The city of Auckland, New Zealand (Tāmaki Makaurau, Aotearoa), sits on top of an active volcanic field. Seismic stations in and around the city monitor activity of the Auckland Volcanic Field (AVF) and provide data to image its subsurface. The seismic sensors – some positioned at the surface and others in boreholes – are generally noisier during the day than during nighttime. For most stations, weekdays are noisier than weekends, proving human activity contributes to recordings of seismic noise, even on seismographs as deep as 384 m below the surface and as far as 15 km from Auckland's Central Business District. Lockdown measures in New Zealand to battle the spread of COVID-19 allow us to separate sources of seismic energy and evaluate both the quality of the monitoring network and the level of local seismicity. A matched-filtering scheme based on template matching with known earthquakes improved the existing catalogue of five known local earthquakes to 35 for the period between 1 November 2019 and 15 June 2020. However, the Level-4 lockdown from 25 March to 27 April – with its drop in anthropogenic seismic noise above 1 Hz – did not mark an enhanced detection level. Nevertheless, it may be that wind and ocean swell mask the presence of weak local seismicity, particularly near surface-mounted seismographs in the Hauraki Gulf that show much higher levels of noise than the rest of the local network.

中文翻译：

---

新西兰COVID-19锁定期间对奥克兰火山场的地震监测

新西兰奥克兰市（Aotearoa的TāmakiMakaurau）位于活跃的火山场上。城市内外的地震台站监视奥克兰火山场（AVF）的活动，并提供数据以对其地下进行成像。地震传感器（有些位于地表，有些位于井眼中）通常在白天比夜间噪声更大。对于大多数台站而言，工作日比周末嘈杂，即使在地表以下384 m和最远15  km的地震仪上，证明人类活动也有助于记录地震噪声。 从奥克兰的中央商务区。新西兰针对COVID-19传播采取的锁定措施使我们能够分离地震能量的来源，并评估监测网络的质量和当地地震活动的水平。基于与已知地震的模板匹配的匹配过滤方案将现有五种已知本地地震的目录在2019年11月1日至2020年6月15日期间提高到35。然而，从3月25日至4月27日的4级锁定- 1Hz以上人为地震噪声的下降 –未标记增强的检测级别。但是，可能是风和海浪掩盖了当地弱地震性的存在，特别是在豪拉基湾的地表地震仪附近，这些地震仪的噪声水平比本地网络的其余部分高得多。