Recent Earthquakes - Classic USGS Rendering

Our Recent Earthquakes - Live Feed Service updated with the new "Feature Display Order" capability, now available when using the new Map Viewer. Allowing it to render features based on the Magnitude Order for Quake Events, and Intensity Order for Shakemap features. This brings attention to critical events and greatly improves Feature visibility! 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 Revisions Jul 11, 2024: Updated event popup, setting "Tsunami Warning" text to "Alert Possible" when flag is present. Also included hyperlink to tsunami warning center. 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!「近期地震实时推送服务」已新增「要素显示排序」功能，目前可在新版地图查看器中使用。该功能可根据地震事件的震级对要素进行排序，同时针对震动图（Shakemap）要素按烈度排序，能够突出显示重要地震事件，大幅提升要素可视性！ 除按震级展示地震信息外，本服务还提供地震影响详情：影响程度通过受影响人口、经济损失模型与人员伤亡估算模型进行评估。如需了解更多细节，请参阅：PAGER（全球地震响应快速评估，Prompt Assessment of Global Earthquakes for Response）预警信息。 使用最佳实践：本服务使用量极高，为确保地图与应用在峰值时段的性能与可访问性，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/时间筛选地震事件，建议使用内置的「时长（Age）」字段：该字段记录了自记录创建或上次修改至上次服务更新的天数或小时数。此类查询完全支持缓存响应，可在高流量服务环境中高效向用户返回常用查询结果。在应用中接入本服务时，请尽量避免使用POST请求：此类请求无法缓存，在高流量时段可能会影响服务性能与可扩展性。 更新频率：地震事件更新频率最高可达每5分钟一次，数据留存时长通常为30天，但以下情况除外： - 震级低于4.5的事件仅留存7天； - 「重要性（Significance）」字段（sig）数值≥600的事件留存90天。 除地震事件点位外，本服务还提供震动图（Shakemap）要素：此类要素已按震动烈度进行聚合，以降低图层复杂度。本服务提供的所有图层均支持时间启用功能，具体包括： 1. 按震级分类的地震事件：包含地震的震级数值。 - 包含PAGER预警等级：美国地质调查局（USGS，United States Geological Survey）的PAGER（全球地震响应快速评估系统）可自动分配影响等级，用于估算人员伤亡与经济损失。 - 包含重要性等级：事件的重要性由震级、最大麦加利烈度（MMI，Modified Mercalli Intensity）、「有感报告」及估算影响等因素决定。 2. 震动烈度：对应可用地震事件的仪器烈度或修正麦加利烈度（MMI）。 如需了解字段术语与技术细节，请参阅：ComCat文档。 2024年7月11日更新内容：优化了事件弹窗，当存在海啸预警标记时，将原「海啸预警」文本更新为「可能存在预警」，同时新增了指向海啸预警中心的超链接。 本地图仅用于提供信息参考，不会全天候监控其准确性与时效性。如需获取官方指导，请始终以美国地质调查局（USGS）的原始来源为准。若您希望接收潜在问题警报或了解本服务的下次更新时间，请访问我们的实时推送服务状态页面！