Physics – Geophysics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3121610i&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 21, CiteID L21610
Physics
Geophysics
1
Geochemistry: Geochronology, History Of Geophysics: Seismology, Structural Geology: Fractures And Faults, Tectonophysics: General Or Miscellaneous, Information Related To Geographic Region: Asia
Scientific paper
The tectonic history of the Nojima fault, a ~10 km-long active fault whose movement caused the disastrous 1995 Kobe earthquake, was studied by the apatite fission-track (AFT) dating method. AFT ages of 63-83 Ma from a thermally undisturbed uplifted block indicate relatively minor uplift since ~65 Ma with an estimated total exhumation of ~3.6 km assuming a geothermal gradient of 25°C/km. AFT ages of 44-54 Ma and the nature of the track length distribution from fault-related rocks indicate that fault-related hydrothermal minerals, such as laumontite and chlorite, and foliated cataclasite were formed by ancient fault activity that occurred before ~44 Ma. It is inferred that the Quaternary fault activity of the Nojima fault is a relatively major phase in the entire tectonic history of the Nojima fault.
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