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Discriminating between low-magnitude shallow earthquakes and road construction blasts near big Salmon River, New Brunswick, Canada

Michal Kolaj
Discriminating between low-magnitude shallow earthquakes and road construction blasts near big Salmon River, New Brunswick, Canada
Seismological Research Letters (June 2018) 89 (5): 1966-1976

Abstract

Spectral ratio discriminants were developed to discriminate between low-magnitude (MN<2) shallow (depth <3 km) earthquakes and blasts related to road construction. The spectral ratios were formed from narrowband spectral-energy estimates between 1 and 40 Hz of Pg, Lg, and Rg for a total of 786 unique discriminants. From these discriminants, it was found that broadband high-frequency Pg/Lg and low-frequency Lg/Rg provided the largest separation between earthquakes and blasts. The high-frequency Pg/Lg spectral ratio confirms the applicability of P/S ratios for the discrimination of low-magnitude blasts from small local/regional shallow earthquakes. Furthermore, the success of the Lg/Rg spectral ratio demonstrates that the normalized Rg component from blasts typical of road construction projects tends to be larger at small epicentral distances (<50 km) than that of shallow earthquakes typical of the area. Although the results presented in this work were developed for a local area, the broader conclusions are likely expandable to other regions in Canada, in particular the Northern Appalachians, where discriminating between low-magnitude blasts related to mining and road construction and shallow earthquakes is a daily challenge.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 89
Serial Issue: 5
Title: Discriminating between low-magnitude shallow earthquakes and road construction blasts near big Salmon River, New Brunswick, Canada
Author(s): Kolaj, Michal
Affiliation: Natural Resources Canada, Canadian hazards Information Service, Ottawa, On, Canada
Pages: 1966-1976
Published: 20180620
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 32
Accession Number: 2018-057731
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N45°00'00" - N48°00'00", W69°00'00" - W65°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201831
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