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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >A physical model of the high-frequency seismic signal generated by debris flows
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A physical model of the high-frequency seismic signal generated by debris flows

机译：碎片流动产生的高频地震信号的物理模型

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We propose a physical model for the high-frequency (>1 Hz) spectral distribution of seismic power generated by debris flows. The modeled debris flow is assumed to have four regions where the impact rate and impulses are controlled by different mechanisms: the flow body, a coarser-grained snout, a snout lip where particles fall from the snout on the bed, and a dilute front composed of saltating particles. We calculate the seismic power produced by this impact model in two end-member scenarios, a thin-flow and thick-flow limit, which assume that the ratio of grain sizes to flow thicknesses are either near unity or much less than unity. The thin-flow limit is more appropriate for boulder-rich flows that are most likely to generate large seismic signals. As a flow passes a seismic station, the rise phase of the seismic amplitude is generated primarily by the snout while the decay phase is generated first by the snout and then the main flow body. The lip and saltating front generate a negligible seismic signal. When ground properties are known, seismic power depends most strongly on both particle diameter and average flow speed cubed, and also depends on length and width of the flow. The effective particle diameter for producing seismic power is substantially higher than the median grain size and close to the 73rd percentile for a realistic grain size distribution. We discuss how the model can be used to estimate effective particle diameter and average flow speed from an integrated measure of seismic power. (c) 2019 The Authors. Earth Surface Processes and Landforms Published by John Wiley & Sons Ltd.
机译：我们提出了一种用于高频（> 1 Hz）光谱分布的物理模型，由碎片流动产生的地震功率。假设建模的碎片流动有四个区域，其中冲击率和冲动由不同的机制控制：流体，粗糙的鼻子，颗粒从床上的鼻子落下的鼻子唇部，并且组成稀释前部盐酸颗粒。我们计算在两个最终成员场景中的这种冲击模型产生的地震功率，缩小流动和厚流量限制，这假设晶粒尺寸与流动厚度的比率在统一附近或远远小于单位。薄流量更适合最有可能产生大地震信号的富沸石的流量。随着流动的流动，震动幅度的上升阶段主要由鼻子产生，而衰减阶段首先由鼻子产生，然后是主流体。唇缘和盐酸术前线产生可忽略不计的地震信号。当已知地面性质时，地震功率最强大地取决于粒径和平均流速立方体，并且还取决于流动的长度和宽度。用于产生地震功率的有效粒径基本上高于中值晶粒尺寸，并且靠近逼真的晶粒尺寸分布的73百分位。我们讨论模型如何用于估计从地震功率的综合测量来估计有效的粒径和平均流速。 （c）2019年作者。 John Wiley＆Sons Ltd.出版的地球表面流程和地貌

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