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Isolated cases of remote dynamic triggering in Canada detected using cataloged earthquakes combined with a matched‐filter approach
Author(s) -
Wang Bei,
Harrington Rebecca M.,
Liu Yajing,
Yu Hongyu,
Carey Alex,
Elst Nicholas J.
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl064377
Subject(s) - seismology , geology , waveform , shock (circulatory) , filter (signal processing) , statistical analysis , statistics , medicine , physics , mathematics , quantum mechanics , voltage , computer science , computer vision
Here we search for dynamically triggered earthquakes in Canada following global main shocks between 2004 and 2014 with M S > 6, depth < 100 km, and estimated peak ground velocity > 0.2 cm/s. We use the Natural Resources Canada (NRCan) earthquake catalog to calculate β statistical values in 1° × 1° bins in 10 day 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.