A repeating earthquake catalog for Northern Chile
DOI:
https://doi.org/10.26443/seismica.v4i2.1578Keywords:
Repeating Earthquakes, Clustered Earthquakes, Chile, Subduction Zone, fault creep, fault slip ratesAbstract
Repeating earthquakes are nearly identical seismic events that are assumed to occur reiteratively on the same fault-patch with highly consistent focal mechanisms. Their magnitude-dependent recurrence intervals can be used to estimate local fault-slip and to infer spatial and temporal patterns of aseismically creeping zones at depth.
We construct here the first long-term repeating earthquake catalog for Northern Chile. Using waveforms for 180,000 earthquakes from a recent regional seismicity catalog as templates, a GPU-based template matching is performed to search for repeating earthquakes in the continuous, multiannual seismological data of the permanent IPOC station network between 2006 and 2024. The resulting repeater catalog contains 10,684 events grouped into 3153 families. We observe a notable variability of size and behavior of the families, ranging from long-lasting, regular sequences to short-term, burst-type repeaters. Two megathrust earthquakes in 2007 and 2014 have a strong effect on the spatio-temporal distribution of repeaters. We compute the first time-dependent slip map for the interface between the subducting Nazca slab and the overriding South American plate.
The catalog facilitates future detailed analysis of rupture processes, source structures and the spatio-temporal evolution of slow slip at depth. It also allows for comparative studies with other subduction zones, such as Japan.
References
Beyreuther, M., Barsch, R., Krischer, L., Megies, T., Behr, Y., & Wassermann, J. (2010). ObsPy: A Python Toolbox for Seismology. Seismological Research Letters, 81(3), 530–533. https://doi.org/10.1785/gssrl.81.3.530 DOI: https://doi.org/10.1785/gssrl.81.3.530
Chalumeau, C., Agurto‐Detzel, H., De Barros, L., Charvis, P., Galve, A., Rietbrock, A., Alvarado, A., Hernandez, S., Beck, S., Font, Y., Hoskins, M. C., León‐Ríos, S., Meltzer, A., Lynner, C., Rolandone, F., Nocquet, J., Régnier, M., Ruiz, M., Soto‐Cordero, L., … Segovia, M. (2021). Repeating Earthquakes at the Edge of the Afterslip of the 2016 Ecuadorian MW7.8 Pedernales Earthquake. Journal of Geophysical Research: Solid Earth, 126(5). https://doi.org/10.1029/2021jb021746 DOI: https://doi.org/10.1029/2021JB021746
Chen, Kate Huihsuan, Furumura, T., Rubinstein, J., & Rau, R.-J. (2011). Observations of changes in waveform character induced by the 1999 Mw7.6 Chi-Chi earthquake: HEALING OF SUBSURFACE DAMAGE. Geophysical Research Letters, 38(23). https://doi.org/10.1029/2011gl049841 DOI: https://doi.org/10.1029/2011GL049841
Chen, Kate Huihsuan, Nadeau, R. M., & Rau, R.-J. (2008). Characteristic repeating earthquakes in an arc-continent collision boundary zone: The Chihshang fault of eastern Taiwan. Earth and Planetary Science Letters, 276(3–4), 262–272. https://doi.org/10.1016/j.epsl.2008.09.021 DOI: https://doi.org/10.1016/j.epsl.2008.09.021
Chen, Kate Huihusan, Bürgmann, R., Nadeau, R. M., Chen, T., & Lapusta, N. (2010). Postseismic variations in seismic moment and recurrence interval of repeating earthquakes. Earth and Planetary Science Letters, 299(1–2), 118–125. https://doi.org/10.1016/j.epsl.2010.08.027 DOI: https://doi.org/10.1016/j.epsl.2010.08.027
Duputel, Z., Jiang, J., Jolivet, R., Simons, M., Rivera, L., Ampuero, J. ‐P., Riel, B., Owen, S. E., Moore, A. W., Samsonov, S. V., Ortega Culaciati, F., & Minson, S. E. (2015). The Iquique earthquake sequence of April 2014: Bayesian modeling accounting for prediction uncertainty. Geophysical Research Letters, 42(19), 7949–7957. https://doi.org/10.1002/2015gl065402 DOI: https://doi.org/10.1002/2015GL065402
Folesky, J., Pennington, C. N., Kummerow, J., & Hofman, L. J. (2024). A Comprehensive Stress Drop Map From Trench to Depth in the Northern Chilean Subduction Zone. Journal of Geophysical Research: Solid Earth, 129(1). https://doi.org/10.1029/2023jb027549 DOI: https://doi.org/10.1029/2023JB027549
