Seismic activity triggered by the 1999 Izmit earthquake and its implications for the assessment of future seismic risk
Seismic activity triggered by the 1999 Izmit earthquake and its implications for the assessment of future seismic risk
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DOI：
10.1046/j.0956-540x.2001.01476.x
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发表时间：
2001-07
影响因子：
2.8
通讯作者：
A. Pınar;Y. Honkura;K. Kuge
中科院分区：
文献类型：
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作者：
A. Pınar;Y. Honkura;K. Kuge
与1999年土耳其伊兹米特地震有关的主要破裂带西端的位置仍然是一个严重的问题。明确回答这个问题对于评估土耳其东马尔马拉海地区未来的地震危险性是极其重要的。在本文中，我们提出了一个有效的方法来回答这个重要的问题，统一不同种类的信息，如地震活动，震源机制解和应力变化所造成的主震到一个清晰的图像。首先指出主震释放的主要力矩为1.6r ~（10）20 Nm，范围在29.7 μ E ~ 30.5 μ E之间，然后指出东马尔马拉海地区主震后地震活动的增强应视为应力增加所触发的活动，而不是沿破裂带沿着的余震活动。我们提出了主震破裂带西延的三个断层段，每个断层段的平均应力增加，作为未来大地震的潜在地点，即（i）50 km长的Yalova-Hersek段（0.45 MPa），（ii）被称为王子群岛段（0.18 MPa）的NW-SE向右旋走滑断层，
SUMMARY A serious question has remained as to the location of the western end of the main rupture zone associated with the 1999 Izmit, Turkey, earthquake. A clear answer to this question is extremely important for the assessment of future seismic risk in the eastern Marmara Sea region, Turkey. In this paper we show an effective approach to answering this important question, unifying different kinds of information such as seismic activity, focal mechanism solutions and stress changes caused by the main shock into a clear image. We first point out that the major moment release is 1.6r10 20 N m and covered the area between 29.7uE and 30.5uE and we then claim that the enhanced seismic activity after the main shock in the eastern Marmara Sea region should be regarded as activity triggered by the increase of stress, rather than as aftershock activity along the ruptured zone. We propose three fault segments with an average stress increase on each in the western extension of the main-shock rupture zone as potential sites for future large earthquakes, namely (i) the 50 km long Yalova‐Hersek segment (0.45 MPa), (ii) the NW‐SEtrending right-lateral strike-slip fault known as the Princes Islands segment (0.18 MPa),