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Geophysical Survey



SONARSEA, performs methods of seismic, electrical resistivity, magnetic, gravity, microtremor and ground penetration radar (GPR) within the scope of geophysical surveys.

Seismic Survey

SONARSEA, performs within the scope of seismic survey;

  • Seismic Refraction Method,
  • Seismic Reflection Method,
  • Multi-channel analysis of surface waves (MASW),
  • Refraction Microtremor REMI,
  • Up-hole, Down-hole, Cross-hole is performed.

Seismic surveys;

  • Realization of geotechnical calculations by calculating dynamic-elastic parameters of rock and soil,
  • Determination of bedrock depth and identification of geological layers,
  • Identification of excavability and removability degree determining P wave velocity,
  • Investigation of underground riches,

Evaluation of geological and tectonic evolution detecting stratigraphy.

  • Mineral exploration,
  • Determination of falut lines,
  • Sediment thickness studies,
  • Bedrock investigation,
  • Continental drift and seafloor spreading issues is offered solutions.

    Gravity Survey

    In gravity method, the gravity acceleration (g) generating density differences of objects on underground is investigated. It is the one method between geophysical methods that can calculate mass. SONARSEA, measures changes of gravity acceleration with the help of gravimetry and evaluates aimed at determination of underground condition with the gained values from measurements. In gravity surveys are tried to interprete geological components causing gravity anomaly. Because of especially in gravity method choosen on mineral exploration is expected detection of a anomaly, the gravity method will not deliver desired results in case of there is not density difference between mineral stratum and surrounding rocks. SONARSEA, with gravity method,

  • Determination of geothermal areas,
  • Investigation of magmatic mass boundary in basin covered up with young geological layer,
  • Revealing major fault systems,
  • In petroleum exploration, offer solutions aimed at estimation of geological structures of petroleum-related.  

    Ground Penetration Radar Survey (GPR) 

    Ground penetration radar method, is a high frequency electromagnetic (EM) geophysical method used on near surface shallow research operations. The most important advantage of method is that can be collected data on high-sensitivity and very fast. Because of constitution any damage and doing visualization of 2D-3D, this method is lead of preferred geophysical methods nowadays. SONARSEA, offers appreciate solutions evaluating together criterias of aim of the project, expected resolution and investigation depth. The surveys are conducted selecting appreciate antenna frequency determined according to the criterias. SONARSEA, with ground penetration radar method;

  • Identification of graves, walls, foundations, temples, location and similar historical remains in archaeological works,
  • Determination of UXO unexploded ordnance and mine 
  • Determination of buried pipeline on underground, the old industrial waste areas, fuel and water tanks,
  • Detection and mapping of fault, fracture, crack and karstic cavity structures 
  • Mapping weathered zones and fittings detecting strength of the walls within tunnels, tube gates and mine galleries 

    Microtremor Survey

    Earth; due to effects such as winds, waves and sea traffic are vibration-induced as natural and artificial. The seismic noises in micron size is called microtremor or microvibration according to origin of period and amplitude. Microtremors originate natural impact such as natural wind, ocean waves, geothermal reactions, low-magnitude earthquakes beside, cultural noise that it is called especially traffic movements caused in mobility of people's lives. SONARSEA performs ground penetration radar method the following engineering studies:

  • Determination of ground-structure relationship on earthquake-resistant building design,
  • Identification of ground dominant vibration period and ground growth factor,
  • Detection and analyzation of wind, wave and cultural noises,
  • Classification of regions according to earthquake sensitivity,
  • Detection of ground-structure behaviors during the tremor.

Geological and Geotechnical Survey



SONARSEA, conducts drilling operations, test pit, paleoseismological studies within the scope of geological and geotechnical surveys.

Drilling operations are performed in:

  • Procuration of data used to reveal physical-mechanical features of layers and their behavior characteristics

  • Revealing of changes of horizontal and vertical direction 

  • Identification of underground water level

  • Collection of conforming to standarts disturbed/undisturbed for performing laboratory test identifying all data is used on geotechnical parameters and geohazard analysis. 

Test pits,

Test pits allows of collecting sample and field test, provide analyzing soil features more transparently on vertical and horizontal directions. However, it has a place in determining discontinuity structures on soil. 

