Costa Rica is a seismically active region located in a subduction zone. Combining earthquake data from the National Seismological Network and several Central American catalogs from 1522 to 2020, we present a new estimation for the Gutenberg-Richter relationship. The seismic catalog compiled with ~122,000 earthquakes was studied by calculating the magnitude of completeness (Mc) and by applying a space-time window declustering method. The residual catalog and a previously proposed seismic zonation were used to determine the b-value, the maximum magnitude (Mmax), and the mean recurrence interval (MRI). Our results show a temporal and geographic variation in the Mc, decreasing from 7.0 since 1793 to 3.0 since 1995, and with the lowest estimate (2.5) in Central Costa Rica. The b-values of 0.85 for the entire catalog and ~0.83 for the interplate zones, are similar to other regions worldwide with young subducting slabs. There is a general trend of higher and more variable b-values among the upper-plate (average 0.90) and intraslab (1.14) zones as compared to the interplate regions (0.85). The upper-plate variability is explained in terms of the diversity in geological units and faulting style, whereas in the interplate and the subducting slab is connected to the stress level imposed by different seafloor morphologies and hydration states along the margin. Our data suggest a seismic potential of moment magnitude (Mw) 7.9–8.0 for the Nicoya and Southern Nicaragua interplate zones and for the Limon region. The Gutenberg-Richter distribution shows that a Mw 7.0 has a longer MRI for the intraslab zones (~72 years) than for the subduction interplate region (~15 years) and plate and microplate boundaries (~40–45 years). Interplate earthquakes have occurred recently (1991 Mw 7.7 and 2012 Mw 7.6) but no major intraslab since 1948 (Mw 7.0).

哥斯达黎加是一个地震活跃区，位于俯冲带。结合来自国家地震网的地震数据和 1522 年至 2020 年的几个中美洲目录，我们提出了对古腾堡-里希特关系的新估计。通过计算完整性震级 (Mc) 和应用时空窗口去聚类方法，研究了由 ~122,000 次地震编制的地震目录。残差目录和先前提出的地震分区用于确定b值、最大震级 (Mmax) 和平均复发间隔 (MRI)。我们的结果显示 Mc 的时间和地理变化，从 1793 年以来的 7.0 下降到 1995 年以来的 3.0，并且在哥斯达黎加中部的估计值最低 (2.5)。在b- 整个目录的值为 0.85，板间带的值为 ~0.83，与全球其他具有年轻俯冲板块的地区相似。总体趋势是b变高变多与板间区域 (0.85) 相比，上板 (平均 0.90) 和板内 (1.14) 区域之间的值。上板块的变异性可以从地质单元和断层类型的多样性来解释，而在板间和俯冲板片中，则与沿边缘不同海底形态和水化状态施加的应力水平有关。我们的数据表明尼科亚和尼加拉瓜南部的板间带以及利蒙地区的地震潜在震级 (Mw) 为 7.9-8.0。Gutenberg-Richter 分布表明，Mw 7.0 对板内带（~72 年）的 MRI 比对俯冲板间区域（~15 年）以及板块和微板块边界（~40-45 年）具有更长的 MRI。最近发生了板间地震（1991 Mw 7.7 和 2012 Mw 7.