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dc.contributor.authorPlafcan, D.
dc.contributor.authorSandvol, E.
dc.contributor.authorSeber, D.
dc.contributor.authorBarazangi, M.
dc.contributor.authorIbenbrahim, A.
dc.contributor.authorCherkaoui, T-E.
dc.date.accessioned2007-01-29T15:58:17Z
dc.date.available2007-01-29T15:58:17Z
dc.date.issued1997
dc.identifier.citationBulletin of the Seismological Society of America, vol. 87, no. 5, p. 1126-1139, 1997en
dc.identifier.issn0037-1106
dc.identifier.urihttp://hdl.handle.net/1813/5283
dc.descriptionCopyright 1997, Seismological Society of America. See also: http://www.seismosoc.org/publications/bssa-toc.html; http://atlas.geo.cornell.edu/morocco/publications/plafcan1997.htmen
dc.description.abstractTo examine the limitations in the techniques for discriminating between chemical explosions and earthquakes at local and regional distances, we have applied several standard heuristics to seismic events in northwest Morocco where little a priori information was available. Although the eight Oud Zem phosphate mine explosions have similar geographic locations, total charge size, and presumably ripple-fired mechanisms, the seismic recordings are characterized by a surprising amount of diversity. Time and path independent modulations, due to the periodic source mechanism of the ripple-fired explosions, rarely unequivocally distinguish the explosions from the earthquakes. Our findings imply that more often than the current literature suggests, source inconsistencies such as differing blasting arrangements have a role in the failure of common discriminants. Furthermore, crustal seismic velocity and the attenuation structure seemed to shape the seismic signals more than the nature of the source mechanism, although site effects could not be ruled out. The 10- to 15-Hz Pg/Sg ratio test proved to be the most precise and accurate discriminant. Popular intraphase spectral and cross-spectral ratios performed considerably worse. Finally, we argue that a regional case-based approach requires extensive regional information to meet the demanding verification goals of the Comprehensive Test Ban Treaty.en
dc.format.extent8986 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherSeismological Society of Americaen
dc.subjectMoroccoen
dc.subjectEarthquakesen
dc.subjectChemical explosionsen
dc.subjectComprehensive Test Ban Treatyen
dc.titleRegional discrimination of chemical explosions and earthquakes: A case study in Moroccoen
dc.typeperiodicalen


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