The elusive transition toward afterslip following an earthquake is challenging to capture with typical data resolution limits. A dense geodetic network recorded the Mw 7.1 Ridgecrest earthquake, including 16 Global Navigation Satellite System (GNSS) stations and 3 borehole strainmeters (BSM). The sub-nanostrain precision and sub-second sampling rate of BSMs bridges a gap between conventional seismologic and geodetic methods, exemplified by atypical postseismic shear strain reversals observed at nearfield (<2 km) station B921 that remain unexplained. We jointly invert GNSS displacements and BSM strains for coseismic and postseismic slip spanning hours to months over 7 independent periods. Cosiesmically, our model resolves the largest slip magnitudes of up to 6.6 m on the mainshock rupture plane, with similar patterns to other inferred slip distributions. The foreshock fault appears to slip coincidently with mainshock, revealing potential asperities activated during the preceding Mw 6.4 event. Postseismically, the best-fitting models adhere to mechanical rate-and-state expectations of logarithmically decaying slip adjacent to the coseismic rupture terminus, and where deep rheologic conditions favor creep. Most spatial variation occurs in the early postseismic timeframe (<1–2 weeks), with evidence for regional rheologic control and static stress dependence. Triggered creep on the neighboring Garlock Fault unexpectedly persists for >178 days—further highlighting the importance of fault networks in postseismic stress redistribution, critical to assessing future hazard.

中文翻译：

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速率相关框架中的余滑和蠕变：Mw 7.1 Ridgecrest 地震的钻孔应变和 GNSS 位移的联合反演


地震后难以捉摸的向余滑过渡在典型的数据分辨率限制下很难捕获。密集的大地测量网络记录了 Mw 7.1 Ridgecrest 地震，包括 16 个全球导航卫星系统 （GNSS） 站和 3 个钻孔应变仪 （BSM）。BSM 的亚纳应变精度和亚秒采样率弥合了传统地震学和大地测量方法之间的差距，例如在近场 （<2 km） 站 B921 观察到的非典型地震后剪切应变反转，该变化仍未得到解释。我们联合反演 GNSS 位移和 BSM 应变，用于 7 个独立周期内跨越数小时至数月的同震和震后滑移。从整体上讲，我们的模型解析了主震破裂平面上高达 6.6 m 的最大滑移幅度，其模式与其他推断的滑移分布相似。前震断层似乎与主震同时滑动，揭示了在之前的 Mw 6.4 事件中激活的潜在凹凸。在地震后，最佳拟合模型遵循对数衰减滑移的机械速率和状态期望，即在同震断裂末端附近，并且深层流变条件有利于蠕变。大多数空间变化发生在地震后早期时间框架（<1-2 周），有证据表明区域流变控制和静态应力依赖性。邻近的 Garlock 断层上触发的蠕变意外持续了 >178 天——进一步突出了断层网络在地震后应力再分布中的重要性，这对于评估未来的危险至关重要。