NSFGEO-NERC: The Role of Asperities and Slow Slip in Subd. Zone Earthq. Rupture and Aftershock Sequ.: In sights from the 4/16/16 Pedernales Ecuador

NSFGEO-NERC：Subd 中粗糙度和慢滑移的作用。

• 批准号: NE/R010412/1
• 负责人: Andreas Rietbrock
• 金额: $ 26.17万
• 依托单位: University of Liverpool
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FR010412%2F1
• 关键词: NSFGEO; NERC; Role; Asperities; Slow

In April 2016, the Pedernales Earthquake ruptured an ~ 130 km long, 100 km wide segment of the subduction zone along the coast of Ecuador in a Mw 7.8 megathrust event. Immediately after the earthquake a coordinated international rapid response effort deployed 48 broadband and intermediate period seismometers and 10 ocean bottom seismometers above the rupture zone and adjacent fault segments where large earthquakes occur on decadal time scales and slow slip events have been observed.The seismic array is complemented by rapid response geodetic efforts and long term observations from permanent national seismic and geodetic networks in Ecuador. We will use subduction of the Nazca Plate beneath Ecuador and the Pedernales Earthquake and aftershock sequence to link along strike variations in structure and seismic properties to the distribution of slip behaviors observed (pre-, co- and post-seismic) to determine the relationship between slow slip and megathrust rupture. We will integrate analyses from a variety of broadband seismic techniques to examine the persistence of asperities for large to great earthquakes over multiple seismic cycles, the role of asperities in promoting or inhibiting rupture propagation, and the relationship between locked and creeping parts of the subduction interface.

2016 年 4 月，佩德纳莱斯地震导致厄瓜多尔海岸约 130 公里长、100 公里宽的俯冲带在一次 Mw 7.8 的巨型逆冲事件中破裂。地震发生后，国际协调快速响应工作立即在破裂带和邻近断层段上方部署了 48 个宽带和中周期地震仪以及 10 个海底地震仪，这些地方发生了数十年时间尺度的大地震，并观测到了慢滑移事件。地震台阵是并辅之以快速反应大地测量工作以及厄瓜多尔永久国家地震和大地测量网络的长期观测。我们将利用厄瓜多尔下方纳斯卡板块的俯冲以及佩德纳莱斯地震和余震序列，将结构和地震特性的沿走向变化与观察到的滑动行为的分布（震前、震中和震后）联系起来，以确定之间的关系缓慢滑移和巨型逆冲破裂。我们将整合各种宽带地震技术的分析，以研究多个地震周期中大地震中凹凸体的持续性、凹凸体在促进或抑制破裂传播中的作用，以及俯冲界面的锁定部分和蠕变部分之间的关​​系。

项目成果

1D-velocity structure and seismotectonics of the Ecuadorian margin inferred from the 2016 Mw7.8 Pedernales aftershock sequence

根据 2016 年 Mw7.8 Pedernales 余震序列推断的厄瓜多尔边缘一维速度结构和地震构造

• DOI: 10.1016/j.tecto.2019.228165
• 发表时间: 2019
• 期刊: Tectonophysics
• 影响因子: 2.9
• 作者: León-Ríos, Sergio;Agurto-Detzel, Hans;Rietbrock, Andreas;Alvarado, Alexandra;Beck, Susan;Charvis, Phillipe;Edwards, Benjamin;Font, Yvonne;Garth, Tom;Hoskins, Mariah
• 通讯作者: Hoskins, Mariah

Ridge subduction and afterslip control aftershock distribution of the 2016 Mw 7.8 Ecuador earthquake

2016年厄瓜多尔7.8级地震的山脊俯冲与后滑控制余震分布

• DOI: 10.1016/j.epsl.2019.05.029
• 发表时间: 2019
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Agurto-Detzel, H.;Font, Y.;Charvis, P.;Régnier, M.;Rietbrock, A.;Ambrois, D.;Paulatto, M.;Alvarado, A.;Beck, S.;Courboulex, F.
• 通讯作者: Courboulex, F.

The 2016 Mw 7.8 Pedernales, Ecuador, Earthquake: Rapid Response Deployment

2016 年厄瓜多尔 7.8 级佩德纳莱斯地震：快速响应部署

• DOI: 10.1785/0220180364
• 发表时间: 2019
• 期刊: Seismological Research Letters
• 影响因子: 3.3
• 作者: Meltzer, Anne;Beck, Susan;Ruiz, Mario;Hoskins, Mariah;Soto‐Cordero, Lillian;Stachnik, Joshua C.;Lynner, Colton;Porritt, Rob;Portner, Daniel;Alvarado, Alexandra
• 通讯作者: Alvarado, Alexandra

Convolutional Neural Network for Seismic Phase Classification, Performance Demonstration over a Local Seismic Network

• DOI: 10.1785/0220180312
• 发表时间: 2019-01
• 期刊: Seismological Research Letters
• 影响因子: 3.3
• 作者: J. Woollam;A. Rietbrock;Ángel Bueno;S. Angelis