Earth Science Malaysia最新文献_第4页

HEAVY METALS CONTAMINATION AND DISTRIBUTION IN SURFACE WATER AND SEDIMENT OF THE ABOABO STREAM, AHAFO REGION, GHANA 加纳阿哈福地区ABOABO河地表水和沉积物中重金属污染及分布

Earth Science Malaysia Pub Date : 2020-12-29 DOI: 10.26480/esmy.01.2021.41.48

Ebenezer Asante Boafo Brobbey, B. Koomson, F. O. Agyemang

{"title":"HEAVY METALS CONTAMINATION AND DISTRIBUTION IN SURFACE WATER AND SEDIMENT OF THE ABOABO STREAM, AHAFO REGION, GHANA","authors":"Ebenezer Asante Boafo Brobbey, B. Koomson, F. O. Agyemang","doi":"10.26480/esmy.01.2021.41.48","DOIUrl":"https://doi.org/10.26480/esmy.01.2021.41.48","url":null,"abstract":"Activities of illegal small-scale miners promote continual introduction of wide pollutants into the Aboabo stream. Their toxicity poses health threats to the inhabitants of Krapoo village in the Ahafo Region, Ghana. The study assesses the impacts of illegal small-scale mining activities on the water quality of the stream. Levels of physico-chemical and microbiological parameters were determined using standard methods. Samples of sediment, water and plant were acid-digested with aqua-regia. Total Arsenic and Total Cadmium were analysed using Flame Atomic Absorption Spectrophotometer (FLAAS) whiles Total Mercury was analysed using Cold Vapour Atomic Absorption Spectrophotometer (CV-AAS). Turbidity, faecal coliforms and E-coli readings exceeded permissible limit of 5NTU and 0MPN/100ml respectively by Ghana’s Environmental Protection Agency (GS 1212) and World Health Organisation (WHO). Temperature, Electrical Conductivity and pH values were within the limit of <30oC, 1500μs/cm and 6.5-85 respectively at both seasons. Total suspended solids readings at the midstream were higher than the permissible limit. However, levels of total dissolved solutes and dissolved oxygen recorded, were below the limit. The sediments were also heavily polluted with Mercury, Arsenic and Cadmium. Alchornea cordifolia, Chromolaena odorata and Spigella anthelmia growing within the stream were taken to assess their efficiency in removing the heavy metals from the stream. It was observed that the plants species had bioaccumulation factor (BF) greater than 1 for cadmium. Alchornea cordifolia was the only plant with BF greater than 1 for mercury. The plants species are potential hyper accumulators for mercury and cadmium hence are suitable for phytoremediation.","PeriodicalId":53062,"journal":{"name":"Earth Science Malaysia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42062886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ASSESSING THE ACID MINE DRAINAGE POTENTIAL OF A STOCKPILED GOLD BEARING SULPHIDE ORE 某堆存含金硫化矿酸性矿井排水潜力评价

Earth Science Malaysia Pub Date : 2020-12-29 DOI: 10.26480/esmy.01.2021.58.64

B. Koomson, S. Fosu, B. A. Brako, E. K. Asiam, E. Yanful

引用次数: 0

THE MAJOR ELEMENTAL COMPOSITION OF MIDDLE PALEOCENE SEDIMENTS OF SOUTHERN INDUS BASIN PAKISTAN: IMPLICATION ON PROVENANCE 巴基斯坦印度河盆地南部中古新世沉积物的主要元素组成及其物源意义

