Rapid deployment of a seismic array in Ecuador following the April 16th 2016 M7.8 Pedernales earthquake

2016 年 4 月 16 日 M7.8 佩德纳莱斯地震后，厄瓜多尔快速部署地震台阵

• 批准号: NE/P008828/1
• 负责人: Benjamin Edwards
• 金额: $ 6.67万
• 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: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FP008828%2F1
• 关键词: Rapid; deployment; seismic; array; Ecuador

This project will rapidly deploy a seismological network at the southern end of the April 16th 2016 M7.8 Pedernales earthquake in Ecuador (Objective 1). Our project partners are currently deploying seismological stations in the central (GEOAZURE, IRD, France) and northern (IRIS, USA) regions of the fault zone. The seismological network will record earthquake activity continuously for a period of 10 months, with a service after 5 months. The dataset obtained, which will be openly shared among our project partners and the scientific community will provide unprecedented resolution on imaging aftershock activity on the subduction interface. Once collected after 5 and 10 months, the continuous data will be processed to detect earthquakes which will be located while jointly determining high-resolution 3D velocity structure in this tectonically complex subduction zone. By interpreting the spatial and temporal distribution and migration of aftershock activity we will gain valuable insight into the stress conditions at the subduction interface. Additional analysis of attenuation that the seismic waves have undergone will, when jointly interpreted with the P-wave and S-wave velocity structure, will provide information as to the chemical and mineralogical nature of the subduction zone and processes. In order to interpret the seismological data in terms of the stress and strain changes that have taken place before, during and after the M7.8 earthquake, we will use satellite interferometry to determine, for the first time, a multi-temporal InSAR time series (Objective 2). This will be done by processing multiple satellite images of the zone, from 6 months before to 12 months after the earthquake. From these images we can ascertain the ground deformation. The data collected will allow us to bring together interdisciplinary information to interpret the state of stress and its evolution in this poorly studied and instrumented part of the world. Finally, using all data and interpretations gathered we will address the question of whether the southern region of the fault zone is likely to rupture, and what the likely response of nearby volcanic zones will be to changes in the regional stress field.

该项目将在2016年4月16日M7.8 Pedernales地震（目标1）的南端迅速部署地震网络。我们的项目合作伙伴目前正在中央（Geoazure，IRD，法国）和断层区域的北部（IRIS）地区部署地震台。地震网络将连续记录地震活动10个月，并在5个月后提供服务。获得的数据集将在我们的项目合作伙伴中公开共享，科学界将在俯冲界面上提供前所未有的成像余震活动的分辨率。一旦在5个月和10个月后收集，将处理连续数据以检测将位于地震的同时，同时在该构造复杂的俯冲区中共同确定高分辨率3D速度结构。通过解释余震活性的空间和时间分布以及迁移，我们将对俯冲界面处的应力条件有宝贵的见解。对衰减的进一步分析，即在用P波和S波速度结构共同解释地震波的衰减将提供有关俯冲带和过程的化学和矿物学性质的信息。为了解释在M7.8地震之前，之中和之后发生的压力和应变变化的地震学数据，我们将使用卫星干涉法来确定首次确定多个颞ISAR时间序列（目标2）。这将通过处理地震前6个月至12个月的多个区域的卫星图像来完成。从这些图像中，我们可以确定地面变形。收集到的数据将使我们能够将跨学科信息汇总在一起，以解释压力状态及其在世界上研究不佳和工具的一部分中的发展。最后，使用收集的所有数据和解释，我们将解决断层区南部地区是否可能破裂的问题，以及附近火山区域对区域应力场变化的可能反应。

项目成果

An Improved Phase Filter for Differential SAR Interferometry Based on an Iterative Method

• DOI: 10.1109/tgrs.2018.2820725
• 发表时间: 2018-04
• 期刊: IEEE Transactions on Geoscience and Remote Sensing
• 影响因子: 8.2
• 作者: Alejandro Mestre-Quereda;J. Lopez-Sanchez;J. Selva;P. González

3D Local Earthquake Tomography of the Ecuadorian Margin in the Source Area of the 2016 Mw 7.8 Pedernales Earthquake

2016 年 Mw 7.8 佩德纳莱斯地震震源区厄瓜多尔边缘的 3D 局部地震层析成像

• DOI: 10.1029/2020jb020701
• 发表时间: 2021
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: León‐Ríos, Sergio;Bie, Lidong;Agurto‐Detzel, Hans;Rietbrock, Andreas;Galve, Audrey;Alvarado, Alexandra;Beck, Susan;Charvis, Philippe;Font, Yvonne;Hidalgo, Silvana
• 通讯作者: Hidalgo, Silvana

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