Paleoearthquakes Determination of Magnitude~۶.۵ on the North Tehran Fault, Iran
سال انتشار: 1390
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 349
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شناسه ملی سند علمی:
JR_JSEE-13-1_004
تاریخ نمایه سازی: 12 آبان 1400
چکیده مقاله:
The North Tehran Fault is located at the southernmost piedmont of Central Alborz, north of Iran. It stands out as a major active fault menacing directly the city of Tehran, a ۱۲ million people metropolis, and would have been the source of several major historical earthquakes in the past. The fault zone extends up to ۱۱۰km and corresponds mainly to a reverse fault mostly crossing the northern suburbs of the Tehran metropolis, although NTF in its eastern part is characterized more as a left lateral strike slip active fault. We carried out a paleoseismological study of the fault zone in order to determine whether the fault was activated during the Holocene, and to define the characteristics of its activity in terms of kinematics and magnitude. Here in this paper we present only a part of our paleoseismological investigations trench TE۲. Observations fromtwo trenches dug across the North Tehran fault scarp reveal evidence for a maximum of six surface-rupturing events within the late quaternary. According to the empirical relationships among average displacement per event and Moment magnitude [۲۵], we can estimate six events Mw~ ۶.۵ associated with these ruptures in TE۲ trench.
کلیدواژه ها:
نویسندگان
H. Nazari
Université Montpellier
J.F. Ritz
Université Montpellier
A. Ghassemi
Geological Survey of Iran
K. Bahar-Firouzi
Geological Survey of Iran
R. Salamati
Geological Survey of Iran
A. Shafei
Geological Survey of Iran
M. Fonoudi
Geological Survey of Iran