Interseismic strain accumulation across the North Anatolian Fault from Envisat InSAR measurements
Interseismic strain accumulation across the North Anatolian Fault from Envisat InSAR measurements
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DOI：
10.1029/2010gl046443
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发表时间：
2011-03
影响因子：
5.2
通讯作者：
R. Walters;R. Holley;B. Parsons;T. Wright
中科院分区：
文献类型：
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作者：
R. Walters;R. Holley;B. Parsons;T. Wright
北安纳托利亚断层(NAF)是中东构造的主要特征，以前的几项InSAR研究已经测量到了跨越该断层的地震间变形。然而，以前的所有研究都使用从单一视线(LOS)方向获取的SAR数据，这导致了模型参数的很大不确定性，并且需要做出几个建模假设。我们首次使用上升和下降的合成孔径雷达数据测量了NAF的震间形变，这一目标以前一直受到上升数据可用性的限制。通过使用来自两个方向的合成孔径雷达数据，我们已经能够将以前研究中的滑移率和锁定深度的不确定范围减少60%，并假设没有垂直运动穿过断层，我们估计了断层正常运动和断层平行运动。这些结果支持了NAF上以水平走滑运动为主的其他证据。我们的数据与NAF在13.5-25公里锁定深度以下的滑移率为20-26毫米/年是一致的。
The North Anatolian Fault (NAF) is a major feature of Middle Eastern tectonics, and several previous InSAR studies have measured interseismic deformation across the fault. All previous studies, however, have used SAR data acquired from a single line‐of‐sight (LOS) direction, leading to large uncertainties on model parameters and necessitating several modelling assumptions to be made. We have measured interseismic deformation across the NAF using both ascending and descending SAR data for the first time, an aim that has previously been limited by the availability of ascending data. By using SAR data from two look directions we have been able to reduce the range of uncertainties in slip rate and locking depth from previous studies by 60%, and by assuming no vertical motion across the fault, we estimate both fault‐normal and fault‐parallel motion. These results support other evidence for predominantly horizontal strike‐slip motion on the NAF. Our data are consistent with a slip rate of 20–26 mm/yr below a locking depth of 13.5–25 km for the NAF.