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Slip‐parallel seismic lineations on the Northern Hayward Fault, California
Author(s) -
Waldhauser Felix,
Ellsworth William L.,
Cole Alex
Publication year - 1999
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 - 10.1029/1999gl010462
Subject(s) - lineation , geology , seismology , induced seismicity , slip (aerodynamics) , fault (geology) , earthquake location , hypocenter , fault plane , strike slip tectonics , geodesy , tectonics , physics , thermodynamics
A high‐resolution relative earthquake location procedure is used to image the fine‐scale seismicity structure of the northern Hayward fault, California. The seismicity defines a narrow, near‐vertical fault zone containing horizontal alignments of hypocenters extending along the fault zone. The lineations persist over the 15‐year observation interval, implying the localization of conditions on the fault where brittle failure conditions are met. The horizontal orientation of the lineations parallels the slip direction of the fault, suggesting that they are the result of the smearing of frictionally weak material along the fault plane over thousands of years.