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首页> 外文期刊>Journal of Volcanology and Geothermal Research >3-D imaging of the upper crust beneath the Denizli geothermal region by local earthquake tomography, western Turkey
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3-D imaging of the upper crust beneath the Denizli geothermal region by local earthquake tomography, western Turkey

机译：土耳其西部局部地震层析成像对代尼兹利地热区下方上地壳的3D成像

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摘要

The Denizli basin and its surroundings are one of the regions that have high seismic activity and rich geothermal fields in western Anatolia. In the first half of year 2000, an increasing seismic activity was observed around the Denizli basin without a large mainshock occurrence. A temporary seismic network consisting of 28 stations were deployed to observe the seismic activity in the region by The Scientific and Technological Research Council of Turkey-Marmara Research Center-Earth and Marine Science Institute (TÜBÌTAK-MAM-EMSI). In this study, one- and three-dimensional V_P and V_P/V_S structure of the Denizli basin have been determined by using the travel times of the 635 recorded earthquake data. Firstly one-dimensional inversion schema was performed to stabilize initial velocity model and to have more reliable hypocentral locations. Then an iterative and simultaneous three-dimensional inversion procedure was carried out to obtain 3-D high-resolution seismic velocity models. Furthermore to assess the solution quality of our inversion, we conducted a series of resolution tests. We concluded high-resolution 3-D V_P and V_P/V_S seismic velocity models for the upper 20 km of the crust beneath the Denizli basin and surroundings and interpreted the results in the context of known geologic and tectonic units. The resulting 3-D V_P models define the geometry of the basin, sediment thickness, and intrusive magmatic bodies as well as regions of anomalous velocity. The V_P/V_S models help to constrain the location and geometry of the faults, zones of weakness, and gas or fluid saturated formations with high pore pressure zones. All tomographic results show that there is a strong correlation between local seismicity and the high V_P and V_P/V_S anomalies. Consequently, this relationship indicates that the reason of the high seismicity in the Denizli basin depends on activity of hydrothermal system as well as tectonic regime.
机译：代尼兹利盆地及其周围地区是安纳托利亚西部地震活动活跃，地热场丰富的地区之一。在2000年上半年，在代尼兹利盆地周围观察到地震活动有所增加，而没有发生大地震。土耳其科学技术研究委员会-马尔马拉研究中心-地球和海洋科学研究所（TÜBÌTAK-MAM-EMSI）部署了一个由28个站组成的临时地震网络，以观察该地区的地震活动。在这项研究中，通过使用635个记录的地震数据的传播时间确定了代尼兹利盆地的一维和三维V_P和V_P / V_S结构。首先，执行一维反演方案以稳定初始速度模型并具有更可靠的次中心位置。然后进行了迭代和同步的三维反演程序，以获得3-D高分辨率地震速度模型。为了评估反演的解决方案质量，我们进行了一系列分辨率测试。我们得出了代尼兹利盆地和周围环境下地壳上部20 km的高分辨率3-D V_P和V_P / V_S地震速度模型，并在已知地质和构造单元的背景下解释了结果。生成的3-D V_P模型定义了盆地的几何形状，沉积物厚度，侵入岩浆体以及异常速度区域​​。 V_P / V_S模型有助于限制断层的位置和几何形状，弱化区域以及具有高孔隙压力区域的气体或流体饱和地层。所有层析成像结果均表明，当地地震活动性与较高的V_P和V_P / V_S异常之间存在很强的相关性。因此，这种关系表明，代尼兹利盆地地震活动性高的原因取决于热液系统的活动以及构造体制。

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