Earth Science Malaysia Pub Date : 2020-12-29 DOI: 10.26480/esmy.01.2021.01.09

A. A. Hakro, Muhammad Soomar Samtio, A. S. Mastoi, Riaz Hussain Rajper

{"title":"THE MAJOR ELEMENTAL COMPOSITION OF MIDDLE PALEOCENE SEDIMENTS OF SOUTHERN INDUS BASIN PAKISTAN: IMPLICATION ON PROVENANCE","authors":"A. A. Hakro, Muhammad Soomar Samtio, A. S. Mastoi, Riaz Hussain Rajper","doi":"10.26480/esmy.01.2021.01.09","DOIUrl":"https://doi.org/10.26480/esmy.01.2021.01.09","url":null,"abstract":"The current study area is a northeastern part of Karachi arc and located in Lakhi Range and also the Southeastern part of Karachi arc which is Thar Desert. Present study is focused on Bara Formation with specifically source rock study, as it could be understand that from where these detritus were being supplied, either from Indian craton or Asian plate in Middle Paleocene time. These sediments are composed of Sandstone, Shale, Coal, and Siltstone with some traces of fossils. Ninety five samples of Middle Paleocene sediments from three localities (Ranikot, Lakhra and Thar) with five stratigraphic sections have investigated for geochemical elements identification. The studied sediments have been classified as Litharenite, Sublitharenite, arkose, Sub-arkose greywacke, Iron sand, Iron shale. PIA and CIA of studied section of basin had been facing low/low to high weathering conditions in source area. The majority of samples indicate the passive margin tectonic settings. Middle Paleocene sediments of Southern Indus Basin is concluded here as the sediments had been supplied from Indian shield rocks and it can be summarized that the Indian plate was not collided with Asia plate in Middle Paleocene time (61.6-59.2 million years age) at Southern Indus Basin of Pakistan.","PeriodicalId":53062,"journal":{"name":"Earth Science Malaysia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46198502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SOFT-SEDIMENT DEFORMATION STRUCTURES AND GRANULOMETRIC PROPERTIES DISTRIBUTION IN AJALI SANDSTONE RIDGES, WESTERN AFIKPO BASIN, UTURU, NIGERIA 尼日利亚乌图鲁阿菲克波盆地西部ajali砂岩脊软沉积变形构造及颗粒特征分布

Earth Science Malaysia Pub Date : 2020-12-29 DOI: 10.26480/esmy.02.2021.77.85

Raphael Oaikhena Oyanyan

{"title":"SOFT-SEDIMENT DEFORMATION STRUCTURES AND GRANULOMETRIC PROPERTIES DISTRIBUTION IN AJALI SANDSTONE RIDGES, WESTERN AFIKPO BASIN, UTURU, NIGERIA","authors":"Raphael Oaikhena Oyanyan","doi":"10.26480/esmy.02.2021.77.85","DOIUrl":"https://doi.org/10.26480/esmy.02.2021.77.85","url":null,"abstract":"Three Ajali sandstone ridges (L1, L2 and L3) at Uturu being quarried for construction sands were studied for soft-sediment deformation structures (SSDS) and granulometric properties distributions. SSDS that includes recumbents foresets, sands dykes, flame structures and fluid escape tubes were identified only in ridge L3. The geometry of the SSDS indicates sediment loading/density contrast, fluidization and liquefaction as the mechanisms for their formation but with liquefaction as the most dominant mechanism. Gran size analysis and granulometric curves properties calculations show that: Mean grain size ranged from fine (1.18 ɸ) to medium (2.57 ɸ); Sorting ranged from rarely poorly sorted (1.13ɸ) to well sorted (0.37ɸ) but with mean values in each ridge as moderate sorted; Skewness ranged from strongly fine skewed (1.0) to strongly coarse skewed (-1.57); and Kurtosis ranged from very platykurtic (0.27) to very leptokurtic (2.0) but with sands of ridge L3 mainly very platykurtic. Granulometric curves and bivariate plot of properties indicate fluvial deposition with rare marine influence. Results show that there is no significant variation in sediment properties and depositional environments across the three ridges. The localization of SSDS and non-proximity to any fault suggest that liquefaction, as the dominant mechanism for soft-sediment deformation, was not triggered by an earthquake. Possible mechanisms include rapid sediment loading, localised sudden subsidence induced by loading of localised oxidized compressible peats and coal; and increased in sediments’ water saturation via localised groundwater seepage. Fine grains, well sorting, fine to strongly skewed very platykurtic characteristics of sediments made it more susceptible to liquefaction.","PeriodicalId":53062,"journal":{"name":"Earth Science Malaysia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44002244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

TRANSITION OF LULC AND FUTURE PREDICTIONS BY USING CA-MARKOV CHAIN MODEL (A CASE STUDY OF METROPOLITAN CITY LAHORE, PAKISTAN) 基于CA-MARKOV链模型的LULC转换与未来预测（以巴基斯坦拉合尔市为例）

Earth Science Malaysia Pub Date : 2020-10-06 DOI: 10.26480/esmy.02.2020.146.151

Faisal Mumtaz, Yu Tao, Waqar Bashir, M. Kareem, Wang Gengke, Lingling Li, Barjeece Bashir

