Mathematics – Logic
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..619g&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 7, p. 619-622.
Mathematics
Logic
3
Earth Crust, P Waves, Seismology, Wave Propagation, Wave Reflection, Data Processing, Geological Faults, Mathematical Models, Tectonics
Scientific paper
Wide-angle reflection data from Archean crust in southern Minnesota were processed and modeled to place constraints on the average crustal structure and nature of the Moho. A crustal thickness of between 45 and 51 km is suggested by preliminary one-dimensional extremal inversion of arrivals extracted from vibroseis and quarry blast recordings. Broad band arrival times indicate that the Moho beneath the Archean gneiss terrane is not a simple velocity gradient but a layered zone involving small velocity contrasts. The bounds on average crustal velocity derived by extremel inversion suggest a crust that is intermediate to mafic with an increasingly mafic or plagioclase-rich composition with depth.
Gohl Karsten
Hawman Robert B.
Smithson Scott B.
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