2005 Salt Lake City Annual Meeting (October 16–19, 2005)

Paper No. 10
Presentation Time: 1:30 PM-5:30 PM


NOVAK, Irwin D., Department of Geosciences, Univ of Southern Maine, 37 College Ave, Gorham, ME 04038-1091, ZOGBY, Molly, Department of Geosciences, University of Southern Maine, Gorham, ME 04038, SOULAKELLIS, Nikoloas, Department of Geography, Univ of Aegean, Mytilini, Greece, LOWMAN, Paul, Goddard Space Flight Cen ter, NASA, Greenbelt, MD 20770 and YATES, Jacob, Goddard Space Flight Center, NASA, Greenbelt, MD 20770, novak@usm.maine.edu

A comprehensive picture of intra-plate (the area straddling the St. Lawrence River valley for Maine and adjacent Quebec and Ottawa in Canada) and active plate (Greece, the Aegean Sea and adjacent western Turkey) regions has been assembled in a Geographic Information System (GIS) in order to compare the two and to assess the geophysical factors at work. Remotely sensed and other digital information assembled included heat flow, Digital Elevation Models, digital geologic maps, seismicity, World Stress Map (WSM) stress vectors, and Global Positioning System (GPS) data. Landsat 5-TM and MODIS satellite imagery were also employed. In addition, for the intra-plate region digital, magnetic field and gravity field data sets were integrated into the GIS.

Earth surface and geophysical features are clearly shown to relate to regional crustal patterns and tectonic elements. As expected, earthquakes are highly correlated with fault patterns in the both areas. For the geophysical data analyzed in the intra-plate locale we found that earthquake epicenters are generally correlated with values of low to intermediate heat flow. For the active plate locale there does not appear to be a correlation between heat flow and earthquake epicenters. Earthquake epicenters in the Maine-Canada region were found to be correlated with zones of high aeromagnetic anomalies and zones of low Bouguer gravity anomalies. No comparable aeromagnetic or Bouguer gravity data were available for the Aegean study area. In the Maine-Canada area magnetic values showed the highest correlation with bedrock geology. The influence of recent regional de-glaciation complicates the interpretation of crustal dynamics in the intra-plate region.

This approach confirms, in one synoptic view, the greater earthquake activity, higher heat flow, faster plate motion, and the “newness” of the Aegean region relative to the Maine and adjacent Canada area.