We analyzed continuous GPS data collected from 2002–2020 to characterize slow slip events (SSEs) in and near the Nicoya Peninsula, Costa Rica. These data are bisected by the 5 September 2012 M_w 7.6 earthquake. The displacement time series contain multiple signals, including plate convergence, plate interface locking, coseismic and postseismic deformation, seasonal oscillations, SSEs, and noise. GPS‐measured coseismic and postseismic displacements associated with the M_w 7.6 earthquake are modeled and removed by a step function plus multiple timescale relaxation processes with four characteristic times: 11, 94, 470, and 1,865 days. Seasonal oscillations are eliminated using a multichannel singular spectrum analysis (M‐SSA). Ten major SSEs (M_w > 6.6) are observed in the remaining time series, with a constant recurrence interval of 21.7 ± 2.6 months. SSEs occur in both shallow (~10 km) and deep (~35 km) portions of the plate interface, but the latter last longer and have larger magnitudes. There is minimum to no slow slip in the M_w 7.6 seismic rupture area and a persistent slow slip patch beneath the Nicoya Gulf entrance. Despite strong earthquake‐related stress perturbations, the inter‐SSE locking status on the megathrust is very similar between the late and early stages of the earthquake cycle and includes locked patches that ruptured in the 2012 earthquake or continue to rupture via SSEs. Some locked patches offshore south of the Nicoya Peninsula did not rupture in 2012, do not participate in SSEs, and may be indicative of supercycle behavior, that is, strain accumulation over several seismic cycles. These areas warrant heightened monitoring.

中文翻译：

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地震周期早期和晚期对尼古亚巨型推力的缓慢滑动和瞬变锁定

我们分析了2002-2020年收集的连续GPS数据，以表征哥斯达黎加尼科亚半岛及其附近的慢滑事件（SSE）。这些数据是由2012年9月5日一分为二中号_W¯¯ 7.6级大地震。位移时间序列包含多个信号，包括板块收敛，板块界面锁定，同震和震后变形，季节性振荡，SSE和噪声。GPS测量与相关同震和震后位移中号_瓦特7.6地震建模和除去由阶梯函数加上多个时间尺度弛豫过程有四个特征时间：11，94，470，和1865天。使用多通道奇异频谱分析（M-SSA）可以消除季节性振荡。十大SSE（M 在剩余的时间序列中观察到_w > 6.6），恒定的复发间隔为21.7±2.6个月。SSEs发生在板块界面的浅（约10 km）和深（约35 km）部分，但后者持续时间更长，幅度更大。M _w最小到没有慢滑7.6地震破裂区和Nicoya海湾入口下方的持续缓慢滑动斑块。尽管发生了与地震有关的强烈应力扰动，但在地震周期的晚期和早期，大推力上的SSE间锁定状态非常相似，其中包括在2012年地震中破裂或继续通过SSE破裂的锁定斑块。尼科亚半岛以南的一些锁定斑块在2012年没有破裂，没有参与SSE，并且可能表明超循环行为，即在几个地震循环中的应变累积。这些区域需要加强监控。