A New Approach to Determining Long-Duration Slip of Large Earthquakes

小行星9526873 这项研究是利用大地震的地球环绕面波的叠加来消除沿路径沿着变化的速度结构的影响，并隔离地震的震源时间历史。 这种技术在140至550秒的表面波周期中最有效。 这些低频估计可以与来自体波建模的高频估计相结合，以产生对震源的宽带描述。 该技术将应用于自1977年以来数字记录的非常大的地震，以及一些特别感兴趣的早期事件，包括1989年的麦夸里岭地震，这是迄今为止难以理解的。 特别强调的是在地震发生前寻找长周期的逆断层滑动。 这项研究是国家地震减灾计划的一个组成部分。 ***

9526873 Nabelek This research is to use the stacking of globe-circling surface waves from very large earthquakes to eliminate the effects of varying velocity structure along the path and isolate the source time history of the earthquake. This technique is most effective in the surface-wave periods of 140 to 550 seconds. These low- frequency estimates can be combined with high-frequency estimates from body wave modeling to produce a broadband description of the earthquake source. The technique will be applied to very large earthquakes recorded digitially since 1977, and a select number of earlier events of special interest including the 1989 Macquarie Ridge earthquake which has been difficult to understand as yet. Special emphasis will be on the search for long-period precursory fault slip prior to the earthquake onset. This research is a component of the National Earthquake Hazard Reduction Program. ***