As ShakeAlert, the earthquake early warning system for the West Coast of the U.S., begins its transition to operational public alerting, we explore how post-alert messaging might represent system performance. Planned post-alert messaging can provide timely, crucial information to both emergency managers and ShakeAlert operators as well as calibrate expectations among various publics or public user groups and inform their responses to future alerts. There is a concern among the scientists and emergency managers that false alerts may negatively impact trust in the system, so quickly disseminated post-alert messages are necessary. For a new early warning system, such as ShakeAlert, this is particularly relevant given that the potentially affected population is likely to be unfamiliar with this system. We address this concern in six steps: (1) assessment of ShakeAlert performance to date, (2) characterization of human behavior and response to earthquake alerts, (3) presentation of a decision tree for issuing post-alert messages, (4) design of a critical set of post-alert messaging scenarios, (5) elaboration of these scenarios with message templates for a variety of communication channels, and (6) development of a typology of earthquake alerts. We further explore methods for monitoring and evaluating ShakeAlert post-alert messaging, for continuous improvement to the system.

随着美国西海岸地震预警系统ShakeAlert开始向公共警报业务过渡，我们探索了警报后消息如何代表系统性能。计划好的警报后消息传递可以为紧急情况管理者和ShakeAlert操作员提供及时，关键的信息，并在各种公众或公共用户群体中校准期望，并告知他们对未来警报的响应。科学家和紧急情况管理人员之间存在一个担忧，那就是虚假警报可能会对系统中的信任产生负面影响，因此必须迅速发布警报后消息。对于诸如ShakeAlert之类的新的预警系统，这特别重要，因为潜在受影响的人群可能不熟悉该系统。我们通过六个步骤解决此问题：（1）评估ShakeAlert迄今为止的性能，（2）表征人类行为和对地震警报的响应，（3）展示发布警报后消息的决策树，（4）设计关键的警报后集消息情景，（5）使用各种通信渠道的消息模板对这些情景进行详细说明，以及（6）地震预警类型的发展。我们进一步探索监视和评估ShakeAlert警报后消息传递的方法，以对系统进行持续改进。（5）使用各种通讯渠道的消息模板来详细说明这些情况，以及（6）地震预警类型的发展。我们进一步探索监视和评估ShakeAlert警报后消息传递的方法，以对系统进行持续改进。（5）使用各种通讯渠道的消息模板来详细说明这些情况，以及（6）地震预警类型的发展。我们进一步探索监视和评估ShakeAlert警报后消息传递的方法，以对系统进行持续改进。