ML-Enhanced catalog of the 5 April 2024 Tewksbury aftershocks

Machine-learning-enhanced catalog of the aftershocks of the 5 April 2024 M4.8 Tewksbury, New Jersey earthquake. It accompanies the following article submitted to Geophysical Research Letters: The 5 April 2024 Tewksbury, New Jersey aftershock sequence resolved with machine-learning-enhanced detection methods This repository contains the pre-relocation catalog (catalog_Tewksbury_aftershocks_before_relocation.csv) and the relocated catalog (catalog_Tewksbury_aftershocks_relocated.csv). Columns of the pre-relocation catalog: event_id: Unique string identifying an event. Mw: Moment magnitude, computed when possible only (so, most of the events have NaNs because they were too small to estimate Mw). Mw_err: Error on moment magnitude. Mw*: Approximate moment magnitude. longitude: Event longitude. latitude: Event latitude. depth: Event depth in km. origin_time: Event UTC origin time. origin_time_local: Event local origin time. hmax_unc: Event location maximum horizontal 1-std uncertainty, in km. hmin_unc: Event location minimum horizontal 1-std uncertainty, in km. vmax_unc: Event location maximum horizontal 1-std uncertainty, in km. az_hmax_unc: Azimuth of the event location maximum horizontal uncertainty. tt_rms: Residual travel-time, in sec. n_dev: Network-averaged correlation coefficient in units of CC RMS (matched-filtering). potential_quarry_blast: True or False. Flags potential quarry blast, ie, anthropogenic earthquake. Columns of the relocated catalog: event_id: Unique string identifying an event. origin_time: Event UTC origin time. longitude: Event longitude. latitude: Event latitude. depth: Event depth in km. Mw*: Approximate moment magnitude. hmax_unc: Event location maximum horizontal uncertainty, 95% CI, in km. Computed with bootstrapping. hmin_unc: Event location minimum horizontal uncertainty, 95% CI, in km. Computed with bootstrapping. vmax_unc: Event location maximum horizontal uncertainty, 95% CI, in km. Computed with bootstrapping. az_hmax_unc: Azimuth of the event location maximum horizontal uncertainty. quality: "A" or "B". "A" events were relocated with stronger inter-event linkage in HypoDD.本数据集为2024年4月5日新泽西州图克斯伯里（Tewksbury）M4.8级地震的机器学习增强余震目录，配套投稿于《地球物理研究快报》（Geophysical Research Letters）的论文如下： 《基于机器学习增强检测方法解析的2024年4月5日新泽西州图克斯伯里余震序列》 本代码仓库包含重定位前余震目录（catalog_Tewksbury_aftershocks_before_relocation.csv）与重定位后余震目录（catalog_Tewksbury_aftershocks_relocated.csv）。 ### 重定位前余震目录各字段说明： event_id：事件唯一标识字符串 Mw：矩震级，仅在可计算时给出（多数事件因震级过小无法估算矩震级，故对应值多为NaN） Mw_err：矩震级误差 Mw*：近似矩震级 longitude：事件经度 latitude：事件纬度 depth：事件震源深度，单位为千米 origin_time：事件UTC发震时刻 origin_time_local：事件本地发震时刻 hmax_unc：事件定位最大水平1σ不确定度，单位为千米 hmin_unc：事件定位最小水平1σ不确定度，单位为千米 vmax_unc：事件定位最大水平1σ不确定度，单位为千米 az_hmax_unc：事件定位最大水平不确定度的方位角 tt_rms：走时残差，单位为秒 n_dev：以CC RMS（匹配滤波）为单位的台网平均相关系数 potential_quarry_blast：布尔值（真/假），用于标记潜在矿山爆破事件，即人工诱发地震 ### 重定位后余震目录各字段说明： event_id：事件唯一标识字符串 origin_time：事件UTC发震时刻 longitude：事件经度 latitude：事件纬度 depth：事件震源深度，单位为千米 Mw*：近似矩震级 hmax_unc：事件定位最大水平不确定度（95%置信区间），单位为千米，通过自助法（bootstrap）计算得到 hmin_unc：事件定位最小水平不确定度（95%置信区间），单位为千米，通过自助法（bootstrap）计算得到 vmax_unc：事件定位最大水平不确定度（95%置信区间），单位为千米，通过自助法（bootstrap）计算得到 az_hmax_unc：事件定位最大水平不确定度的方位角 quality：评级为"A"或"B"，其中"A"类事件通过HypoDD中更强的事件间关联完成重定位