Catalogue of Very Low Frequency Events in Mayotte (May 2018–January 2022)

Catalogue of automatically detected and characterised VLF seismic events associated with the Mayotte seismic-volcanic crisis. Schema (columns) - station_code: code of the station used for detection, in the format Network.Station.Location.Channel - eventid: Unique event identifier (YYYYMMDD_HHMMSS) - starttime: Event start time (ISO 8601, UTC) - endtime: Event end time (ISO 8601, UTC) - duration_s: Event duration in seconds (float) - amax: Peak amplitude of the VLF signal (instrument units) - snr: Signal-to-noise ratio (dimensionless) - period_s: Dominant period (seconds) of the VLF waveform for the event - energy: Integrated signal energy (instrument units squared) - period_mean_s: Mean period estimate (seconds) - period_std_s: Standard deviation of the period estimate (seconds) - humps: Count of humps/peaks in the VLF envelope (integer) - t0_s: Model fit window bound or characteristic time (seconds relative to analysis reference) - t1_s: Model fit window bound or characteristic time (seconds relative to analysis reference) - decay_s: Exponential decay constant from envelope fitting (seconds) - baseline: Estimated baseline level prior to event (instrument units) - scale: Scaling parameter used in the event model fit (dimensionless) - origin_time: Estimated event origin time from location procedure (ISO 8601, UTC) - latitude: Estimated event latitude (decimal degrees) - longitude: Estimated event longitude (decimal degrees) - depth_km: Estimated event depth (kilometres) Note that the last four columns (origin_time, latitude, longitude, depth_km) are only included if the event was successfully located. See the Related Publication (Laurent et al., 2025) for information on how the catalogue was built.

与马约特地震火山危机相关的自动检测与特征化甚低频（VLF）地震事件目录。数据结构（字段列）如下：
- station_code：用于事件检测的台站编码，格式为Network.Station.Location.Channel
- eventid：唯一事件标识符（格式为YYYYMMDD_HHMMSS）
- starttime：事件起始时间（ISO 8601格式，协调世界时UTC）
- endtime：事件结束时间（ISO 8601格式，协调世界时UTC）
- duration_s：事件持续时长，单位为秒（浮点型数值）
- amax：VLF信号的峰值振幅（仪器单位）
- snr：信噪比（无量纲）
- period_s：该事件VLF波形的主周期，单位为秒
- energy：积分信号能量（仪器单位平方）
- period_mean_s：周期估计值的均值，单位为秒
- period_std_s：周期估计值的标准差，单位为秒
- humps：VLF包络线内的隆起/峰值数量（整数）
- t0_s：模型拟合窗口边界或特征时间（相对于分析参考点的秒数）
- t1_s：模型拟合窗口边界或特征时间（相对于分析参考点的秒数）
- decay_s：通过包络线拟合得到的指数衰减常数，单位为秒
- baseline：事件发生前的估计基线水平（仪器单位）
- scale：事件模型拟合过程中使用的缩放参数（无量纲）
- origin_time：通过定位流程得到的事件估计起始时间（ISO 8601格式，协调世界时UTC）
- latitude：事件估计纬度（十进制度）
- longitude：事件估计经度（十进制度）
- depth_km：事件估计深度，单位为千米

需注意，仅当事件成功完成定位时，才会包含最后四列（origin_time、latitude、longitude、depth_km）。有关该目录的构建方法，请参阅相关文献（Laurent等人，2025）。