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首页> 外文期刊>Journal of geodynamics >Estimation of optimum velocity model and precise earthquake locations in NE Aegean: Implications for seismotectonics and seismic hazard
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Estimation of optimum velocity model and precise earthquake locations in NE Aegean: Implications for seismotectonics and seismic hazard

机译：东北爱琴海最佳速度模型和精确地震位置的估计：对地震构造和地震灾害的影响

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This study relocates the seismicity in NE Aegean during the period 2011-2017 using data recorded by the Hellenic Unified Seismic Network (HUSN) in order to elucidate the relationship between seismicity and active faults in this area. P- and S-phase travel times of well-recorded events were first inverted in order to derive a minimum 1D velocity model with station delays using VELEST. Absolute locations of 4450 events were obtained by use of the nonlinear probabilistic algorithm NLLOC and the newly derived velocity model. Precise relative locations with horizontal and vertical uncertainties that do not exceed 1.2 km were calculated for 3354 events using the double-difference algorithm. The relocated seismicity delineates active faults to the south of Lesvos island, at the tip of Biga peninsula in Turkey and along the parallel strands of strike-slip faults that accommodate the westward motion of Anatolia. The comparison of the seismicity distribution with known active faults and the regional stress field shows that the strike-slip faults represent either principal shear zones, or Riedel shears oriented obliquely to the minimum stress axes. Normal faults are oriented almost perpendicular to the direction of the minimum stress axes in accordance with the transtensional deformation model. The seismogenic layer thickness derived from the depth distribution of relocated seismicity was found to be in the range of 14.8-15.8 km. By combining this thickness with geometrical characteristics of active faults and with a relationship that connects moment magnitude with rupture area, it is possible to estimate expected magnitudes of earthquakes. These magnitudes range from 6.3 to 7.2 depending on the rupture scenario that is considered for each fault. Of particular concern are the faults of Agia Paraskevi in Lesvos and Mastichochoria in Chios island that traverse densely populated areas and can produce large events with magnitudes from 6.4 to 6.9. Very little seismicity can be observed along these faults in the past 7 years, which may indicate either that they are creeping, or that they are locked and accumulate strain energy.
机译：本研究使用希腊统一地震台网（HUSN）记录的数据重新定位了爱琴海东北部2011-2017年的地震活动，以阐明该地区地震活动与活动断层之间的关系。首先将记录良好的事件的P相和S相传播时间倒转，以便使用VELEST导出具有站点延迟的最小一维速度模型。通过使用非线性概率算法NLLOC和新推导的速度模型获得了4450个事件的绝对位置。使用双差算法为3354个事件计算了水平和垂直不确定度不超过1.2 km的精确相对位置。迁移后的地震活动描绘了莱斯沃斯岛南部，土耳其比加半岛顶端的活动断层，以及沿着安纳托利亚向西运动的平行走滑断层。对已知活动断层与区域应力场的地震活动分布的比较表明，走滑断层代表主剪切带或倾斜于最小应力轴的Riedel剪切。根据断裂变形模型，正断层的取向几乎垂直于最小应力轴的方向。由重新定位的地震活动的深度分布得出的震源层厚度被发现在14.8-15.8 km的范围内。通过将此厚度与活动断层的几何特征相结合，并通过将弯矩大小与破裂区域联系起来的关系进行组合，可以估算预期的地震大小。这些大小的范围从6.3到7.2，具体取决于每个故障所考虑的破裂情况。特别值得关注的是莱斯沃斯岛的阿基亚·帕拉斯科维（Agia Paraskevi）和希俄斯岛上的马斯奇克霍里亚（Mastichochoria）的断层，这些断层穿越人口稠密的地区，并可能产生从6.4级到6.9级的大型事件。在过去的7年中，沿着这些断层几乎没有观察到地震活动，这可能表明它们正在蠕变，或者被锁定并积累了应变能。

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