Item talk:Q57535
From geokb
{
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There are seven Mw 4.0\u20134.5, six Mw\u00a04.5\u20135.0, and three Mw \u22655 earthquakes in this event set. We test the regional spectral analysis by comparing the moment magnitudes with the moment magnitudes from the earthquake moment tensors determined by Bob Herrmann (St. Louis University) for 27 events, obtaining dMw=0.004\u00b10.074. We determine the Lg attenuation in seven regions within northeastern North America: Charlevoix, lower St. Lawrence, Maine, Northern New York, lower Great Lakes, Ontario, and Nunavut. These attenuation estimates yield an average attenuation Q=\u00a0(368\u00b113)f\u00a0(0.54\u00b10.02) for the Appalachian region, a stronger attenuation Q=\u00a0(317\u00b116)f\u00a0(0.54\u00b10.03) for the Appalachian lowlands, and a weaker attenuation Q=(455\u00b120)f\u00a0(0.51\u00b10.02) for Ontario and western Quebec. For events in Nunavut and northernmost Quebec, we estimate a similar attenuation for r <450 km, but a weaker attenuation Q=\u00a0(773\u00b170)f\u00a0(0.27\u00b10.06) for Lg propagation for 450< r <1700 kilometers. This far-regional attenuation allows us to analyze recordings of the 1989 Ungava and Payne Bay earthquakes obtained in Ontario and southern Quebec. 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"title": "Regional spectral analysis of moderate earthquakes in northeastern North America\u2014Final Report to the Nuclear Regulatory Commission, Project V6240, Task 3", "topics": [ { "id": "https://openalex.org/T11757", "display_name": "High-Resolution Seismic Noise Tomography", "score": 0.9989, "subfield": { "id": "https://openalex.org/subfields/1908", "display_name": "Geophysics" }, "field": { "id": "https://openalex.org/fields/19", "display_name": "Earth and Planetary Sciences" }, "domain": { "id": "https://openalex.org/domains/3", "display_name": "Physical Sciences" } }, { "id": "https://openalex.org/T12424", "display_name": "Study of Earthquake Precursor Phenomena", "score": 0.9984, "subfield": { "id": "https://openalex.org/subfields/1908", "display_name": "Geophysics" }, "field": { "id": "https://openalex.org/fields/19", "display_name": "Earth and Planetary Sciences" }, "domain": { "id": "https://openalex.org/domains/3", "display_name": "Physical Sciences" } }, { "id": 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