HR: 1340h
AN: T23A-1203    [Abstracts]
TI: Investigating the Abitibi-Grenville Region, Eastern Canada: Improvements in Resolution From a New Seismograph Network, Central Quebec
AU: * Darbyshire, F A
EM: darbyshire.fiona_ann@uqam.ca
AF: GEOTOP UQÀM-McGill, Université du Québec à Montréal, CP 8888 succursale Centre-Ville, Montréal, QC H3C 3P8, Canada
AU: Villemaire, M
EM: mvillemaire@hotmail.com
AF: GEOTOP UQÀM-McGill, Université du Québec à Montréal, CP 8888 succursale Centre-Ville, Montréal, QC H3C 3P8, Canada
AB: Teleseismic studies of the Superior Craton and neighbouring Proterozoic Grenville Province in eastern Canada have revealed significant variability in lithospheric structure on a sub-provincial scale. Of particular interest is a northwest-southeast trending anomaly of lowered seismic velocity imaged by regional-scale body wave tomography and continental-scale surface wave tomography. Until now, the regional-scale studies have met restrictions in their ability to constrain the 3D geometry of the low-velocity feature, mainly due to a lack of seismograph station coverage in the central part of Quebec. In summer 2007, five new broad-band seismographs were deployed across central and western Quebec. The layout of the array was designed to address the problem of seismograph coverage for lithospheric structure studies across the region. The stations use local AC power and Internet telemetry to provide seismic data in real time. We use P-wave travel-time data from teleseismic earthquakes from the new network in conjunction with POLARIS and CNSN stations in eastern Ontario and western Quebec to study the deep lithospheric structure of the Abitibi-Grenville area and to provide new insights into the tectonic history of the region, including the interaction of cratonic lithosphere with mantle thermal anomalies.
DE: 7200 SEISMOLOGY
DE: 7218 Lithosphere (1236)
DE: 8103 Continental cratons
DE: 8120 Dynamics of lithosphere and mantle: general (1213)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting