Preliminary field assessment of the geological evidence for the September 2016 multiple tremors was felt as far as 10 km in Nok and Chori villages in the north and northwest of Kwoi respectively. This involved systematic studies of the crack pattern and intensity on buildings, rocks and hanging walls of slopes around the area with the highest shock. The structural mapping was complemented by composite images of SPOT 5, supplementary subsurface investigations utilized aeromagnetic data, seismic data, and Digital Terrain Model (DTM) for the area. Results show that the major evidence that proved a possible link to the area of highest impact is the tremor triggered displacement of a 4 by 3 m diameter rock boulder situated about a kilometre from the Kwoi town, some 3 km from the nearest epicentre that fell through a cumulative distance of 25 m, splitting the fresh granite boulder into two and creating a high impact scar on its path. Seismic vibrations that shook the residents of Kwoi and environs (with epicentres located along a NE-SW linear traverse and remotely coinciding with buried fractures) appear to have been generated and propagated laterally from the rocks along a northwest-southeast profile. Despite the non-homogenous strengths of the impacted buildings, the near-consistency of the E-W striking walls being the most fractured gives a remote connection with the major 345° to 015° fracture patterns on the granitic plutons that shields Kwoi town to the north. Additionally, the intensity of the fractures and collapse in the buildings increased south-westwards from the perceived area of highest impact. A possible tectonic origin related to stress build up in the rocks of the area for the tremors can be insinuated thereby foreclosing the theory of a non-tectonic origin being considered in some quarters including the recent Mpape Abuja tremor of 2018. All these epicentres plot along an extrapolated trend that coincides with the Chain Fracture Zone of the North Atlantic.

中文翻译：

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尼日利亚中部科伊多处地震的初步地质证据

在Kwoi北部和西北部的Nok和Chori村庄，分别对长达10公里的地震进行了2016年9月多震的地质证据的初步现场评估。这涉及对冲击最大区域周围的建筑物，岩石和斜坡上的裂缝模式和强度进行系统研究。结构图由SPOT 5的合成图像补充，补充地下调查利用了该地区的航磁数据，地震数据和数字地形模型（DTM）。结果表明，证明可能与影响最大的区域有关的主要证据是震颤触发的直径4 x 3 m的巨石的移位，该巨石位于距Kwoi镇约1公里，距最近的震中约3 km的地方。累计距离为25 m，将新鲜的花岗岩巨石一分为二，并在其路径上产生高冲击力的疤痕。地震震动了科威特和周边地区的居民（震中位于NE-SW线性导线上，远处与埋藏的裂缝重合）似乎是从岩石沿西北偏南分布并横向传播的。尽管受灾建筑物的强度不均匀，但近乎一致的EW撞击墙破裂程度最高，与花岗岩岩体上的主要345°至015°裂缝型式遥遥相关，这些裂缝遮蔽了北部的Kwoi镇。此外，建筑物的破裂和坍塌强度从感知到的影响最大的区域向西南方向增加。