本文件包含定义海洋结构物抗震设计程序和标准的要求；有关要求的指南包含在附录A中。这些要求侧重于固定钢海洋结构物和固定混凝土海洋结构物。简要讨论了地震事件对浮式结构物和部分浮式结构物的影响。本文件仅在要求适用的范围内涵盖高架条件下自升式平台的现场特定评估。 仅详细讨论了地震引起的地面运动。还提到并简要讨论了液化、边坡失稳、断层、海啸、泥火山和冲击波等其他地质诱发灾害。 这些要求旨在将人员、环境和资产的风险降至合理可行的最低水平。这一目的是通过使用: a） 地震设计程序取决于海洋结构物的暴露水平和地震事件的预期强度； b） 两级抗震设计检查，其中结构的强度和刚度设计为极限状态（ULS），然后检查异常环境事件或异常极限状态（ALS），以确保其满足储备强度和能量耗散要求。 针对高地震区和/或高暴露水平的海洋结构物，提出了现场特定概率地震危险性分析（PSHA）的程序和要求。 然而，不包括对PSHA程序的全面解释。 在允许简化设计方法的情况下，附录B中包含的全球海上地图显示了对应于1000年重现期的地面震动强度。在这种情况下，这些地图可以与相应的比例因子一起使用，以确定结构设计的适当地震作用，除非当地规范或现场特定研究提供了更详细的信息。 注:对于固定式钢海洋结构物的设计，ISO 19902中包含了设计参数的进一步具体要求和建议值（例如部分作用系数和阻力系数），而固定式混凝土海洋结构物的要求和建议值包含在ISO 19903中。ISO 19904中包含浮式结构的抗震要求，ISO 19905系列中针对自升式平台和其他MOU的现场特定评估，ISO 19906中针对北极结构的抗震要求，以及ISO 19901-3中针对上部结构的抗震要求。

This document contains requirements for defining the seismic design procedures and criteria for offshore structures; guidance on the requirements is included in Annex A. The requirements focus on fixed steel offshore structures and fixed concrete offshore structures. The effects of seismic events on floating structures and partially buoyant structures are briefly discussed. The site-specific assessment of jack-ups in elevated condition is only covered in this document to the extent that the requirements are applicable. Only earthquake-induced ground motions are addressed in detail. Other geologically induced hazards such as liquefaction, slope instability, faults, tsunamis, mud volcanoes and shock waves are mentioned and briefly discussed. The requirements are intended to reduce risks to persons, the environment, and assets to the lowest levels that are reasonably practicable. This intent is achieved by using: a) seismic design procedures which are dependent on the exposure level of the offshore structure and the expected intensity of seismic events; b) a two-level seismic design check in which the structure is designed to the ultimate limit state (ULS) for strength and stiffness and then checked to abnormal environmental events or the abnormal limit state (ALS) to ensure that it meets reserve strength and energy dissipation requirements. Procedures and requirements for a site-specific probabilistic seismic hazard analysis (PSHA) are addressed for offshore structures in high seismic areas and/or with high exposure levels. However, a thorough explanation of PSHA procedures is not included. Where a simplified design approach is allowed, worldwide offshore maps, which are included in Annex B, show the intensity of ground shaking corresponding to a return period of 1 000 years. In such cases, these maps can be used with corresponding scale factors to determine appropriate seismic actions for the design of a structure, unless more detailed information is available from local code or site-specific study. NOTE      For design of fixed steel offshore structures, further specific requirements and recommended values of design parameters (e.g. partial action and resistance factors) are included in ISO 19902, while those for fixed concrete offshore structures are contained in ISO 19903. Seismic requirements for floating structures are contained in ISO 19904, for site-specific assessment of jack-ups and other MOUs in the ISO 19905 series, for arctic structures in ISO 19906 and for topsides structures in ISO 19901‑3.