| Title | Progress toward rapid automated moment tensor solutions for Canada |
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| Author | Bent, A; Ackerley, N; Kolaj, M |
| Source | 27th International Union of Geodesy and Geophysics General Assembly, abstracts; IUGG19-0679, 2019 p. 1  Open Access |
| Links | Online - En ligne
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| Image |  |
| Year | 2019 |
| Alt Series | Natural Resources Canada, Contribution Series 20190007 |
| Publisher | International Union of Geodesy and Geophysics |
| Meeting | IUGG19 - 27th International Union of Geodesy and Geophysics General Assembly; Montreal, QC; CA; July 8-18, 2019 |
| Document | Web site |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf (Adobe® Reader®); html |
| Province | Canada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut;
Canada |
| NTS | 1; 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 |
| Subjects | geophysics; Science and Technology; seismology; earthquakes; models; software; Automation |
| Program | Canadian Hazard Information Service |
| Program | Canadian Hazard Information Service |
| Released | 2019 07 01 |
| Abstract | Regional 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. |
| GEOSCAN ID | 314590 |
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