Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.3081m&link_type=abstract
Geophysical Research Letters, Volume 24, Issue 23, p. 3081-3084
Physics
2
Seismology: Seismicity And Seismotectonics, Structural Geology: Fractures And Faults, Seismology: Paleoseismology, Seismology: Earthquake Dynamics And Mechanics
Scientific paper
The geometry, kinematics and rates of deformation within a fault segment boundary between the ends of two major active normal fault segments have been investigated through examination of a faulted 126 ka marine terrace. Slip-vector azimuths defined by striations on the faults indicate N-S extension on c. E-W faults, sub-parallel to those from earthquake focal mechanisms, together with significant and contemporaneous E-W extension on c. N-S faults. Summed rates of E-W extension along a c. 550 m transect (0.17 mm/yr) are comparable with those for N-S extension (0.20 mm/yr) along a c. 350 m transect. Our observations show that distributed non-plane strain extension occurs in fault segment boundaries and this should be noted when studying fault-tip fracture toughness and regional deformation rates.
Morewood Nigel C.
Roberts Philippa G.
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