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Integrated geophysical investigation of recent earth tremors in Nigeria using aeromagnetic and gravity data.
Environmental Monitoring and Assessment ( IF 3 ) Pub Date : 2020-05-09 , DOI: 10.1007/s10661-020-08339-6
Ema M Abraham 1 , Elijah E Nkitnam 1 , Onyekachi E Itumoh 1
Affiliation  

Understanding the tectonics at active sites of recent seismic activities in Nigeria is fundamental towards disaster mitigation and emergency planning. We apply geophysical techniques of gravity and magnetic methods to investigate crustal depths, subsurface geologic faults and fractures, and the overall subsurface interaction at Mpape region and environs. Estimated depths to the bottom of magnetic crust (basal depths) range between 11.0 and 11.4 km at the Mpape region and decrease further southward towards Guabe town. This signifies the depth range of the active crust within the region. Comparative deeper basal depths (15.0-16.2 km) were obtained at locations farther from Mpape-Guabe towns at Nasarawa, Rubochi, and Fuka regions, showing a more stable region away from Mpape region. Computed Moho depths from gravity data show deeper depths at the Mpape region (~ 34.1 km) suggesting that the active crust exists in the upper crust. Two-dimensional modeling analysis along a profile taken across the Mpape region shows a conspicuous subsurface basement intrusion at the Mpape region with deep faults and fractures reaching depths of 7-14 km. Shallow basal depths at the Mpape region resulting from significant subsurface intrusion and concentrated subsurface faults at the intruded region may be responsible for the instability of the Mpape region. The most affected area is located within the Mpape-Guabe towns. We recommend the establishment of seismic monitoring facilities in this area for effective monitoring and evaluation.

中文翻译:

利用航磁和重力数据对尼日利亚最近发生的地震进行的综合地球物理调查。

了解尼日利亚最近地震活动活跃地区的构造对减灾和应急计划至关重要。我们应用重力和磁方法的地球物理技术研究地壳深度,地下地质断层和裂缝,以及Mpape地区和周围环境的整体地下相互作用。在Mpape地区,估计到地壳底部的深度(基本深度)在11.0至11.4 km之间,并向南向Guabe镇减小。这表示该区域内活动地壳的深度范围。在距Nasarawa,Rubochi和Fuka地区的Mpape-Guabe城镇较远的位置获得了比较深的基础深度(15.0-16.2 km),这表明远离Mpape地区的区域更稳定。根据重力数据计算出的莫霍面深度显示出Mpape地区的深度更深(约34.1 km),表明活动地壳存在于上地壳中。沿Mpape地区剖面进行的二维建模分析显示,Mpape地区地下地下基底明显突出,断层较深,裂缝深度达到7-14 km。Mpape区域的浅基底深度是由明显的地下侵入和侵入区域集中的地下断层引起的,可能是Mpape区域的不稳定性的原因。受灾最严重的地区位于Mpape-Guabe城镇内。我们建议在该地区建立地震监测设施,以进行有效的监测和评估。沿Mpape地区剖面进行的二维建模分析显示,Mpape地区地下地下基底明显突出,断层较深,裂缝深度达到7-14 km。Mpape区域的浅基底深度是由明显的地下侵入和侵入区域集中的地下断层引起的,可能是Mpape区域的不稳定性的原因。受灾最严重的地区位于Mpape-Guabe城镇内。我们建议在该地区建立地震监测设施,以进行有效的监测和评估。沿Mpape地区剖面进行的二维建模分析显示,Mpape地区地下地下基底明显突出,断层较深,裂缝深度达到7-14 km。Mpape区域的浅基底深度是由明显的地下侵入和侵入区域集中的地下断层引起的,可能是Mpape区域的不稳定性的原因。受灾最严重的地区位于Mpape-Guabe城镇内。我们建议在该地区建立地震监测设施,以进行有效的监测和评估。Mpape区域的浅基底深度是由明显的地下侵入和侵入区域集中的地下断层引起的,可能是Mpape区域的不稳定性的原因。受灾最严重的地区位于Mpape-Guabe城镇内。我们建议在该地区建立地震监测设施,以进行有效的监测和评估。Mpape区域的浅基底深度是由明显的地下侵入和侵入区域集中的地下断层引起的,可能是Mpape区域的不稳定性的原因。受灾最严重的地区位于Mpape-Guabe城镇内。我们建议在该地区建立地震监测设施,以进行有效的监测和评估。
更新日期:2020-05-09
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