Publikationsdatum:
2017-04-04
Beschreibung:
The November 12, 1999, Mw 7.1 earthquake, ruptured the Düzce segment of the
North Anatolian Fault Zone and produced a ca. 40 km-long surface rupture. To improve
knowledge about earthquake recurrence on this fault, we undertook paleoseismological
trench investigations. We found evidence for repeated surface faulting paleoearthquakes
pre-dating the 1999 event during the past millennium. Dating was based on radiocarbon,
210Pb analyses, and archaeological considerations. In addition to the 1999 earthquake, prior
surface faulting earthquakes are dated as follows: AD1685-1900 (possibly end of 19th
century); AD1495-1700; AD685-1020 (possibly AD890-1020). The AD967 and AD1878
historical earthquakes are good candidates to have ruptured the Düzce fault correlating
with the oldest and penultimate paleoearthquakes. No obvious correlation for the third
paleoearthquake (AD1495-1700) exists. These results shows that the Düzce fault
considerably participates, along with the parallel Mudurnu fault sections, in the
seismogenic deformation taking place along this part of the North Anatolian Fault.
Four events since AD 685-1020 (possibly AD890-1020), would yield an average
recurrence time for the Düzce fault of 330-430 yr (possibly 330-370 yr). The three most
recent earthquakes, including 1999, occurred within 500 yr. Merging results from other
paleoseismological studies along the Düzce fault show a consistency of results and yields
average recurrence times for the past 2000 yr of 320-390 yr. Assuming that the 1999 slip
(2.7 m average, 5 m maximum) is representative of the behavior of this fault, the above
recurrence times yield a reference figure of fault slip rate in the range 6.9-15.6 mm/yr.
Beschreibung:
European Community project RELIEF
Beschreibung:
In press
Beschreibung:
3.2. Tettonica attiva
Beschreibung:
JCR Journal
Beschreibung:
open
Schlagwort(e):
1999 earthquake
;
North Anatolian Fault
;
Paleoearthquakes
;
earthquake recurrence
;
04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology
Repository-Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Materialart:
manuscript
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