Gao, D., Kao, H., & Wang, B. (2021). Misconception of Waveform Similarity in the Identification of Repeating Earthquakes. Geophysical Research Letters, 48(13). https://doi.org/10.1029/2021gl092815 DOI: https://doi.org/10.1029/2021GL092815
GFZ German Research Centre For Geosciences, & Institut Des Sciences De L’Univers-Centre National De La Recherche CNRS-INSU. (2006). IPOC Seismic Network. Integrated Plate boundary Observatory Chile - IPOC. https://doi.org/10.14470/PK615318
Hanks, T. C., & Kanamori, H. (1979). A moment magnitude scale. Journal of Geophysical Research: Solid Earth, 84(B5), 2348–2350. https://doi.org/10.1029/jb084ib05p02348 DOI: https://doi.org/10.1029/JB084iB05p02348
Harris, C. R., Millman, K. J., van der Walt, S. J., Gommers, R., Virtanen, P., Cournapeau, D., Wieser, E., Taylor, J., Berg, S., Smith, N. J., Kern, R., Picus, M., Hoyer, S., van Kerkwijk, M. H., Brett, M., Haldane, A., del Río, J. F., Wiebe, M., Peterson, P., … Oliphant, T. E. (2020). Array programming with NumPy. Nature, 585(7825), 357–362. https://doi.org/10.1038/s41586-020-2649-2 DOI: https://doi.org/10.1038/s41586-020-2649-2
Hofman, L. J., Kummerow, J., Cesca, S., Group, A.-S.-D. W., & others. (2023). A new seismicity catalogue of the eastern Alps using the temporary Swath-D network. Solid Earth, 14(10), 1053–1066. https://doi.org/10.5194/se-14-1053-2023 DOI: https://doi.org/10.5194/se-14-1053-2023
Hughes, L., Chamberlain, C. J., Townend, J., & Thomas, A. M. (2021). A Repeating Earthquake Catalog From 2003 to 2020 for the Raukumara Peninsula, Northern Hikurangi Subduction Margin, New Zealand. Geochemistry, Geophysics, Geosystems, 22(5). https://doi.org/10.1029/2021gc009670 DOI: https://doi.org/10.1029/2021GC009670
Hunter, J. D. (2007). Matplotlib: A 2D Graphics Environment. Computing in Science & Engineering, 9(3), 90–95. https://doi.org/10.1109/mcse.2007.55 DOI: https://doi.org/10.1109/MCSE.2007.55
Igarashi, T. (2010). Spatial changes of inter‐plate coupling inferred from sequences of small repeating earthquakes in Japan. Geophysical Research Letters, 37(20). https://doi.org/10.1029/2010gl044609 DOI: https://doi.org/10.1029/2010GL044609
Igarashi, T. (2020). Catalog of small repeating earthquakes for the Japanese Islands. Earth, Planets and Space, 72(1). https://doi.org/10.1186/s40623-020-01205-2 DOI: https://doi.org/10.1186/s40623-020-01205-2
Igarashi, T., Matsuzawa, T., & Hasegawa, A. (2003). Repeating earthquakes and interplate aseismic slip in the northeastern Japan subduction zone. Journal of Geophysical Research: Solid Earth, 108(B5). https://doi.org/10.1029/2002jb001920 DOI: https://doi.org/10.1029/2002JB001920
Kato, A., Fukuda, J., Kumazawa, T., & Nakagawa, S. (2016). Accelerated nucleation of the 2014 Iquique, Chile Mw 8.2 Earthquake. Scientific Reports, 6(1). https://doi.org/10.1038/srep24792 DOI: https://doi.org/10.1038/srep24792
Matsuzawa, T., Uchida, N., Igarashi, T., Okada, T., & Hasegawa, A. (2014). Repeating earthquakes and quasi-static slip on the plate boundary east off northern Honshu, Japan. Earth, Planets and Space, 56(8), 803–811. https://doi.org/10.1186/bf03353087 DOI: https://doi.org/10.1186/BF03353087
Meng, L., Huang, H., Bürgmann, R., Ampuero, J. P., & Strader, A. (2015). Dual megathrust slip behaviors of the 2014 Iquique earthquake sequence. Earth and Planetary Science Letters, 411, 177–187. https://doi.org/10.1016/j.epsl.2014.11.041 DOI: https://doi.org/10.1016/j.epsl.2014.11.041
Menke, W. (1999). Using waveform similarity to constrain earthquake locations. Bulletin of the Seismological Society of America, 89(4), 1143–1146. https://doi.org/10.1785/bssa0890041143 DOI: https://doi.org/10.1785/BSSA0890041143
Met Office. (2010-2015). Cartopy: a cartographic python library with a Matplotlib interface. https://scitools.org.uk/cartopy
Nadeau, R. M., & Johnson, L. R. (1998). Seismological studies at Parkfield VI: Moment release rates and estimates of source parameters for small repeating earthquakes. Bulletin of the Seismological Society of America, 88(3), 790–814. https://doi.org/10.1785/bssa0880030790 DOI: https://doi.org/10.1785/BSSA0880030790