{"title":"TRANSITION OF LULC AND FUTURE PREDICTIONS BY USING CA-MARKOV CHAIN MODEL (A CASE STUDY OF METROPOLITAN CITY LAHORE, PAKISTAN)","authors":"Faisal Mumtaz, Yu Tao, Waqar Bashir, M. Kareem, Wang Gengke, Lingling Li, Barjeece Bashir","doi":"10.26480/esmy.02.2020.146.151","DOIUrl":"https://doi.org/10.26480/esmy.02.2020.146.151","url":null,"abstract":"Land use and land cover transition is continue process due to various anthropogenic activities and altering the landscape pattern of the metropolitan area of Lahore over the last two decade. LULC has been emerging masses of environmental problems including land use issues for the inhabitants, city planners, and managers. This research has been focused on the LULC change from 1998 to 2018 and their impact to forecast the landscape pattern of 2023 and 2028 in metropolitan area of Lahore. Numerous satellite imageries including land sat 5 TM and landsat 8 OLI has been undergone by supervised classification for the preparation of LULC map, land change moderler MCL to calculate the transition in LULC and CA-Markov model for predicting upcoming transitions. Results have validated by transition matrix, Google Earth data and kappa statistics. Derived results has depicted the decreased in water bodies 2.70% to 0.60%, vegetation 24.90% to 22.60% and barren land 42.50% to 35.70% and increased in built up area 29.80 % to 41% between 1998 to 2018. Finding clearly represents the loss of ecological and barren landscape over the last two decade and therefore urban expansion will likely to continue the change in landscape. This study will provide a baseline reference to urban planners and policymakers to make informed decision for management of land resources, urban land planning and for maintain sustainable land development.","PeriodicalId":53062,"journal":{"name":"Earth Science Malaysia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41946279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

GEOCHEMICAL ASSESSMENT OF TRACE METALS IN SOIL, STREAM WATER AND SELECTED FOOD CROPS AT KIBI GOLDFIELDS ENVIRONMENT, GHANA 加纳kibi金矿环境中土壤、水流和选定粮食作物中微量金属的地球化学评价

Earth Science Malaysia Pub Date : 2020-09-23 DOI: 10.26480/esmy.01.2020.71.76

Douglas Baah Siaw, S. Gidigasu, A. Andrews, E. Gikunoo, G. Foli

{"title":"GEOCHEMICAL ASSESSMENT OF TRACE METALS IN SOIL, STREAM WATER AND SELECTED FOOD CROPS AT KIBI GOLDFIELDS ENVIRONMENT, GHANA","authors":"Douglas Baah Siaw, S. Gidigasu, A. Andrews, E. Gikunoo, G. Foli","doi":"10.26480/esmy.01.2020.71.76","DOIUrl":"https://doi.org/10.26480/esmy.01.2020.71.76","url":null,"abstract":"This study assesses environmental receptors impacted by alluvial gold mining at Kibi Goldfields Limited in the Eastern region of Ghana to establish trace metals contamination risk. Specific objectives are to determine concentrations of (1) As, Cr, Ni and Pb in soils, drainage and food crops, using X-ray fluorescence, (2) Cl- in drainage using standard methods. Mean concentrations of As, Cr and Ni in soils are higher at impacted sites than control sites; while Pb and As concentrations in drainage exceeds the maximum contamination guideline values in drinking water. Using Cl- as a conservative tracer, As and Pb are adsorbing from water, while Cr and Ni are desorbing into water. In the food crops, bioaccumulation factors of As and Ni are profound at the impacted site than control sites; Except Cr in cocoyam at impacted sites, translocation factors are negligible in the food crops. Cr bioaccumulates in in cocoyam and plantain at the control site, while Ni bioaccumulates in only plantain at the impacted sites. Overall, the metal contamination is of concern in the receptors, except Pd in plants. Results from this study can be used for trace metals risk assessment in the environment.","PeriodicalId":53062,"journal":{"name":"Earth Science Malaysia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41553347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

GEOCHEMICAL CHARACTERISTICS OF GOLD-BEARING GRANITOIDS AT AYANFURI IN THE KUMASI BASIN, SOUTHWESTERN GHANA: IMPLICATIONS FOR THE OROGENIC RELATED GOLD SYSTEMS 加纳西南部库马西盆地ayanfuri含金花岗岩类地球化学特征:造山带相关金系统的指示意义

