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首页> 外文期刊>Pure and Applied Geophysics >A New Passive Tomography of the Aigion Area (Gulf of Corinth, Greece) from the 2002 Data Set
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A New Passive Tomography of the Aigion Area (Gulf of Corinth, Greece) from the 2002 Data Set

机译：根据2002年数据集，对Aigion地区（希腊科林斯湾）进行的新的被动层析成像

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We present the results of a tomographic study performed in the framework of the 3F-Corinth project. The aim of this work is to better understand the rifting process by imaging the crustal structure of the western Gulf of Corinth. Forty-nine stations were deployed for a period of six months, allowing us to monitor the microseismicity. Delayed P and S first-arrival times have been simultaneously inverted for both hypocenter locations and 3-D velocity distributions. We use an improved linearized tomography method based on an accurate finite-difference travel-time computation to invert the data set. The obtained Vp and Vs models confirm the presence of a two-layer vertical structure characterized by a sharp velocity gradient lying at 5–7 km depth, which may be interpreted as a lithological contrast. The shallower part of the crust (down to 5 km depth) is controlled by the N-S extension and lacks seismicity. The deeper part (7–13 km depth) matches the seismogenic zone and is characterized by faster and more heterogeneous anomalies. In this zone, the background seismicity reveals a low-angle active surface dipping about 20° toward the north and striking WNW-ESE. The position of this active structure is consistent with both high Vp/Vs and low Vp.Vs anomalies identified at 8–12 km depth and suggesting a highly fracturated and fluid-saturated zone. Both the geometry of the active structure beneath the gulf and the presence of fluids at 8–12 km depth are in accordance with a low-angle detachment model for the western part of the Gulf of Corinth.
机译：我们介绍了在3F-Corinth项目框架内进行的层析成像研究的结果。这项工作的目的是通过对科林斯湾西部的地壳结构成像，以更好地了解裂谷过程。部署了49个站，为期六个月，这使我们能够监测微地震。对于震中位置和3-D速度分布，已同时延迟了P和S的首次到达时间。我们使用基于精确的有限差分行程时间计算的改进的线性层析成像方法来反转数据集。所获得的Vp和Vs模型证实了两层垂直结构的存在，其特征是在5-7 km深度处存在急剧的速度梯度，这可以解释为岩性对比。地壳的较浅部分（低至5 km的深度）由N-S扩展控制，缺乏地震作用。较深的部分（深度7-13 km）与地震发生带相匹配，其特征是异常更快，更不均匀。在该区域，背景地震活动显示出一个低角度的活动面，向北倾斜约20°，并撞击WNW-ESE。此活动结构的位置与在8–12 km深度处识别出的高Vp / Vs和低Vp.Vs异常一致，表明存在高度破裂和流体饱和的区域。海湾下方活动结构的几何形状和8-12 km深度的流体均符合科林斯湾西部的低角度分离模型。

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