Outcrop of the accretionary wedge of the former Farallon subduction zone Workgroups Earthquake Processes The Earthquake Processes group uses observational approaches from seismology, geological structural features, and modeling approaches. It studies what causes earthquakes to start, what happens during the fault rupture process, and what influences how destructive they may be. It deals with questions such as, are similar sized earthquakes in different fault settings physically the same? How does fault strength influence when and where earthquakes occur? What is the role of crustal fluids in earthquake nucleation and fault slip speed? How do smaller, more frequent earthquakes relate to larger, less-frequent, more destructive ones? How do the seismic waves of earthquakes thousands of kilometers away trigger local earthquakes? Are earthquakes induced by fluid injection physically different from their tectonic counterparts? Research and current projects Working Group Working Group Leader: Chair of Hydrogeomechanics Prof. Rebecca Harrington, PhD Research and Teaching Staff Dr. Gian Maria Bocchini Dr. Sebastian Carrasco Dr. David Essing Dr. Marco Roth Dr. Alessandro Verdecchia Dr. Xiang Chen MSc Students Lars Höber, BSc Daniel Dreier, BSc Clara Fockenberg, BSc Meggy Roßbach, BSc Anna Schulte, BSc Recent Publications Accepted/in-Press Onwuemeka, J., Y. Liu, R. M. Harrington, Crustal velocity variations and constraints on material properties in the Charlevoix Seismic Zone, eastern Canada, J. of Geophys. Res., accepted. 2021 Wang, B. , A. Verdecchia, H. Kao, R. M. Harrington, Y. Liu, and H. Yu (2021), A study on the largest hydraulic fracturing induced earthquake in Canada: Numerical modeling and triggering mechanism, Bull. of the Seismol. Soc. of Am., v. 111, n. 3, pp. 1392-1404. Verdecchia, A., E. S. Cochran, R. M. Harrington, Fluid-earthquake and earthquake-earthquake interactions in southern Kansas, USA, (2021), J. of Geophys. Res., v. 126, n. 3, e2020JB020384. Bocchini, G. M., P. Martínez-Garzón, R. M. Harrington, and M. Bohnhoff, Does deep non-volcanic tremor occur in the central-eastern Mediterranean basin? (2021), J. of Geophys. Res., v. 126, n. 1, 2020JB020448. 2020 Kemna, K. B., A. F. Pena-Castro, R. M. Harrington, E. S. Cochran, Using a large-n seismic array to explore the robustness of spectral estimations (2020), Geophys. Res. Lett., v. 47, n. 21, e2020GL089342. Wang, B., R. M. Harrington, Y. Liu, H. Kao, H. Yu, A study on the largest hydraulic fracturing induced earthquake in Canada: Observations and stress drop estimation, Bull. of the Seismol. Soc. of Am., v. 110, n. 5, pp. 2283-2294. Yu, H. R. M. Harrington, H. Kao, Y. Liu, R. E. Abercrombie, B. Wang, Well proximity governing spatial variation of stress drop and seismic attenuation associated with hydraulic fracturing induced earthquakes (2020), J. of Geophys. Res, https://doi.org/10.1029/2020JB020103. Roth, M. P., A. Verdecchia, R. M. Harrington, Y. Liu, High-resolution imaging of hydraulic fracturing induced earthquake clusters in the Dawson-Septimus area, northeast British Columbia, Canada (2020), Seismol. Res. Lett., https://doi.org/10.1785/0220200086. Pena-Castro, A. P., M. P. Roth, J. Onwuemeka, Y. Liu, R. M. Harrington, Y. Zhang, H. Kao, Stress chatter on a fracture network reactivated by hydraulic fracturing (2020), Geophys. Res. Lett., https://doi.org/10.1029/2020GL087254. Cochran, E. S., A. Wickham-Piotorwski, K. B. Kemna, R. M. Harrington, S. Dougherty, A. P. Pena-Castro, Minimal clustering of injection-induced earthquakes observed with a Large-N seismic array (2020), Bull. of the Seismol. Soc. of America, https://doi.org/10.1785/0120200101. Kirkpatrick, J. D., J. H. Edwards, A. Verdecchia, J. W. Kluesner, R. M. Harrington, E. A. Silver, Length scales of structural heterogeneity on a subduction interface (2020), Nature Geoscience. Research Infrastructure Broadband/accelerometer Seismometer Pool (10 Nanometrics Trillium Compact 20-sec, 3 Nanometrics Cascadia seismometers, 10-3C, 3-6C Centaur data logger. Trillium Compact 20-sec broadband seismometer installation Rebecca Harrington GeoMax Zenith 15 GSM-UHF Net Rover (Campaign GPS stations): 3 EMLID REACH RS2 Multi-band RTK GNSS receiver DJI Phantom 4 Pro Drone Distributed Acoustic Sensor (DAS) Campaign GPS station and drone used for photogrammetry studies. (Drone is part of the wider GMG equipment) Contact Prof. Rebecca Harrington (PhD) (Chair of Earthquake Processes) Gebäude IA 4/127 Telephone: +49 (0)234-32-23 27 2 e-mail: rebecca.harrington "at" rub.de Nils Hermanns (Administrative Assistant) Gebäude IA 4/137 Telefon: +49 (0)234-32-28 52 1 e-mail: office-erdbebenprozesse "at" rub.de