Geologic gas storage is a sustainable strategy to store energy in underground reservoirs in order to be used under demand. Injection and withdrawal gas operations could trigger induced seismicity according to the tectonic constrains of the reservoir. The study of the active stress/strain fields shows the properties of the fault patterns that can be involved in induced seismicity. In our work, we have determined the strain/stress field in the Yela underground gas storage, an Upper Cretaceous carbonate reservoir located in central Spain. Slickensides on fault planes were measured from Cretaceous, Miocene and Quaternary rocks. Results show a strain field with e_y (maximum horizontal shortening) oriented NW-SE. This field was compressional during the early Miocene, switching off to extensional from late Miocene to present-day. Our results suggest that NNW-SSE and NW-SE oriented faults could act as an effective pathway for gas leakage and prone to trigger induced seismicity. Moreover, 141 small earthquakes (M_max 2.3) were recorded during underground operations in Yela. Peaks of earthquakes appear seasonally from November to February, in coincidence with the injection operations prior to the winter withdrawal. Working at its maximum gas storage volume, earthquake peaks decreased in intensity and magnitude from 2017 to 2021, and show a time lag of 3 months from the month of maximum volume injection to the earthquake occurrence.

地质储气库是将能源储存在地下储层中以便在需求下使用的可持续战略。根据储层的构造约束，注采气作业可能引发诱发地震活动。对活动应力/应变场的研究显示了可能与诱发地震活动有关的断层模式的特性。在我们的工作中，我们确定了位于西班牙中部的上白垩统碳酸盐储层 Yela 地下储气库中的应变/应力场。从白垩纪、中新世和第四纪岩石测量断层面上的滑面。结果显示带有_{y的应变场}（最大水平缩短）面向 NW-SE。该场在早中新世期间是压缩的，从晚中新世到现在转变为拉伸场。我们的研究结果表明，NNW-SSE 和 NW-SE 方向的断层可以作为气体泄漏的有效途径，并且容易引发诱发地震。此外，在耶拉地下作业期间记录了141 次小地震（M _{max 2.3）。}11 月至 2 月季节性地出现地震高峰，这与冬季撤离前的注入作业相吻合。2017年至2021年，在其最大储气量下，地震峰值强度和震级呈下降趋势，从最大储气量到发生地震有3个月的时间滞后。