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

2016年4月，Pedernales地震在厄瓜多尔海岸发生了7.8兆瓦的特大逆冲断层，导致130公里长、100公里宽的俯冲带断裂。地震发生后，国际快速反应协调工作立即在断裂带和相邻断层段上方部署了48个宽带和中期地震仪和10个海底地震仪，这些断裂带和相邻断层段每十年发生一次大地震，并观察到慢滑事件。厄瓜多尔永久国家地震和大地测量网的快速反应大地测量工作和长期观测补充了地震阵列。我们将利用厄瓜多尔下方纳斯卡板块的俯冲作用和Pedernales地震和余震序列，将沿走向的结构和地震特性变化与观测到的滑动行为分布（地震前、地震中和地震后）联系起来，以确定慢滑和大逆冲断裂之间的关系。我们将整合各种宽带地震技术的分析，以检查多个地震周期中大地震到大地震的凸起的持久性，凸起在促进或抑制破裂传播方面的作用，以及俯冲界面的锁定部分和蠕动部分之间的关系。

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.