Map Sheet 48 (2025 update) - Preferred Slip Rate Values on Major Faults in California

This map shows fault-based earthquake sources and their preferred slip rates used in the USGS 2023 conterminous U.S. time-independent earthquake rupture forecast model, which provides authoritative estimates of the magnitude, location, and time-averaged frequency of potentially damaging earthquakes in California. Fault model slip rates are given in millimeters per year. The shapefile depicts the surface traces of modeled faults, which are simplified from the CGS USGS Quaternary Fault and Fold database (https://www.usgs.gov/programs/earthquake-hazards/faults/). For modeled blind fault seismic sources, the traces represent the map-view fault tip projection of the subsurface fault. For additional information regarding modeled faults please refer to Hatem et al. (2022).本地图展示了美国地质调查局（United States Geological Survey, USGS）2023年美国本土时间独立式地震破裂预测模型中所采用的基于断层的地震震源及其优选滑动速率。该模型可对加利福尼亚州境内具有潜在破坏性的地震的震级、发生位置以及时间平均发生频次提供权威估算结果。断层模型的滑动速率单位为毫米每年。该形状文件（shapefile）描绘了建模断层的地表迹线，这些迹线源自并简化自加州地质调查局（California Geological Survey, CGS）与美国地质调查局联合发布的第四纪断层与褶皱数据库（https://www.usgs.gov/programs/earthquake-hazards/faults/）。对于建模的隐伏断层地震震源而言，其迹线代表地下断层在地图视角下的断层尖端投影。若需了解建模断层的更多相关信息，请参阅Hatem等人（2022）的研究成果。