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Standard Event Format for DAS Data

Folder structure:

  • /DASEventData/
    • data folder:
      • ci38443183.h5
      • ...
    • phase_picks folder:
      • ci38443183.csv
      • ...
    • das_info.csv
    • catalog.csv
    • meta_info.txt

Waveform format in the data folder:

For simple explanation, we use the M6.4 Ridgecrest earthquake as an example. We recommand to store raw data without preprocessing such as filtering. In the dataset we are using, we put the first P pick of all channels at 30s and cut a window size of 120s. This convection can be changed according to different DAS arrys and earthquake distributions.

  • File name: ci38443183.h5
    • data: nch \(\times\) nt (float32, unit: microstrain/s; float32)
    • data.attrs:
      • “event_id”: ci38443183 (str)
      • “event_time”: 2019-07-04T17:33:490000+00:00 (str)
      • "event_time_index"1: 2518 (int)
      • “begin_time”: 2019-07-04T17:33:190000+00:00 (str)
      • “end_time”: 2019-07-04T17:35:190000+00:00 (str)
      • “latitude”: 35.705 (float)
      • “longitude”: -117.504 (float)
      • “depth_km”: 10.5 (float)
      • “magnitude”: 6.4 (float)
      • “magnitude_type”: Mw (str)
      • “dt_s”: 0.01 (float)
      • “dx_m”: 8 (float)
      • “unit”: microstrain/s (str)
      • “source”: CI (str)

Phase pick format in the phase_picks folder:

Fhe file name should be the same as the hdf5 file. We recommand use comma (,) as the delimiter of the CSV file.

  • File name: ci38443183.csv
  • Headers: channel_index,phase_index,phase_time,phase_score,phase_type
  • dtype: int32,int32,str,float32,str
    • e.g.:1000,3000,2019-07-04T17:33:520000+00:00,0.98,P

das_info.csv format:

The das_info file has the location information of the DAS array. We recommand use comma (,) as the delimiter of the CSV file.

  • Headers: index,latitude,longitude,elevation_m
  • dtype: int32,float,float,float
    • e.g.: 1,35.695,-117.494,121.1

catalog.csv format:

The cataloa.csv file lists the attrs information of h5 files, which makes it easy to select proper training data. We recommand use comma (,) as the delimiter of the CSV file.

  • Headers: event_id,event_time, latitude, longitude,depth_km,magnitude,magnitude_type,source
  • dtype: str,str,float,float,float,float,str,str
    • e.g.: ci38443183,2019-07-04T17:33:490000+00:00,35.705,-117.504,10.5,6.4,Mw,CI

meta_info.txt format

This file contains other useful information about the dataset

e.g.:

DAS location: ridgecrest

DAS interrogator: quantx

DAS manufacturer: optasense

Earthquake number: 145483

Time range: 2019-06-01T00:00:00.000000+00:00 - 2020-06-01T00:00:00.000000+00:00

Spatial range: (min_latitude, max_latitude, min_longitude, max_longitude) = (-122 -112, 30, 40)

Magnitude range: (-1.0, 8.0)

Catalog source: SCEDC

  1. which data point in the event origin time ↩