Okuta, R., Unno, Y., Nishino, D., Hido, S., & Loomis, C. (2017). CuPy: A NumPy-Compatible Library for NVIDIA GPU Calculations. Proceedings of Workshop on Machine Learning Systems (LearningSys) in The Thirty-First Annual Conference on Neural Information Processing Systems (NIPS). http://learningsys.org/nips17/assets/papers/paper_16.pdf
Rubinstein, J. L., Uchida, N., & Beroza, G. C. (2007). Seismic velocity reductions caused by the 2003 Tokachi‐Oki earthquake. Journal of Geophysical Research: Solid Earth, 112(B5). https://doi.org/10.1029/2006jb004440 DOI: https://doi.org/10.1029/2006JB004440
Schurr, B., Asch, G., Rosenau, M., Wang, R., Oncken, O., Barrientos, S., Salazar, P., & Vilotte, J. ‐P. (2012). The 2007 M7.7 Tocopilla northern Chile earthquake sequence: Implications for along‐strike and downdip rupture segmentation and megathrust frictional behavior. Journal of Geophysical Research: Solid Earth, 117(B5). https://doi.org/10.1029/2011jb009030 DOI: https://doi.org/10.1029/2011JB009030
Schurr, Bernd, Asch, G., Hainzl, S., Bedford, J., Hoechner, A., Palo, M., Wang, R., Moreno, M., Bartsch, M., Zhang, Y., Oncken, O., Tilmann, F., Dahm, T., Victor, P., Barrientos, S., & Vilotte, J.-P. (2014). Gradual unlocking of plate boundary controlled initiation of the 2014 Iquique earthquake. Nature, 512(7514), 299–302. https://doi.org/10.1038/nature13681 DOI: https://doi.org/10.1038/nature13681
Sippl, C., Schurr, B., Asch, G., & Kummerow, J. (2018). Seismicity Structure of the Northern Chile Forearc From >100,000 Double‐Difference Relocated Hypocenters. Journal of Geophysical Research: Solid Earth, 123(5), 4063–4087. https://doi.org/10.1002/2017jb015384 DOI: https://doi.org/10.1002/2017JB015384
Sippl, Christian, Schurr, B., Münchmeyer, J., Barrientos, S., & Oncken, O. (2023a). Catalogue of Earthquake Hypocenters for Northern Chile from 2007-2021 using IPOC (plus auxiliary) seismic stations. GFZ Data Services. https://doi.org/10.5880/GFZ.4.1.2023.004
Sippl, Christian, Schurr, B., Münchmeyer, J., Barrientos, S., & Oncken, O. (2023b). The Northern Chile forearc constrained by 15 years of permanent seismic monitoring. Journal of South American Earth Sciences, 126, 104326. https://doi.org/10.1016/j.jsames.2023.104326 DOI: https://doi.org/10.1016/j.jsames.2023.104326
Soto, H., Sippl, C., Schurr, B., Kummerow, J., Asch, G., Tilmann, F., Comte, D., Ruiz, S., & Oncken, O. (2019). Probing the Northern Chile Megathrust With Seismicity: The 2014 M8.1 Iquique Earthquake Sequence. Journal of Geophysical Research: Solid Earth, 124(12), 12935–12954. https://doi.org/10.1029/2019jb017794 DOI: https://doi.org/10.1029/2019JB017794
The pandas development team. (2025). pandas-dev/pandas: Pandas. Zenodo. https://doi.org/10.5281/ZENODO.3509134
Uchida, N., & Bürgmann, R. (2021). A Decade of Lessons Learned from the 2011 Tohoku‐Oki Earthquake. Reviews of Geophysics, 59(2). https://doi.org/10.1029/2020rg000713 DOI: https://doi.org/10.1029/2020RG000713
Uchida, Naoki. (2019). Detection of repeating earthquakes and their application in characterizing slow fault slip. Progress in Earth and Planetary Science, 6(1). https://doi.org/10.1186/s40645-019-0284-z DOI: https://doi.org/10.1186/s40645-019-0284-z
Uchida, Naoki, & Bürgmann, R. (2019). Repeating Earthquakes. Annual Review of Earth and Planetary Sciences, 47(1), 305–332. https://doi.org/10.1146/annurev-earth-053018-060119 DOI: https://doi.org/10.1146/annurev-earth-053018-060119
Waldhauser, F., & Schaff, D. P. (2021). A Comprehensive Search for Repeating Earthquakes in Northern California: Implications for Fault Creep, Slip Rates, Slip Partitioning, and Transient Stress. Journal of Geophysical Research: Solid Earth, 126(11). https://doi.org/10.1029/2021jb022495 DOI: https://doi.org/10.1029/2021JB022495
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Copyright (c) 2025 Jonas Folesky, Jörn Kummerow, Laurens Jan Hofman

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Deutsche Forschungsgemeinschaft
Grant numbers FO 1325/3-1