新加坡基于环境噪声的地震干涉测量基岩探测

E. Nilot, Y. Li, K. Lythgoe
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引用次数: 3

摘要

新加坡这个城市国家主要坐落在名为武吉知马地层的花岗岩基岩上。武吉知马花岗岩在新加坡中部露头,但它被埋在东部和北部被称为旧冲积层的第四纪沉积物之下。基岩深度和浅层断层影响其上构筑物的稳定性,基岩深度制约着蓄水能力和底土水分运动。需要用地震方法对基岩深度进行成像,但在新加坡人口密集的城市环境中,禁止使用爆炸方法。基于地震干涉测量的被动地震是非破坏性的,可以为我们提供估计的探测深度。我们将基于地震干涉测量的被动面波方法应用于整个新加坡岛,采用1个月的短周期节点部署,获得了三维速度结构。我们还将多通道表面波分析方法应用于线性检波器阵列,获得了古冲积层沉积物的更详细信息。通过对层析成像和MASW结果的分析,我们发现旧冲积层沉积物下的花岗岩基岩比现有地质模型所显示的更深,这可能会增加地下深层含水层中淡水的储存量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bedrock detection based on seismic interferometry using ambient noise in Singapore
The city-state of Singapore principally sits on granite bedrock known as the Bukit Timah formation. The Bukit Timah granite outcrops in the centre of Singapore, but it is buried below quaternary sediments known as the Old Alluvium formation in the east and north. Bedrock depth and faults in the shallow surface influence the stability of structures built above it, while the depth to bedrock constrains the water storage capacity and sub-soil water movement. Seismic methods are needed to image bedrock depth, however explosive methods are forbidden in the densely populated urban environment of Singapore. Passive seismic based on seismic interferometry is nondestructive and can provide us estimated detection depth. We apply the passive surface wave method based on seismic interferometry to the whole of Singapore island using a 1 month deployment of short-period nodes, to obtain the 3D velocity structure. We also obtain more detailed information in the Old Alluvium sediments by applying the MASW (multi-channel analysis of surface waves) method to linear geophone arrays. By analyzing the results from both tomography and MASW, we show that the granite bedrock beneath the Old Alluvium sediments is deeper than existing geological model suggests, which potentially increases the storage volume for fresh water in the deep underground acquifer.
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