Fast double-difference cross-correlation (FDTCC)
Authors: Min Liu & Miao Zhang
m.liu@dal.ca & miao.zhang@dal.ca
1.Usage
FDTCC -C(ife/ifd/ifp) -W(wb/wa/wf/wbs/was/wfs) -D(delta/threshold/thre_SNR/thre_shift) -G(trx/trh/tdx/tdh)
-B(low/high) -F(f)
--------------------------------------explanation----------------------------------------
-C: specify the path of event.sel, dt.ct and phase.dat (1: yes, 0: default names)
-W: waveform window length before and after picks and their maximum shift length
-D: sampling interval, CC threshold, SNR threshold, maximum abs(t1-t2) of the two picks
-G: ranges and grids in horizontal direction and depth (in traveltime table)
-F: input data format (0: continuous data; 1: event segments)
-B: waveform bandpass filtering (e.g., 2/8; -1/-1: no filter applied).
SAC name format: date/net.sta.comp, e.g., 20210101/AA.BBBB.HHZ
or eventID/net.sta.comop, e.g., 8/AA.BBBB.HHZ).
staDir: stations directory
tttDir: travel-time directory
wavDir: waveform directory
eveDir: event.sel (optional)
dctDir: dt.ct (optional)
paDir: phast.dat (optional)
2.Input file
phase.dat # in hypoDD format
event.sel # in hypoDD format
dt.ct # in hypoDD format
station.dat # in REAL format
waveform data # raw data
travel-time table # in REAL format
3.Outfile
dt.cc # can be used in hypoDD, Growclust and tomoDD directly
4.Demo
$bash runFCC.sh
If you use FDTCC in research that you submit, please cite the two papers:
1) Multistage Nucleation of the 2021 Yangbi MS 6.4 Earthquake and Its Foreshocks, Journal of Geophysical Research: Solid Earth, 2022, https://doi.org/10.1029/2022JB024091.
2) Investigation of the 2013 Eryuan, Yunnan, China MS 5.5 Earthquake Sequence: Aftershock Migration, Seismogenic Structure and Hazard Implication, Tectonophysics, 2022, https://doi.org/10.1016/j.tecto.2022.229445
FDTCC is integrated into the earthquake detection and location workflow - LOC-FLOW, more details please see our SRL paper:
LOC-FLOW: An End-to-End Machine-Learning-Based High-Precision Earthquake Location Workflow, Seismological Research Letters, 2022, https://doi.org/10.1785/0220220019
