Series-1 Jan. – Feb. 2021 Issue Statistics
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| Paper Type | : | Research Paper |
| Title | : | Seismic noise characteristics of Maitri broadband seismic station in Antarctica: using power spectral density estimation |
| Country | : | India |
| Authors | : | Satish Saha || D. Srinagesh |
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: | 10.9790/0990-0901010111  |
Abstract: The seismic noise analysis is very useful tool for characterizing the performance of the existing seismic stations and it should be used as a first step in reducing the noise level in seismic signals. The main indicator of the quality of a seismic station is the level of the noise recorded in the absence of seismic signal. The level of noise recorded on seismometer can be reduced by locating the station away from human activity, selecting good geology and ensuring good seismic vault design and constructed at site, including thermal insulation and excellent ground coupling of broadband seismometer. In the year 1998 an ice free, rocky area on Schimacher Oasis was selected to build the Indian second research station "Maitri" (70°45'52" S and 11°44'03" E) in East Antarctica. The seismic background noise is studied at Maitri broadband seismic station operated in continuous mode till date.......
Keywords: Seismic Noise Analysis, Maitri, human activity, Antarctica, Power Spectral Density (PSD), Probability Density Function (PDF).
[1]. Add el-aziz KhairyAbd el-aal, "Very broadband seismic background noise analysis of permanent good seismic stations", J Seismo (2013) 17:223-237,doi 10.1007/s10950-012-9308-5.
[2]. Satish Saha, "Digital broadband seismograph setup to study the seismicity in Maitri Antarctica region", Journal of applied Geology and Geophysics, doi 10.9790/0990-0403010106
[3]. B. A Wibowo ,N.Heryandoko and Rohadi, "Waveform Spectral Analysis to determining the CTBTO'S seismic stations noise characteristics in Indonesia", The 5th International Symposium on Earthquake and Disaster Mitigation.AIP Conf. Proc 173o: 020007-1-020007-7.doi 10/1063/1/4947375.
[4]. Santosh Kumar, Sumer Chopra,Pallabee Choudhary,A.P.Singh,R.B.S.Yadav and B.K. Rastogi, " Ambient noise levels in Gujarat State (India) seismic network", Geomatics, Natural Hazards and Rish, Vol.3, No.4, November 2012,342-354.
[5]. Satish Saha,R.Vijayaraghavan and Joshi Catherine, " Operation and maintenance of Seismological station at Maitri during 33rd Indian Scientific Expedition to Antarctica, doi 10.13140/RG.2.2.16372.65925.
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| Paper Type | : | Research Paper |
| Title | : | Application of One Dimensional Geophysical Investigation on Proposed Dam Project, Iyah Gbede, Kogi State, Nigeria |
| Country | : | Nigeria |
| Authors | : | OlabodeO.O. || OyanamehO.E. || Dorcas Idowu || Korode, A. I || OsisanyaW.O |
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: | 10.9790/0990-0901011220 |
Abstract: Foundation designs planning is very critical in engineering works, therefore geophysical investigation was carried out for foundation design of a proposed Dam at IyahGbede, Ijumu Local Government Area of Kogi State with a view to deduce and enhance the knowledge of the near subsurface integrity of the area for engineering structures.Electrical Resistivity method was adopted to conduct the survey for detail and distinct result. The aim of the exercise was to determine the soil properties of the subsoil layers that constitute the foundation soils and their competence as foundation soils for a dam site establishment. Traverse lines were established along E-W direction and six (6) Vertical Electrical Sounding points (VES) which is one dimensional in prospect, werelaid which to reveal the subsurface property of the area.The VES curves types are AA,AH, HA and KH,which depicts that the investigated site is competent for the proposed dam project.
Keywords: Electrical Resistivity Method, Dam Project, Foundation Design, Geophysical Investigation
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| Paper Type | : | Research Paper |
| Title | : | Electrical resistivity imaging and magnetic surveys for evaluating highway failures along Ogbagi – Ikare, Southwestern Nigeria |
| Country | : | Nigeria |
| Authors | : | Muraina Zaid Mohammed |
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: | 10.9790/0990-0901012131 |
Abstract: A geophysical survey, involving electrical resistivity imaging and magnetic method was carried out for evaluating the cause(s) of the three failed segments along Ikare – Ogbagi highway, southwestern Nigeria. A total of fifty - six magnetic data points, three dipole-dipole resistivity and nine Schlumberger vertical electrical sounding datasets were acquired along three traverses across the failed and stable portions of the road. Results showed two major magnetic responses; high and low zones identified as shallow basement/competent or high magnetized weathering resistant strata and weak zones/low weathering resistant strata respectively. High magnetic amplitudes were observed between 0 – 15 m / 25 - 30 m and low between 15 – 25 m / 30 - 100 m for traverse I; high between 40 -- 50 m with a peak at 45 m position and low between stations 0 - 40 m / 55 - 65 m....
Keywords: Geoelectrical, geological, highway, resistivity, stable, substrate
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