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TitleProgress toward rapid automated moment tensor solutions for Canada
AuthorBent, A; Ackerley, N; Kolaj, M
Source27th International Union of Geodesy and Geophysics General Assembly, abstracts; IUGG19-0679, 2019 p. 1 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20190007
PublisherInternational Union of Geodesy and Geophysics
MeetingIUGG19 - 27th International Union of Geodesy and Geophysics General Assembly; Montreal, QC; CA; July 8-18, 2019
DocumentWeb site
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®); html
ProvinceCanada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut; Canada
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Subjectsgeophysics; Science and Technology; seismology; earthquakes; models; software; Automation
ProgramCanadian Hazard Information Service
ProgramCanadian Hazard Information Service
Released2019 07 01
AbstractRegional moment tensor solutions have been routinely determined for moderate to large earthquakes in eastern Canada for more than a decade. Despite modifications that speed up the process, such as the use of pre-computed Green's functions, the solutions are usually determined a few hours to a few days after the event occurrence primarily because of the need for human input for quality control and regionalization of configuration. As such, moment tensors have been used more as a research tool rather than as a standard part of earthquake response. Some software packages make it possible to determine moment tensor solutions rapidly with little or no human intervention. We evaluate the default (teleseismic) configuration (i.e. setup of velocity models, filtering and windowing) for automatic moment tensor inversion using the SeisComP3 system. Even though the code currently in routine use, MTINV, uses regionally-customized configurations, a qualitative comparison has been very favorable. We start with well-recorded earthquakes occurring on the southeastern Canadian mainland and extend our analysis to other regions of the country, including the far north and offshore. We compare moment magnitudes and focal mechanisms, with attention in the latter case to double-couple and non-double-couple components. This information is extremely valuable to duty seismologists responding to events in real time. Using examples from a real-time SeisComP3 system we show that in many cases a solution was available within 5 minutes and discuss the factors which control this crucial aspect of performance.
Summary(Plain Language Summary, not published)
Moment tensor solutions provide information about earthquake focal mechanisms (style of faulting), depth and moment magnitude, the preferred magnitude for hazard analysis. Currently in Canada, they are calculated a few hours to a few days after the earthquake occurrence due to a need for human input. New software is available that would enable moment tensors to be calculated automatically. We are undertaking a study to compare solutions derived using the current method with the automated to determine its reliability and whether modifications are needed before it can be used in routine monitoring.

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