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Quaternary tectonics of the North Anatolian fault zone and its environs

北安纳托利亚断裂带及其周围第四纪构造

基本信息

批准号：
02680199
负责人：
IKEDA Yasutaka
金额：
$ 1.28万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02680199/
关键词：
North Anatolian fault active fault satellite imagery plate boundary SPOT映像

项目摘要

The westernmost portion of the North Anatolian fault zone (NAFZ) has been believed to be of transitional nature from the dominantly-transcurrent tectonic regime in the east to the extensional tectonic regime in western Turkey and the Aegean Sea. We analyzed late Quaternary surface deformation in and around this : portion of NAFZ, using SPOT and COSMOS imagery ; limited field observations were employed as ground truth. The following results were obtained :1. Fault offsets on Pleistocene geomorphic surfaces are visible on satellite imagery, whereas those developed on Holocene surfaces are not. Active fault traces detected on the satellite imagery coincide almost exactly with the surface breaks associated with the 1944, 1957 and 1967 earthquakes.2. NAFZ west of the Mudurnu Valley branches into two active fault zones : the lzmit-Sapanca Fault Zone on the north, and the lznik-Mekece fault on the south. The Iznik-Mekece fault is dominantly strike-slip and consists of a simple, continuous strand ; a considerable dipslip component exists on its western portion. In contrast, late Quaternary deformation in the lzmit-Sapanca Fault Zone is quite paradoxical. Our interpretation of satellite imagery and limited field observations indicate that Quaternary surface deformation in this fault zone is compressional, although fault plane solutions of microearthquakes (Evans et al., 1985) suggest that transtensional movements are presently dominant. We speculate that the geometry of faults at seismogenic depths (>6 km) is different from those at the surface.

北安纳托利亚断裂带(NAFZ)的最西端被认为是从东部的横流为主的构造体制向土耳其西部和爱琴海的伸展构造体制过渡的性质。我们使用SPOT和COSMOS图像分析了晚第四纪的地表形变：NAFZ的一部分；有限的野外观测被用作地面事实。结果表明：1.更新世地貌面上的断层错动在卫星图像上可见，而在全新世地表上发育的断层错动在卫星图像上看不到。卫星图像上探测到的活动断层痕迹与1944年、1957年和1967年地震的地表破裂几乎完全一致。Mudurnu山谷以西的NAFZ分成两个活动断裂带：北部的Izmit-Sapanca断裂带和南部的Iznik-Mekess断层。Iznik-Mekess断层以走滑为主，由一条简单、连续的断层组成；其西段存在相当大的倾滑分量。相比之下，伊兹米特-萨潘卡断裂带的晚第四纪变形是相当矛盾的。我们对卫星图像的解释和有限的野外观测表明，该断裂带的第四纪地表变形是挤压的，尽管微震的断层面解(Evans等人，1985)表明目前主要是扭张运动。我们推测，孕震深度(&gt；6公里)的断层的几何形状与地表的不同。