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Dynamics of the Oso-Steelhead landslide from broadband seismic analysis

机译：基于宽带地震分析的Oso-Steelhead滑坡动力学

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We carry out a combined analysis of the short- and long-period seismic signals generated by the devastating Oso-Steelhead landslide that occurred on 22 March 2014. The seismic records show that the Oso-Steelhead landslide was not a single slope failure, but a succession of multiple failures distinguished by two major collapses that occurred approximately 3 min apart. The first generated long-period surface waves that were recorded at several proximal stations. We invert these long-period signals for the forces acting at the source, and obtain estimates of the first failure runout and kinematics, as well as its mass after calibration against the mass-centre displacement estimated from remote-sensing imagery. Short-period analysis of both events suggests that the source dynamics of the second event is more complex than the first. No distinct long-period surface waves were recorded for the second failure, which prevents inversion for its source parameters. However, by comparing the seismic energy of the short-period waves generated by both events we are able to estimate the volume of the second. Our analysis suggests that the volume of the second failure is about 15-30% of the total landslide volume, giving a total volume mobilized by the two events between 7 x 10(6) and 10 x 10(6) m(3), in agreement with estimates from ground observations and lidar mapping.
机译：我们对2014年3月22日发生的具破坏性的Oso-Steelhead滑坡产生的短期和长期地震信号进行了综合分析。地震记录显示，Oso-Steelhead滑坡不是单一的边坡破坏，而是一个连续的多个故障以两个主要的崩溃为特征，分别在大约3分钟内发生。第一个产生的长周期表面波记录在几个近端站。我们对这些长周期信号进行反演，以求作用于源头的力，并根据遥感影像估算的质量中心位移，对首次失效跳动和运动学以及其质量进行估算。对这两个事件的短期分析表明，第二个事件的源动态比第一个事件更复杂。对于第二次失败，没有记录到明显的长周期表面波，这可以防止其源参数发生反转。但是，通过比较两个事件产生的短周期地震波的能量，我们能够估算出第二个地震的体积。我们的分析表明，第二次破坏的体积约为滑坡总体积的15％至30％，从而使两次地震之间的总体积介于7 x 10（6）和10 x 10（6）m（3）之间，与地面观测和激光雷达测绘的估计一致。

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