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The major boundary faults in eastern Long Valley Caldera; magnetotelluric and gravity constraints
Author(s) -
Hermance John F.,
Karlsdottir Ragna
Publication year - 1986
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl013i005p00479
Subject(s) - geology , magnetotellurics , caldera , seismology , offset (computer science) , geophysics , gravity anomaly , fault (geology) , geodesy , volcano , paleontology , oil field , electrical resistivity and conductivity , computer science , electrical engineering , programming language , engineering
Geophysical studies of the major boundary fault(s) in eastern Long Valley caldera have led to significantly different models being proposed for the subsurface structure of this area. Pakiser originally interpreted gravity data to propose a steep vertical offset across the eastern boundary fault(s) which may be as great as 5 km. On the other hand, Hill employing seismic refraction data, and Abers, who reinterpreted the available gravity data in the light of the "hard" seismic constraints of Hill, suggested that the offset across this fault may be much more gentle. However, new magnetotelluric data may call for a revision of these models. Based on these recent MT results, offsets along the eastern boundary fault appear to be somewhat steeper than recent models would suggest. Our current thinking would favor a model more in keeping with the one originally envisaged by Pakiser, but with less throw (approximately 2 km) across the faults.