Recent Earthquakes

In addition to displaying earthquakes by magnitude, this service also provide earthquake impact details. Impact is measured by population as well as models for economic and fatality loss. For more details, see: PAGER Alerts. Consumption Best Practices: As a service that is subject to very high usage, ensure peak performance and accessibility of your maps and apps by avoiding the use of non-cache-able relative Date/Time field filters. To accommodate filtering events by Date/Time, we suggest using the included "Age" fields that maintain the number of days or hours since a record was created or last modified, compared to the last service update. These queries fully support the ability to cache a response, allowing common query results to be efficiently provided to users in a high demand service environment. When ingesting this service in your applications, avoid using POST requests whenever possible. These requests can compromise performance and scalability during periods of high usage because they too are not cache-able. Update Frequency: Events are updated as frequently as every 5 minutes and are available up to 30 days with the following exceptions: Events with a Magnitude LESS than 4.5 are retained for 7 days Events with a Significance value, "sig" field, of 600 or higher are retained for 90 days In addition to event points, ShakeMaps are also provided. These have been dissolved by Shake Intensity to reduce the Layer Complexity. The specific layers provided in this service have been Time Enabled and include: Events by Magnitude: The event’s seismic magnitude value. Contains PAGER Alert Level: USGS PAGER (Prompt Assessment of Global Earthquakes for Response) system provides an automated impact level assignment that estimates fatality and economic loss. Contains Significance Level: An event’s significance is determined by factors like magnitude, max MMI, ‘felt’ reports, and estimated impact. Shake Intensity: The Instrumental Intensity or Modified Mercalli Intensity (MMI) for available events. For field terms and technical details, see: ComCat Documentation Alternate Symbologies Visit the Classic USGS Feature Layer item for a Rainbow view of Shakemap features. Revisions Dec 22, 2025: Added ‘Hours Old’ field to Shake Intensity layer. Sep 16, 2025: Exposed ‘UniqueId’ field in Shake Intensity Polygon layer. Sep 14, 2025: Upgrade to Layer data update workflow, to improve reliability and scalability. Aug 14, 2024: Added a default Minimum scale suppression of 1:6,000,000 on Shake Intensity layer. Jul 11, 2024: Updated event popup, setting "Tsunami Warning" text to "Alert Possible" when flag is present. Also included hyperlink to tsunami warning center. Feb 13, 2024: Updated feed logic to remove Superseded events This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency. Always refer to USGS source for official guidance. If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our Live Feed Status Page!

本服务除可按震级展示地震事件外，还提供地震影响详情。影响程度通过人口数据，以及经济损失与人员伤亡估算模型进行衡量。如需了解更多细节，请参阅：PAGER警报（PAGER Alerts）。
服务使用最佳实践：本服务流量极高，为保障您的地图与应用程序的峰值性能与可访问性，请避免使用无法缓存的相对日期/时间字段过滤器。若需按日期/时间筛选事件，我们建议使用内置的“Age”字段——该字段会记录自记录创建或上次修改至服务上次更新的天数或小时数。此类查询完全支持响应缓存，可在高流量服务环境中高效向用户返回常用查询结果。在应用程序中接入本服务时，请尽量避免使用POST请求。在高流量时段，POST请求无法被缓存，可能会损害服务性能与可扩展性。
更新频率：地震事件每5分钟更新一次，数据保留时长最长为30天，以下情况除外：震级小于4.5的事件仅保留7天；显著性值（sig字段）达到600及以上的事件保留90天。
除事件点位外，本服务还提供震动烈度图（ShakeMaps）。为降低图层复杂度，该图已按震动烈度进行聚合。本服务提供的特定图层已启用时间功能，具体包括：
1. 按震级分类的事件：展示事件的地震震级数值。
2. 包含PAGER警报等级：美国地质调查局（USGS）PAGER（全球地震响应快速评估，Prompt Assessment of Global Earthquakes for Response）系统会自动分配影响等级，用于估算人员伤亡与经济损失。
3. 包含显著性等级：事件的显著性由震级、最大仪器烈度（MMI）、“震感报告”及估算影响程度等因素决定。
4. 震动烈度（Shake Intensity）：可用事件的仪器烈度或修订麦加利烈度（Modified Mercalli Intensity，MMI）。
如需了解字段术语与技术细节，请参阅：ComCat文档（ComCat Documentation）。
替代符号体系：请访问经典美国地质调查局要素图层页面，以查看震动烈度图要素的彩虹配色视图。
更新记录
2025年12月22日：在震动烈度图层中新增“震龄小时数（Hours Old）”字段。
2025年9月16日：在震动烈度多边形图层中开放“唯一标识符（UniqueId）”字段。
2025年9月14日：升级图层数据更新工作流，以提升可靠性与可扩展性。
2024年8月14日：为震动烈度图层新增默认的1:6,000,000最小比例尺压制规则。
2024年7月11日：更新事件弹窗，当存在对应标记时，将“海啸警报”文本修改为“可能发布警报”，并新增海啸预警中心的超链接。
2024年2月13日：更新数据源逻辑，移除已被取代的事件。
本地图仅用于信息展示，不会全天候监控其准确性与时效性。如需获取官方指导，请始终参考美国地质调查局（USGS）的原始数据源。若您希望接收潜在问题的警报，或仅需了解本服务的下次更新时间，请访问我们的实时服务状态页面！