Microseismicity at the Time of a Large Creep Event on the Calaveras Fault is Unresponsive to Stress Changes
DOI:
https://doi.org/10.26443/seismica.v3i2.1337Abstract
The potential relationship between surface creep and deeper geological processes is unclear, even on one of the world’s best-studied faults. From June to August 2021, a large creep event with surface slip of more than 16 mm was recorded on the Calaveras fault in California, part of the San Andreas fault system. This event initially appeared to be accompanied by along-fault migration of seismicity, suggesting it penetrated to depth. Other studies have suggested that surface creep events are likely a shallow feature, unrelated to deep seismicity. To provide more detail on the relationship between earthquakes, surface creep, and potential aseismic slip at seismogenic depth, we tripled the number of earthquakes in the Northern California Earthquake Catalog in the region of the creep event for all of 2021. This was accomplished by implementing earthquake detection techniques based on both template matching (EQCorrscan) and AI-based automatic earthquake phase picking (PhaseNet). After manual inspection, the detected earthquakes were first located using Hypoinverse and subsequently relocated via GrowClust. Our enhanced catalog indicates that the spatiotemporal pattern of earthquakes here is not strongly influenced by the creep event and is better explained by structural heterogeneity than transient stress changes, indicating a decoupling of seismicity rate and surficial creep on this major fault.
References
Aki, K. (1965). Maximum likelihood estimate of b in the formula log N= a-bM and its confidence limits. Bull. Earthquake Res. Inst., Tokyo Univ., 43, 237–239.
Allen, C., Wyss, M., Brune, J., Grantz, A., & Wallace, R. (1972). Displacements on the Imperial, Superstition Hills, and San Andreas faults triggered by the Borrego Mountain earthquake. US Geol. Surv. Prof. Pap, 787, 87–104.
Bakun, W., & Joyner, W. (1984). The ML scale in central California. Bulletin of the Seismological Society of America, 74(5), 1827–1843. DOI: https://doi.org/10.1785/BSSA0740051827
Bilham, R., & Castillo, B. (2020). The July 2019 Ridgecrest, California, Earthquake Sequence Recorded by Creepmeters: Negligible Epicentral Afterslip and Prolonged Triggered Slip at Teleseismic Distances. Seismological Research Letters, 91(2A), 707-720. DOI: https://doi.org/10.1785/0220190293
Bilham, R., Ozener, H., Mencin, D., Dogru, A., Ergintav, S., Cakir, Z., Aytun, A., Aktug, B., Yilmaz, O., Johnson, W., & Mattioli, G. (2016). Surface creep on the North Anatolian Fault at Ismetpasa, Turkey, 1944–2016. Journal of Geophysical Research: Solid Earth, 121(10), 7409-7431. DOI: https://doi.org/10.1002/2016JB013394
Bilham, R., Langbein, J., Ericksen, T., Nevitt, J., Brooks, B., & Mencin, D. (2021). Fault-zone gas venting and aseismic slip: ventilation or lubrication?. In 2021 SCEC Annual Meeting.
Chamberlain, C., Hopp, C., Boese, C., Warren‐Smith, E., Chambers, D., Chu, S., Michailos, K., & Townend, J. (2017). EQcorrscan: Repeating and Near‐Repeating Earthquake Detection and Analysis in Python. Seismological Research Letters, 89(1), 173-181. DOI: https://doi.org/10.1785/0220170151
Chaussard, E., Bürgmann, R., Fattahi, H., Johnson, C., Nadeau, R., Taira, T., & Johanson, I. (2015). Interseismic coupling and refined earthquake potential on the Hayward-Calaveras fault zone. Journal of Geophysical Research: Solid Earth, 120(12), 8570-8590. DOI: https://doi.org/10.1002/2015JB012230
Dibblee, T., & Minch, J.. (2006). Geologic map of the San Felipe quadrangle, Santa Clara & San Benito Counties, California.
Eijsink, A., Kirkpatrick, J., Renard, F., & Ikari, M. (2022). Fault surface morphology as an indicator for earthquake nucleation potential. Geology, 50(12), 1356-1360. DOI: https://doi.org/10.1130/G50258.1
Evans, K., Burford, R., & King, G. (1981). Propagating episodic creep and the aseismic slip behavior of the Calaveras Fault north of Hollister, California. Journal of Geophysical Research: Solid Earth, 86(B5), 3721-3735. DOI: https://doi.org/10.1029/JB086iB05p03721
Gittins, D., & Hawthorne, J. (2022). Are Creep Events Big? Estimations of Along-Strike Rupture Lengths. Journal of Geophysical Research: Solid Earth, 127(1), e2021JB023001. DOI: https://doi.org/10.1029/2021JB023001
Gutenberg, B., & Richter, C. (1956). Earthquake magnitude, intensity, energy, and acceleration: (Second paper). Bulletin of the seismological society of America, 46(2), 105–145. DOI: https://doi.org/10.1785/BSSA0460020105
Moritz Heimpel, & Peter Malin (1998). Aseismic slip in earthquake nucleation and self-similarity: evidence from Parkfield, California. Earth and Planetary Science Letters, 157(3), 249-254. DOI: https://doi.org/10.1016/S0012-821X(98)00035-1
Hirao, B., Savage, H., & Brodsky, E. (2021). Communication Between the Northern and Southern Central San Andreas Fault via Dynamically Triggered Creep. Geophysical Research Letters, 48(13), e2021GL092530. DOI: https://doi.org/10.1029/2021GL092530
King, C. Y. (2019). Kinematics of slow-slip events. Earthquakes-Impact, community vulnerability and resilience. DOI: https://doi.org/10.5772/intechopen.84904
Li, Y., Bürgmann, R., & Taira, T. (2023). Spatiotemporal Variations of Surface Deformation, Shallow Creep Rate, and Slip Partitioning Between the San Andreas and Southern Calaveras Fault. Journal of Geophysical Research: Solid Earth, 128(1), e2022JB025363. DOI: https://doi.org/10.1029/2022JB025363
Linde, A., Suyehiro, K., Miura, S., Sacks, I., & Takagi, A. (1988). Episodic aseismic earthquake precursors. Nature, 334(6182), 513–515. DOI: https://doi.org/10.1038/334513a0
Marone, C. (1998). Laboratory-derived friction laws and their application to seismic faulting. Annual Review of Earth and Planetary Sciences, 26(1), 643–696. DOI: https://doi.org/10.1146/annurev.earth.26.1.643
NCEDC (2014). Northern California Earthquake Data Center. UC Berkeley Seismological Laboratory. Dataset.