Earth Science Malaysia Pub Date : 2020-06-23 DOI: 10.26480/esmy.02.2020.127.134

T. K. Agbenyezi, G. Foli, S. Gawu

{"title":"GEOCHEMICAL CHARACTERISTICS OF GOLD-BEARING GRANITOIDS AT AYANFURI IN THE KUMASI BASIN, SOUTHWESTERN GHANA: IMPLICATIONS FOR THE OROGENIC RELATED GOLD SYSTEMS","authors":"T. K. Agbenyezi, G. Foli, S. Gawu","doi":"10.26480/esmy.02.2020.127.134","DOIUrl":"https://doi.org/10.26480/esmy.02.2020.127.134","url":null,"abstract":"This study investigates auriferous granitoids from the Esuajah and Fobinso pits within the Ayanfuri environment in the Paleoproterozoic Kumasi basin. The aim is to establish the geochemical characteristics of the granitoid gold ores and the possible deposit type which may influence mineral project development. 13 major and 51 trace elements were analyzed using XRF and ICP-MS devices, respectively. The granitoids are mainly classified as granodiorite that crystallized from a calc-alkaline magma series. The Fobinso granodiorite derived from the partial melting of the Birimian metasedimentary rocks, while the Esuajah granitoid derived from igneous rock melts. The granitoid are linked to magma source depleted in mantle material that contains crustal components through subduction processes. Major oxides of the granitoid vary lowly from the average background values derived for basin type granitoid in such terrains. Generally, the granitoid are enriched in Large Ion Lithophile Elements (LILE), while High Field Strength Elements (HFSE) and base metals are within background values when compared to Primitive Mantle (PM) values. Gold mineralisation is associated with Ag, As, Bi, Sb, Te, Pb and S in the peraluminous granitoids. Geochemical characteristics and field observations identify the deposit style as an orogenic related gold deposit type.","PeriodicalId":53062,"journal":{"name":"Earth Science Malaysia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46756485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

PETROGRAPHY AND GEOCHEMISTRY OF SOME PALEOPROTEROZOIC GRANITOIDS AT THE NORTH-EASTERN MARGIN OF THE KUMASI BASIN IN GHANA 加纳库马西盆地东北缘部分古元古代花岗岩的岩石学和地球化学

Earth Science Malaysia Pub Date : 2020-06-18 DOI: 10.26480/esmy.02.2020.118.126

B. A. Brako, G. Foli, Kofi Adomako Ansah, D. Aikins, Solomon Dery, S. Gawu

{"title":"PETROGRAPHY AND GEOCHEMISTRY OF SOME PALEOPROTEROZOIC GRANITOIDS AT THE NORTH-EASTERN MARGIN OF THE KUMASI BASIN IN GHANA","authors":"B. A. Brako, G. Foli, Kofi Adomako Ansah, D. Aikins, Solomon Dery, S. Gawu","doi":"10.26480/esmy.02.2020.118.126","DOIUrl":"https://doi.org/10.26480/esmy.02.2020.118.126","url":null,"abstract":"This study investigates basin-type granitoid samples from the north-eastern margin of the Kumasi Basin in Ghana to establish their source and geodynamic setting. Petrographic analysis, TAS and A/NK-A/CNK plots classify the granitoids as metaluminous quartz diorite, metaluminous granodiorite, and peraluminous monzogranite; and exhibiting I-type signatures. These rocks are formed by magma differentiation and/or partial melting at various stages. Distribution patterns of incompatible elements and the positive Eu/Eu* anomalies of 1.15 and 1.47 exhibited by quartz diorite and granodiorite, respectively, the values suggest the rocks crystallized from melts formed in a water-saturated environment. The negative Eu/Eu* anomaly exhibited by monzogranite indicate fractionation of plagioclase in the final stages of the magma evolution. The water-rich environment is probably due to dewatering of the basin’s foreland volcaniclastic sediments during regional subsidence, burial and metamorphism. K2O enrichments and wide variations suggest that the granodiorite and monzogranite are formed from fractional crystallization and/or crustal assimilation of the continental crust by under-plating dioritic magma. The higher Al2O3/TiO2 enrichment and the shift from metaluminous to peraluminous in the monzogranite suggest a longer residence time within the continental crust, during which fractional crystallization and the assimilation of pre-existing crustal components into the dioritic magma that resulted in the formation of the monzogranite. The study requires replication at other areas within the basin to generate enough data to enhance metallogenic studies in the terrain.","PeriodicalId":53062,"journal":{"name":"Earth Science Malaysia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44244381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

