In March 2020, the coronavirus disease 2019 outbreak was declared a pandemic by the World Health Organization and became a global health crisis. Authorities worldwide implemented lockdowns to restrict travel and social exchanges in a global effort to counter the pandemic. In France, and in French overseas departments, the lockdown was effective from 17 March to 11 May 2020. It was in this context that the 2–6 April 2020 eruption of Piton de la Fournaise (La Reunion Island, Indian Ocean) took place. Upon the announcement of the lockdown in France, a reduced activity plan was set up by the Institut de Physique du Globe de Paris, which manages the Observatoire Volcanologique du Piton de la Fournaise (OVPF). The aim was to (1) maintain remote monitoring operations by teleworking and (2) authorize fieldwork only for critical reasons, such as serious breakdowns of stations or transmission relays. This eruption provided an opportunity for the observatory to validate its capacity to manage a volcanic crisis with 100% remotely operated monitoring networks. We thus present the long‐ and short‐term precursors to the eruption, and the evolution of the eruption recorded using the real‐time monitoring data as communicated to the stakeholders. The data were from both continuously recording and transmitting field instruments as well as satellites. The volcano observatory staff remotely managed the volcano crisis with the various stakeholders based only on these remotely functioning networks. Monitoring duties were also assured in the absence of ad hoc field investigation of the eruption by observatory staff or face‐to‐face communications. The density and reliability of the OVPF networks, combined with satellite observations, allowed for trustworthy instrument‐based monitoring of the eruption and continuity of the OVPF duties in issuing regular updates of volcanic activity in the context of a double crisis: volcanic and health.

中文翻译：

---

COVID-19 封锁期间 Piton de la Fournaise（留尼汪岛）的火山危机管理

2020 年 3 月，2019 年冠状病毒病疫情被世界卫生组织宣布为大流行病，并成为全球健康危机。世界各地的当局实施了封锁措施，以限制旅行和社会交流，以应对全球流行病。在法国和法国海外省，封锁于 2020 年 3 月 17 日至 5 月 11 日生效。正是在这种情况下，2020 年 4 月 2 日至 6 日发生了 Piton de la Fournaise（印度洋留尼汪岛）的喷发。在法国宣布封锁后，负责管理福尔奈斯火山天文台 (OVPF) 的巴黎地球物理研究所制定了一项减少活动计划。目的是 (1) 通过远程工作维持远程监控操作，以及 (2) 仅出于关键原因授权现场工作，例如站点或传输中继的严重故障。这次喷发为天文台提供了一个机会，可以验证其通过 100% 远程操作的监测网络管理火山危机的能力。因此，我们展示了喷发的长期和短期前兆，以及使用与利益相关者沟通的实时监测数据记录的喷发演变。数据来自连续记录和传输的现场仪器以及卫星。火山观测站的工作人员仅基于这些远程运行的网络与各个利益相关者远程管理火山危机。在没有天文台工作人员对火山喷发进行临时实地调查或面对面交流的情况下，监测职责也得到了保证。OVPF 网络的密度和可靠性，