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Seismic imaging of the 1999 Izmit (Turkey) Rupture inferred from the near‐fault recordings
Author(s) -
Bouchon Michel,
Toksöz Nafi,
Karabulut Hayrullah,
Bouin MariePaule,
Dietrich Michel,
Aktar Mustafa,
Edie Margaret
Publication year - 2000
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 - 10.1029/2000gl011761
Subject(s) - seismology , geology , slip (aerodynamics) , fault (geology) , shear (geology) , north anatolian fault , seismic gap , fault scarp , active fault , tectonics , elastic rebound theory , petrology , physics , thermodynamics
We use near‐fault accelerograms to infer the space‐time history of rupture on the fault during the Izmit earthquake. The records show that the ground displacement and velocity near the fault were surprisingly simple. Rupture propagated toward the west at a velocity of about 3 km/s, and toward the east at a remarkably high average velocity of 4.7 km/s over a distance of about 45 km before decelerating to about 3.1 km/s on the eastern segment. Slip on the fault is particularly large down to a depth of 20 km on the central portion of the fault where it reaches about 7 m. Slip is large also below 10 km on the eastern fault segment, and this may have contributed to the loading of shear stress on the Düzce fault. On the western fault segment, large slip seems confined to shallow depths.