Isolated cases of remote dynamic triggering in Canada detected using cataloged earthquakes combined with a matched-filter approach

• Published in: Geophysical Research Letters
• Main Authors: Wang, Bei, Harrington, Rebecca M., Liu, Yajing, Yu, Hongyu, Carey, Alex, van der Elst, Nicholas J.
• Other Authors: Wang, B (reprint author), McGill Univ, Dept Earth & Planetary Sci, Montreal, PQ, Canada., McGill Univ, Dept Earth & Planetary Sci, Montreal, PQ, Canada., Peking Univ, Inst Theoret & Appl Geophys, Beijing 100871, Peoples R China., US Geol Survey, Pasadena, CA 91106 USA.
• Format: Journal/Newspaper
• Language: English
• Published: GEOPHYSICAL RESEARCH LETTERS 2015
• Subjects: remote dynamic triggering; crustal earthquakes; matched filter; BAND REGIONAL SEISMOGRAMS; DENALI FAULT EARTHQUAKE; UNITED-STATES; SEISMICITY; ALBERTA; PERMEABILITY; CALIFORNIA; MECHANISM; LANDERS; Canada; Northwest Territories; Yukon
• Online Access: https://hdl.handle.net/20.500.11897/418314; https://doi.org/10.1002/2015GL064377

Here we search for dynamically triggered earthquakes in Canada following global main shocks between 2004 and 2014 with M-S>6, depth<100km, and estimated peak ground velocity>0.2cm/s. We use the Natural Resources Canada (NRCan) earthquake catalog to calculate statistical values in 1 degrees x1 degrees bins in 10day windows before and after the main shocks. The statistical analysis suggests that triggering may occur near Vancouver Island, along the border of the Yukon and Northwest Territories, in western Alberta, western Ontario, and the Charlevoix seismic zone. We also search for triggering in Alberta where denser seismic station coverage renders regional earthquake catalogs with lower completeness thresholds. We find remote triggering in Alberta associated with three main shocks using a matched-filter approach on continuous waveform data. The increased number of local earthquakes following the passage of main shock surface waves suggests local faults may be in a critically stressed state. NSERC; McGill new faculty startup fund SCI(E) EI ARTICLE [e-mail] 13 5187-5196 42