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Dead sea basin imaged by ambient seismic noise tomography

机译：环境地震噪声层析成像成像的死海盆地

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In the framework of the Dead Sea Integrated Research project (DESIRE), 59 seismological stations were deployed in the region of the Dead Sea Basin. Twenty of these stations recorded data of sufficiently high quality between May and September 2007 to be used for ambient seismic noise analysis. Empirical Green's functions are extracted from cross-correlations of long term recordings. These functions are dominated by Rayleigh waves, whose group velocities can be measured in the frequency range from 0.1 to 0.5 Hz. Analysis of positive and negative correlation lags of the Green's functions makes it possible to identify the direction of the source of the incoming energy. Signals with frequencies higher than 0.2 Hz originate from the Mediterranean Sea, while low frequencies arrive from the direction of the Red Sea. Travel times of the extracted Rayleigh waves were measured between station pairs for different frequencies, and to mographically inverted to provide independent velocity models. Four such 2D models were computed for a set of frequencies, all corresponding to different sampling depths, and thus together giving an indication of the velocity variations in 3D extending to a depth of 10 km. The results show low velocities in the Dead Sea Basin, consistent with previous studies suggesting up to 8 km of recent sedimentary infill in the Basin. The complex structure of the western margin of the Basin is also observed, with sedimentary infill present to depths not exceeding 5 km west of the southern part of the Dead Sea. The high velocities associated with the Lisan salt diapir are also observed down to a depth of ~5 km. The reliability of the results is confirmed by checkerboard recovery tests.
机译：在死海综合研究项目（DESIRE）的框架内，在死海盆地地区部署了59个地震台站。这些台站中有20个在2007年5月至9月之间记录了足够高质量的数据，可用于环境地震噪声分析。格林经验函数是从长期记录的互相关中提取的。这些功能主要由瑞利波控制，瑞利波的群速度可以在0.1至0.5 Hz的频率范围内测量。通过分析格林函数的正负相关滞后，可以确定输入能量来源的方向。频率高于0.2 Hz的信号来自地中海，而低频则来自红海方向。在不同频率的电台对之间测量提取的瑞利波的传播时间，并进行影像学倒转以提供独立的速度模型。针对一组频率计算了四个这样的2D模型，所有这些模型都对应于不同的采样深度，因此一起给出了延伸到10 km深度的3D速度变化的指示。结果表明，死海盆地的流速较低，与先前的研究一致，表明该盆地最近的沉积物充填达到了8 km。还观察到流域西缘的复杂结构，在死海南部以西不超过5 km处存在沉积物填充物。还观察到了与利桑盐底盘有关的高速，直到约5 km的深度。结果的可靠性通过棋盘格恢复测试得到证实。

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