DARCY-AND PORE-SCALE ISSUES ASSOCIATED WITH MULTI-PHASE FLUID FLOW THROUGH A PETROLEUM RESERVOIR 与油气储层中多相流体流动有关的达西和孔隙尺度问题

Earth Science Malaysia Pub Date : 2020-06-10 DOI: 10.26480/esmy.02.2020.108.117

S. Govindarajan, A. Mishra, Abhishek Kumar

{"title":"DARCY-AND PORE-SCALE ISSUES ASSOCIATED WITH MULTI-PHASE FLUID FLOW THROUGH A PETROLEUM RESERVOIR","authors":"S. Govindarajan, A. Mishra, Abhishek Kumar","doi":"10.26480/esmy.02.2020.108.117","DOIUrl":"https://doi.org/10.26480/esmy.02.2020.108.117","url":null,"abstract":"This manuscript primarily focuses on the constraints associated with the extended version of Darcy’s law that is used to describe the multiphase flow through a porous media; and in particular, a petroleum reservoir. This manuscript clearly brings out the basics associated with the usage of Darcy’s law, and reasons out the inapplicability of the Navier-Stokes Equation in order to describe the momentum conservation in a typical petroleum reservoir. Further, this work highlights the essence of continuum-based Darcy’s macroscopic-scale equation with that of Navier-Stokes’s microscopic-scale equation. Further, the absence of capillary forces in original Darcy’s equation and extending the same by considering the concept of ‘capillary pressure’ in order to accommodate the multi-phase flow has several critical constraints associated with it. In this manuscript, all these constraints or limitations have been posed in the form of a list of basic queries that need to be addressed or at least to be understood with clarity, when applying the multi-phase fluid flow equations associated with a petroleum reservoir. This study is limited to an oil-water two-phase system.","PeriodicalId":53062,"journal":{"name":"Earth Science Malaysia","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41522813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

AMBIENT SEISMIC NOISE FOOTPRINTS AND SPECTRA IN THE MIDDLE BENUE TROUGH, NIGERIA 尼日利亚中部海槽环境地震噪声足迹和频谱

Earth Science Malaysia Pub Date : 2019-10-25 DOI: 10.26480/esmy.02.2019.23.31

C. N. C. Mbachi, E. Uko, C. L. Eze, Iyeneomie Tamunobereton-ari, Dorathy B. Umoetok, Allu A. Umbugdau

{"title":"AMBIENT SEISMIC NOISE FOOTPRINTS AND SPECTRA IN THE MIDDLE BENUE TROUGH, NIGERIA","authors":"C. N. C. Mbachi, E. Uko, C. L. Eze, Iyeneomie Tamunobereton-ari, Dorathy B. Umoetok, Allu A. Umbugdau","doi":"10.26480/esmy.02.2019.23.31","DOIUrl":"https://doi.org/10.26480/esmy.02.2019.23.31","url":null,"abstract":"Ambient noise was analysed from a two-dimensional (2D) seismic data acquired in the Middle Benue Trough, Nigeria for the purpose of characterizing the ambient seismic noise. Sercel 428XL recording instrument was deployed on 3 traverse lines where dynamite explosive sources and geophone detectors were used. The acquired data was processed using frequency wavenumber (FK) and wild amplitude attenuation (WAA) algorithms. The dominant amplitude of the primary reflection ranges between -20dB and -10dB, while those of the ambient seismic noise varies between -42dB and -3dB. The primary reflections have dominant frequency varying from 6Hz to 75Hz while that of ambient seismic noise varies between 4Hz and 70Hz. Analysis of the noise shows two distinct ground roll modes with velocities between 400 ms -1 and 810 ms -1 both of which are dispersive with wavelength (λ) of 61.5m and peak frequency at 6.5Hz. Analysis of passive noise records acquired showed that ambient seismic (background) noise level excluding source-generated noise average of 91.56% are below 25µV, which is the tolerance noise level limit. The combination of frequency wavenumber FK and WAA filters effectively attenuated the surface waves especially ground rolls and other high amplitude noise making the primary reflection very visible and better enhanced. The filtered amplitude values estimated from signal-to-noise (SNR) analysis using cross correlation (XC) method are much higher than the values of the unfiltered amplitudes indicating that SNR are highest when noises are attenuated from the data than when noise algorithm is not applied to the data. The attributes of these seismic noises will provide further information and solution for their suppression during","PeriodicalId":53062,"journal":{"name":"Earth Science Malaysia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47296297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1