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地震破裂了厄瓜多尔海岸一段约130公里长、100公里宽的俯冲带，震级为7.8兆瓦。地震发生后，立即开展了协调一致的国际快速反应工作，部署了48台宽带和中期地震仪和10台海底地震仪，在断裂带和邻近断层段上方观测到了十年时间尺度上发生大地震和慢滑事件的地方。厄瓜多尔国家永久地震和大地测量网络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纳斯卡板块的俯冲和Pedernales地震和余震序列，将构造和地震性质的走向变化与所观察到的(地震前、同震和震后)滑动行为的分布联系起来，以确定慢滑和巨型逆冲破裂之间的关系。我们将综合各种宽带地震技术的分析，以检查在多个地震周期中大到大地震的凹凸体的持久性，凹凸体在促进或抑制破裂传播方面的作用，以及俯冲界面锁定部分和爬行部分之间的关系。

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.