Studies on the June 23, 2010 north Ottawa M W 5.2 earthquake and vicinity seismicity

Ma, Shengwu; Motazedian, Dariush

doi:10.1007/s10950-012-9294-7

Cited by 15 publications

(15 citation statements)

References 40 publications

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“…Visual inspection suggests that the aftershock decay sequence for the Val des Bois is well represented by the derived Omori model. Moreover, the Omori parameters are consistent with those obtained for the same sequence by Ma and Motazedian (2012).…”

Section: Aftershock Parameters In the St Lawrence Valleysupporting

confidence: 85%

Aftershock Statistics for Earthquakes in the St. Lawrence Valley

Fereidoni

Atkinson

2014

Seismological Research Letters

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Understanding the behavior of aftershock sequences is important to obtain a reliable evaluation of seismic hazard. It has been hypothesized that in continental intraplate regions, such as eastern Canada, aftershock sequences may persist for hundreds of years following a strong mainshock. In this study, we statistically characterize the behavior of aftershocks in the St. Lawrence valley, the most seismically active region in eastern Canada. The observed aftershocks of moderate recent earthquakes in the region are used to calibrate the parameters of the Reasenberg and Jones aftershock decay model. The average values obtained for the region fall in the range of the corresponding values of the parameters for earthquakes in California; however, the aftershock sequences in eastern Canada are less energetic on average, and one event (the 1982 Miramichi earthquake) had a longer-than-average aftershock sequence. We use aftershock models for the region, considering the range of parameters obtained from the moderate events, as well as the corresponding parameters for a generic California model, to compute the expected activity rates in the area of the 1663 Charlevoix earthquake, to gain insight into how much of the contemporary activity might be considered part of a prolonged aftershock sequence. We conclude it is very unlikely that contemporary seismicity in Charlevoix represents aftershocks from the 1663 earthquake.

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Section: Aftershock Parameters In the St Lawrence Valleysupporting

confidence: 85%

Aftershock Statistics for Earthquakes in the St. Lawrence Valley

Fereidoni

Atkinson

2014

Seismological Research Letters

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“…23 June 2010 Val-des-Bois earthquake (Ma and Motazedian 2012), but similar to those of the 1975 and 1990 earthquakes in the vicinity. The variability in source mechanisms likely arises from local effects such as topography or crustal density anomalies (Assameur and Mareschal 1995).…”

Section: Main Shockmentioning

confidence: 51%

“…All well-constrained solutions show reverse slip on dipping faults. Data are taken from the following sources: Horner et al (1978); Ma and Adams (2002); Du et al (2003); Ma and Eaton (2007); Mazzotti and Townend (2010); Ma and Motazedian (2012); and this article. The arrows show the azimuth of the P axis.…”

Section: Main Shockmentioning

confidence: 99%

“…Those earthquakes generally do not have accurate focal depth solutions obtained by conventional hypocentral determination methods. Their focal depths were estimated using the regional depth phase modelling (RDPM) method, and both the method and related catalogues are available in the following papers: Ma and Atkinson (2006); Ma and Eaton (2007), and Ma and Motazedian (2012).…”

Section: Introductionmentioning

confidence: 99%

“…Distribution of earthquakes in the WQSZ and vicinity. Solid circles represent epicenters of all m N ≥ 2.8 earthquakes that occurred between 1980 and 2010 with robust focal depths (Ma and Atkinson 2006;Ma and Eaton 2007;Ma and Motazedian 2012), colour-coded by focal depth. The stars labeled 4550 and 7060 are the inferred epicenters of two large paleo-earthquakes (Aylsworth et al 2000).…”

Section: Introductionmentioning

confidence: 99%

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The 5.2 magnitude earthquake near Ladysmith, Quebec, 17 May 2013: implications for the seismotectonics of the Ottawa–Bonnechere Graben

Audet

2014

Can. J. Earth Sci.