Oppenheimer, D., Bakun, W., & Lindh, A. (1990). Slip partitioning of the Calaveras Fault, California, and prospects for future earthquakes. Journal of Geophysical Research: Solid Earth, 95(B6), 8483-8498. DOI: https://doi.org/10.1029/JB095iB06p08483
Schaff, D., Bokelmann, G., Beroza, G., Waldhauser, F., & Ellsworth, W. (2002). High-resolution image of Calaveras fault seismicity. Journal of Geophysical Research: Solid Earth, 107(B9), ESE–5. DOI: https://doi.org/10.1029/2001JB000633
Schaff, D., & Waldhauser, F. (2005). Waveform cross-correlation-based differential travel-time measurements at the Northern California Seismic Network. Bulletin of the Seismological Society of America, 95(6), 2446–2461. DOI: https://doi.org/10.1785/0120040221
Schulz, Sandra S. Catalog of creepmeter measurements in California from 1966 through 1988. No. 89-650. Dept. of the Interior, US Geological Survey,, 1989. DOI: https://doi.org/10.3133/ofr89650
Schulz, S., Mavko, G., Burford, R., & Stuart, W. (1982). Long-term fault creep observations in central California. Journal of Geophysical Research: Solid Earth, 87(B8), 6977–6982. DOI: https://doi.org/10.1029/JB087iB08p06977
Segall, P. (2010). Earthquake and volcano deformation. Princeton University Press. DOI: https://doi.org/10.1515/9781400833856
Slater, L., & Burford, R. (1979). A comparison of long-baseline strain data and fault creep records obtained near Hollister, California. Tectonophysics, 52(1-4), 481–496. DOI: https://doi.org/10.1016/0040-1951(79)90263-4
Thurber, C. (1996). Creep events preceding small to moderate earthquakes on the San Andreas fault. Nature, 380(6573), 425–428. DOI: https://doi.org/10.1038/380425a0
Thurber, C., & Sessions, R. (1998). Assessment of creep events as potential earthquake precursors: application to the creeping section of the San Andreas fault, California. pure and applied geophysics, 152, 685–705. DOI: https://doi.org/10.1007/s000240050172
Trugman, D., & Shearer, P. (2017). GrowClust: A hierarchical clustering algorithm for relative earthquake relocation, with application to the Spanish Springs and Sheldon, Nevada, earthquake sequences. Seismological Research Letters, 88(2A), 379–391. DOI: https://doi.org/10.1785/0220160188
Tymofyeyeva, E., Fialko, Y., Jiang, J., Xu, X., Sandwell, D., Bilham, R., Rockwell, T., Blanton, C., Burkett, F., Gontz, A., & others (2019). Slow slip event on the Southern San Andreas fault triggered by the 2017 Mw 8.2 Chiapas (Mexico) earthquake. Journal of Geophysical Research: Solid Earth, 124(9), 9956–9975. DOI: https://doi.org/10.1029/2018JB016765
Victor, P., Oncken, O., Sobiesiak, M., Kemter, M., Gonzalez, G., & Ziegenhagen, T. (2018). Dynamic triggering of shallow slip on forearc faults constrained by monitoring surface displacement with the IPOC Creepmeter Array. Earth and Planetary Science Letters, 502, 57–73. DOI: https://doi.org/10.1016/j.epsl.2018.08.046
Wahrhaftig, C., Stine, S. W., and Huber, N. K. Quaternary geologic map of the San Francisco 4 degrees x 6 degrees quadrangle, United States. Technical report, 1993. https://pubs.usgs.gov/ publication/i1420(NJ10). Report.
Waldhauser, F., & Schaff, D. (2008). Large-scale relocation of two decades of Northern California seismicity using cross-correlation and double-difference methods. Journal of Geophysical Research: Solid Earth, 113(B8). DOI: https://doi.org/10.1029/2007JB005479
Zhu, W., & Beroza, G. (2019). PhaseNet: a deep-neural-network-based seismic arrival-time picking method. Geophysical Journal International, 216(1), 261–273. DOI: https://doi.org/10.1093/gji/ggy423
Zhang, M., Ellsworth, W., & Beroza, G. (2019). Rapid Earthquake Association and Location. Seismological Research Letters, 90(6), 2276-2284. DOI: https://doi.org/10.1785/0220190052
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Copyright (c) 2024 Litong Huang, Susan Y Schwartz, Emily E Brodsky
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National Science Foundation
Grant numbers EAR-2031457
