Body‐wave passive seismic interferometry revisited: mining exploration using the body waves of local microearthquakes
Body‐wave passive seismic interferometry revisited: mining exploration using the body waves of local microearthquakes
复制标题
体波被动地震干涉测量再探讨：利用局部微地震体波进行采矿勘探
DOI：
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发表时间：
2019
影响因子：
2.6
通讯作者：
D. Draganov
中科院分区：
文献类型：
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作者：
K. Polychronopoulou;A. Lois;D. Draganov
随着全球对矿产资源的需求不断增加，这些资源的可开采浓度往往变得越来越复杂，采矿业不断寻求创新和具有成本效益的勘探解决方案。在此背景下，在智能勘探行动的框架内，在希腊中部的Gerolekas铝土矿矿区启动了一项综合被动地震勘探。安装了一个由129个三分量短周期台站组成的被动地震台网，并连续运行了4个月。所获得的数据允许检测约1000微震非常小的震级（持续时间震级范围为-1.5和2.0），位于研究区域内或在一个非常近的距离。我们使用这种微震活动性作为输入，用于被动地震干涉测量法的应用，利用所定位的微震的体波（P波和S波尾波）进行反射反演。我们通过自相关零偏移虚拟反射响应检索，每个组件，每个记录站下面。我们使用反射处理技术处理所获得的结果，以获得P波和S波的零偏移距时间和深度剖面。在本工作的背景下，我们评估所获得的深度部分之一，使用现有的地震线通过Gerolekas被动地震网络，我们进行正向建模，以评估所获得的结果的质量和价值。我们确认，被动地震反射波干涉测量法可以构成一种具有成本效益和环境友好的创新勘探方法，特别是在困难的勘探环境中。
As the global need for mineral resources is constantly rising and the exploitable concentrations of these resources tend to become increasingly complex to explore and exploit, the mining industry is in a constant quest for innovative and cost‐effective exploration solutions. In this context, and in the framework of the Smart Exploration action, an integrated passive seismic survey was launched in the Gerolekas bauxite mining site in Central Greece. A passive seismic network, consisting of 129 three‐component short‐period stations was installed and operated continuously for 4 months. The acquired data permitted detection of approximately 1000 microearthquakes of very small magnitude (duration magnitude ranging between –1.5 and 2.0), located within or at a very close distance from the study area. We use this microseismicity as input for the application of passive seismic interferometry for reflection retrieval, using the body waves (P‐ and S‐wave coda) of the located microearthquakes. We retrieve by autocorrelation zero‐offset virtual reflection responses, per component, below each of the recording stations. We process the acquired results using reflection processing techniques to obtain zero‐offset time and depth sections, both for P‐ and for S‐waves. In the context of the present work, we evaluate one of the acquired depth sections, using an existing seismic line passing through the Gerolekas passive seismic network, and we perform forward modelling to assess the quality and value of the acquired results. We confirm that passive seismic reflected‐wave interferometry could constitute a cost‐effective and environmentally friendly innovative exploration alternative, especially in cases of difficult exploration settings.