PALM 4.x

An Earthquake Detection and Location Architecture for Continuous Seismograms: Phase Picking, Association, Location, and Matched Filter (PALM)

PALM Workflow

1. PAL

1.1 phase Picking 1.2 phase Association 1.3 event Location

• Usage (see run_pal for example workdir)

(1) Prepare continuous data into consistent directory structure (2) Run PAL

2. MESS

2.1 Match: calculate CC trace on every station (matched filter) 2.2 Expand: expand peak values on CC traces 2.3 Shift: time shift to origin times for all CC traces 2.4 Stack: stack CC traces of different stations & detect events on the stacked trace 2.5 dtp and dts are picked by cross-correlation

• Usage (see run_mess for example workdir)

(1) Prepare template phase file (i.e. run PAL) & cut template waveform (2) Run MESS

Tutorials

2021/10 Online training in Chinese: vedio recording on KouShare 2022/08 Online training in Chinese: vedio recording on KouShare

Installation

PALM is a set of codes. All you need is to setup proper Python environment. This can be accomplished easily by installing Anaconda and Obspy sequentially.

References

• Ding, H., Y. Zhou, Z. Ge, T. Taymaz, A. Ghosh, ... & X. Song (2023). High-Resolution Seismicity Imaging and Early Aftershocks Migration of the 2023 Kahramanmaraş (SE Türkiye) M_w 7.9 & 7.8 Earthquake Doublet. Earthquake Science*; doi: 10.1016/j.eqs.2023.06.002

• Zhou, Y., C. Ren, A. Ghosh, H. Meng, L. Fang, H. Yue, et al. (2022). Seismological Characterization of the 2021 Yangbi Foreshock-Mainshock Sequence, Yunnan, China: More than a Triggered Cascade. Journal of Geophysical Research: Solid Earth; 127(8). doi: 10.1029/2022JB024534

• Zhou, Y., H. Yue, S. Zhou, L. Fang, Y. Zhou, L. Xu, et al. (2022). Microseismicity along Xiaojiang Fault Zone (Southeastern Tibetan Plateau) and the Characterization of Interseismic Fault Behavior. Tectonophysics; 833: 229364. doi: 10.1016/j.tecto.2022.229364

• Zhou, Y., A. Ghosh, L. Fang, H. Yue, S. Zhou, & Y. Su (2021). A High-Resolution Seismic Catalog for the 2021 M_S6.4/M_w6.1 YangBi Earthquake Sequence, Yunnan, China: Application of AI picker and Matched Filter. Earthquake Science; 34(5): 390-398. doi: 10.29382/eqs-2021-0031

• Zhou, Y., H. Yue, L. Fang, S. Zhou, L. Zhao, & A. Ghosh (2021). An Earthquake Detection and Location Architecture for Continuous Seismograms: Phase Picking, Association, Location, and Matched Filter (PALM). Seismological Research Letters*; 93(1): 413–425. doi: 10.1785/0220210111