...Allison L. Bent Abstract On 25 December 1989 the largest earthquake ( M S 6.3) in northern Quebec in at least 60 yr occurred in the Ungava Peninsula. This earthquake was unique in that it marked the first time surface faulting could be confirmed for a historical eastern North American earthquake...

... took place in the Ungava Peninsula of northern Quebec in 1989 ( Adams et al. 1991 ). Other than some minor offsets of glacial striations ( Oliver et al. 1970 ), no geologic evidence of Holocene surface faulting in the northeastern United States has been reported in the literature. Furthermore...

... moment. The following events are studied- 9 January 1982 New Brunswick; 5 October and 23 December 1985 Nahanni; 25 November 1988 Saguenay; and 25 December 1989 Ungava earthquakes. We employ a finite-fault, waveform inversion scheme that discretizes the slip history as a function of position on the fault...

... Canada since 1988. The other two are the 1988 Saguenay earthquake (mbLg 6.5) and the 1989 Ungava earthquake (mbLg 6.1), both shown in Figure 1. Like the other two, the Franklin Lake earthquake occurred in an area with no known previous large earthquakes and thus resulted in a rare opportunity to expand...

..., (b) 1989 M  6.3 Ungava, (c) 1992 M  5.5 Franklin Lake, (d) 2017 M  5.9 Barrow Strait, (e) six earthquakes between magnitude 5.3 and 5.9, together with the M  5.0 Val‐des‐Bois binned mean intensities ( Atkinson and Assatourians, 2010 ). Note that the two values that fall close...

... Geophysics 146 , 5 – 20 . Bent , A. L. ( 1994 ). The 1989 (Ms 6.3) Ungava, Quebec earthquake: A complex intraplate event , Bulletin of the Seismological Society of America 84 , 1,075 – 1,088 . Bent , A. L. ( 2002 ). Polarization Analysis of Four Canadian National Seismograph...

... earthquake in Gaza, New Hampshire (mbzg = 4.5), the 7 October 1983 earthquake in Goodnow, New York, (mbzg = 5.2), the 31 January 1986 earthquake in Painesville, Ohio (mblg = 5.0), the 25 November 1988 earth- quake in Saguenay, Quebec ( m b z g = 6.3), and finally, the 25 December 1989 earthquake in Ungava...

...Figure 1. Seismicity of northern Canada. The box outlines the Boothia‐Ungava Seismic Zone (BUSZ). The B indicates the location of the 2017 Barrow Strait earthquakes, the I indicates the location of the 2017 Isachsen earthquake, and the “1989” the location of the 1989 Ungava earthquake...

... ). Geological controls on the 1989 Ungava surface rupture a preliminary interpretation , Geol. Surv. Can. Pap. 92C 147 – 155 . Adams J. Wetmiller R. Hasegawa H. Drysdale J. ( 1991 ). The first surface faulting from a historical earthquake in North America , Nature 352 , 617 – 619...

... of these regions ranges between M 5.7 and M 6.8 ( Table 3 ). All the seismicity observed in these regions occurred within the upper crust and at five locations it occurred within the top 7 km. One of the largest recent earthquakes in eastern North America was the 25 December 1989 M s 6.3 Ungava earthquake...

... © 1990 by the Seismological Society of America 1990 SURFACE FAULTING AND LAKESHORE DEFORMATION CAUSED BY THE 1989 UNGAVA EARTHQUAKE ADAMS, J., WETMILLER. R. J. , HASEGAWA, H. S., LAMONTAGNE, M., and DRYSDALE, J., Geophysics Division, Geological Survey of Canada, 1 Observatory Crescent...

... Research Letters 79 , 119 – 131 . Bent , A. L. ( 1994 ). The 1989 ( M S 6.3) Ungava, Quebec earthquake: A complex intraplate event . Bulletin of the Seismological Society of America 84 , 1,075 – 1,088 . Bent , A. L. ( 2009 ). A Moment Magnitude Catalog for the 150 Largest...

... sequences of eastern Canada, such as the 1982 M  5.8 Miramichi, New Brunswick, the 1988 M  5.9 Saguenay, Quebec, and the 1989 M 6.3 Ungava events. In that latter, he was the leader of the field survey and was the first person to visually recognize the surface rupture of the 1989 Ungava earthquake...

... indicate glacial retreat from northeast to southwest (e.g., Bouchard 1989 ). The crater was one of the last areas of the ice sheet in the Ungava Peninsula to become ice-free ( Dyke and Prest 1987 ; Lauriol and Gray 1987 ). In addition, due to the favorable morphometry of the crater (shape and depth...

... . Bent A. (1994) . The 1989 (Ms 6.3) Ungava, Quebec earthquake: a complex intraplate event , Bull. Seism. Soc. Am. 84 , no. 4 , 1075 - 1088 . Châtelain J. (1978) . Etude fine de la sismicité...