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On 17 May 2013 at 1343 hours UTC, a magnitude m N = 5.2 earthquake occurred ϳ4 km from the town of Ladysmith, Quebec, within the Western Quebec Seismic Zone (WQSZ). This event produced limited damage but represents the largest earthquake to occur along the southwest margin of the WQSZ since 1935, and provides important seismotectonic constraints of the intra-cratonic Ottawa-Bonnechere Graben (OBG). We performed a number of analyses of the main shock and aftershocks to determine source properties and obtain structural information. First, a moment tensor inversion of the main shock revealed a moment magnitude of M W = 4.7, with a reverse-sense rupture on a high dip fault, typical of earthquakes within the WQSZ. Dispersion curves for well-recorded Rayleigh waves were then used to estimate a crustal velocity model, which was used to relocate the four largest aftershocks. Hypocenters of relocated aftershocks indicate that the main rupture occurred on a northeast-dipping fault, antithetic to the main graben faults. A comparison of source parameters and aftershock statistics between the 2010 (M W = 5.0) Val-des-Bois earthquake and the 2013 (M W = 4.7) Ladysmith earthquake reveals a larger aftershock moment released by the 2013 event. Together, these results suggest that high-angle faults of the OBG can be reactivated in the current compressive stress regime despite their unfavourable orientation.Résumé : Le 17 mai 2013, à 13 h 43 UTC, un séisme de magnitude m N = 5,2 a eu lieu à environ 4 km de la municipalité de Ladysmith, Québec, dans la zone sismique de l'Ouest du Québec (WQU). Cet événement a engendré peu de dommages mais il représente le plus grand séisme à se produire de long de la bordure sud-ouest de la zone WQU depuis 1935 et il permet d'obtenir des restrictions sismotectoniques au graben intracratonique d'Ottawa-Bonnechère. Nous avons effectué plusieurs analyses de la secousse principale afin de déterminer les propriétés de la source et d'obtenir de l'information sur les structures géologiques. Tout d'abord, une inversion du tenseur des moments de la secousse principale a révélé un moment de magnitude M W = 4,7 avec une rupture en sens inverse sur une faille à pendage élevé, ce qui est typique des séismes dans la zone WQU. Les courbes de dispersion pour des ondes bien enregistrées de Rayleigh ont alors servi à estimer un modèle de vitesse de la croûte, lequel a servi à relocaliser les quatre plus importantes répliques. Les hypocentres des répliques relocalisées indiquent que la rupture principale a eu lieu sur une faille à pendage nord-est, antithétique aux principales failles du graben. Une comparaison des paramètres de la source et des statistiques des répliques entre le séisme de 2010 à Val-des-Bois (M W = 5,0) et celui de 2013 à Ladysmith (M W = 4,7) révèle que l'événement de 2013 a relâché un moment de réplique plus significatif. Pris ensemble, ces résultats indiquent que les failles à angle élevé du graben Ottawa-Bonnechère pourraient être réactivées dans le régime de contraintes compressives actuelles, ...

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Relocation of the 1982 Miramichi, New Brunswick, Canada, aftershock sequence

Motazedian

2022

Preprint

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On 9 January 1982, in the Miramichi region of New Brunswick, Canada, an earthquake with body-wave magnitude (mb) 5.7 occurred. Itwas followed by extensive aftershocks and felt throughout eastern Canada and northeastern USA. Digital seismic stations were not yet commonby 1982. Fortunately, three stations (KLN, EBN and GGN) produced excellent waveform records for the larger aftershocksallowingthese aftershocks to be relocated. For each aftershock,its focal depth was first determinedusing thedepth phase sPg; then, with depth fixed, the epicenter was determinedusing a set of arrival times recorded for the Pg-, Sg-, and Pn-phases at the three stations.Sixty-eight aftershocks were relocated; mostof them occurred in a 5×5 km areaand with depthsof2 to 6 km. The epicentres formed two linear trends in theNE-SW direction. The trends were close to the northeast strike of the focal mechanism of the mainshock and consistent with the topographic trend near the source region. A gap betweenthe trends separated the epicenters into two groups. One group representstherupture area caused by themainshock, and the other groupmight represent the rupture area caused by the mb 5.4principal aftershock.

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Studies on the June 23, 2010 north Ottawa M W 5.2 earthquake and vicinity seismicity

Cited by 15 publications

References 40 publications

Aftershock Statistics for Earthquakes in the St. Lawrence Valley

Aftershock Statistics for Earthquakes in the St. Lawrence Valley

The 5.2 magnitude earthquake near Ladysmith, Quebec, 17 May 2013: implications for the seismotectonics of the Ottawa–Bonnechere Graben

Relocation of the 1982 Miramichi, New Brunswick, Canada, aftershock sequence

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