Broadband Seismological Observations of Aftershocks of the September 16, 2015 Mw 8.3 Illapel Earthquake, Chile

PI建议在智利Mw8.3 Illapel地震的破裂带部署20个宽带地震台站，为期一年。这些仪器将能够定位和描述大地震的数千次余震。这些数据可用于更好地了解纳斯卡-南美洲板块界面以及巨型逆冲断层破裂和震后活动背后的过程。在地震发生后立即捕捉高地震活动率的能力将使俯冲结构的图像更加清晰，并提高我们对该地区地震危险性的理解。2015年智利伊亚佩尔地震后发生的强烈余震系列为研究相邻的巨型逆冲断层所描绘的俯冲带分段提供了难得的机会。虽然余震的地震活动率很高，但研究人员可以利用这一优势来照亮纳斯卡和南美洲的板间界面，寻找从余震位置和特征（如震源机制、滑动速度、频谱和衰减特征）中可辨别的滑动状态差异的证据。这一部署将产生一个高质量、开放获取的数据集，将捕捉有时间限制的现象。

The PIs proposed to deploy 20 broadband seismic stations for one year in the rupture zone of the Mw 8.3 Illapel, Chile earthquake. The instruments will enable locating and characterizing thousands of aftershocks from the large earthquake. This data can be used to better understand the Nazca-South America plate interface as well as the processes behind the megathrust rupture and postseismic activity. The ability to capture the high seismicity rate immediately after the earthquake will enable both a finer picture of the subduction structure, as well improve our understanding of seismic hazard in the region. The vigorous aftershock series now occurring in the wake of the 2015 Illapel, Chile Earthquake provides a rare opportunity to study syuduction zone segmentation, as delineated by adjacent megathrust ruptures. While the aftershock seismicity rate is high, researchers can take advantage to illuminate the Nazca and South American interplate interface, looking for evidence of differences in slip regime as discernible from aftershock locations and characteristics such as focal mechanisms, slip speed and spectral and attenuation characteristics. The deployment will produce a high quality, open access data set that will capture time-limited phenomena.