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

2015年9月16日智利伊拉佩尔8.3级地震余震宽带地震观测

• 批准号: 1600890
• 负责人: Raymond Russo
• 金额: $ 10万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-12-01 至 2017-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1600890&HistoricalAwards=false
• 关键词: Broadband; Seismological; Observations; Aftershocks; September

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.

PI 提议在智利 8.3 级伊拉佩尔地震的破裂带部署 20 个宽带地震台，为期一年。这些仪器将能够定位和表征大地震中的数千次余震。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。地震发生后立即捕获高地震活动率的能力将使我们能够更详细地了解俯冲结构，并提高我们对该地区地震危险性的了解。 2015 年智利伊拉佩尔地震之后发生的强烈余震系列为研究由邻近的巨型逆冲断裂所界定的造山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照亮纳斯卡和南美板间界面的机会，寻找可从余震位置和震源机制、滑移速度以及光谱和衰减特征等特征中辨别的滑移区差异的证据。该部署将产生高质量、开放访问的数据集，该数据集将捕获有时限的现象。