vallenae.timepicker.modified_energy_ratio

vallenae.timepicker.modified_energy_ratio(arr, win_len=100)[source]

Modified energy ratio method for arrival time estimation.

The modifications improve the ability to detect the onset of a seismic arrival in the presence of random noise.

Parameters:

  • arr (ndarray) – Transient signal of hit

  • win_len (int) – Samples of sliding windows. Default: 100

Return type:

Tuple[ndarray, int]

Returns:

  • Array with computed detection function

  • Index of the estimated arrival time (max value)

References

  • Han, L., Wong, J., & Bancroft, J. C. (2009). Time picking and random noise reduction on microseismic data. CREWES Research Report, 21, 1-13.