机译：2006年1月，在2005年4月下旬首次注意到地震活动增加之后，奥古斯丁火山开始爆发。从2006年1月11日至28日，奥古斯丁发生了13次大爆炸性爆发，随后是连续爆发阶段，然后是穹顶生长阶段。其中发生了许多火山碎屑流和块灰流。随着2006年春季新的陡峭且不稳定的穹顶的生长，落石和相关事件（可能是灰烬和灰烬的流动）主导了地震记录。检查了68个块状和灰分流动事件在地震台对处的相对振幅，以约束流动事件的位置。较高的振幅与更靠近给定台站的事件有关。这些关系已通过在弱光相机上收集的图像得到证实。所捕获的图像显示了来自附近站点AUE和AUW的流向与地震振幅比之间的相关性。发现以几种不同方式测量的流量信号的地震振幅和能量与流量的表面积和跳动距离相关。落石的M_L范围为0.1到1.1，地震效率估计远低于1％。质点运动分析表明，地震波既包含体波又包含面波，并表明流是速度为30-93 m / s的移动源。

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