Test pits are preferred in observable location of rock units in very shallow depths and they give an opportunity to investigate rocks directly, identify possible crack and fractures.

Paleoseismological Surveys,

Whether or not there is a fault moving on Holosen epoch in project area or big-scaled areas, if any, developed in this study based upon recent earthquakes are produced by this fault and their historical records; in the project area sufficient number of ditchs, geophysical methods and literature information is evaluated together and acquired informations such as type of fault, its slope, transposition quantity.

Geochemical survey



SONARSEA, carries out soil gas measurement within the scope of geochemical surveys. The number of points will be measured is identified according to the size of the project area. Measurements are taken with the wide point interval in large-scale field, in locations where detection of anomalies the number of points and point interval are measured again and mapped by thickening. In studies are performed carbon dioxide gas, radon and thoron gas measurements. The values acquired in soil gas measurements, which can give important informations providing to deduce aimed at cracks and fracture systems, reservoir formation, underground tectonism implications. Differences of Radon and Thoron gases’ half life, when they evaluate together, enables deducing about level of reservoir formation when they evaluate together. 



Historical findings are unearted as non-damaged is the most important matter on archaeological studies. Reserved areas where the archaeological finds can compose different elements in terms of physical and structural. SONARSEA, acquires approaches historical find related to epoch of subject of the research with firstly the help of literature scanning and opinions of expert archaeologist. Archaeological finds are wanted to identify with obtained approaches or archaeological boundaries are investigated preferring appreciate archeogeophysics method. Most of the time, features of hosting ground of archaeological finds and complexity on archaeological structure involve a multi-disipliner study. So, in the project area is conducted as fit for purpose magnetic survey, electrical resistivity tomography and generally ground penetration radar surveys. Through geophysical surveys 2-D and 3-D views of the first 10 meters below the bottom level, elevation maps and slice sections on the depth at which observed archaeological finds are acquired at high resolution. Accuracy in the horizontal direction are provided with high-precision DGPS, so that the positional accuracy is maintained at the maximum level. Excavation works are carried out without thinking archeogeophysics methods cause unnecessary expense of time-cost element. Therefore, the archeogeophysics methods have become irreplaceable for today's archaeological research.



Microzoning studies, in order to realize regular usage of lands inside of a plan, in a possible earthquake considering all of the geological, geophysical and geotechnical factors; are carried out to establish available regions also in terms of social and economically. The aim of microzoning studies are a basis on regional planning and urban renewal works and contributing disaster management substantially. SONARSEA, conducts geological, geophysical and geotechnical surveys within the scope of microzoning studies. By carrying out studies;

  • Liquefaction Hazard Maps,
  • Dominant period and ground growth distribution maps
  • Soil Classification maps (Eurocode-8, NEHRP, Turkish Earthquake Code)
  • Slope Maps
  • Geological Mapping
  • Shear Wave Velocity Maps Vs30 (0-30)
  • Landslide Hazard Maps are prepared and reported.

As Basis to Zoning plan Geological – Geotechnical Surveys


SONARSEA, provides examination of whether there is a problem as geological in terms of suitability of settlement-structure with geological – geotechnical surveys as basis to the zoning plan and identification of its suitability condition. geological characteristics in the study area, liquefaction and subsidence risks, seismicity, ground water status and parameters obtained geophysical survey are evaluated together is carried out assessment of residential conformity in structuring. SONARSEA, also prepares geological and geotechnical survey reports revealing ground properties of the area to be constructed coastal structure in buildings and plants to be constructed in shore and coastal line and in areas obtained by filling and drying and possible problems originated because of these properties.

SONARSEA to shore and coastline with filling and building to be constructed on land acquired through drying and facilities in the coastal structure of the soil characteristics of the area will be made and revealing potential problems that could arise from these properties, which are proposals for the solution of these problems and application prepares the geotechnical survey reports that guide the project.




SONARSEA, within the scope of topographical mapping survey, acquires latitude, longitude and elevation information depending on stability situation of the project area using total station, levelling instrument and surveyor’s rod and is mapped forming digital elevation model belonging to the project area on requested projection and datum. However, within the scope of monitoring coastal processes beach impact of tides impacts examined in detailed with beach profiling techniques carried



Geothermal energy is one of renewable energy sources has been a important alternative between energy source nowadays. When considering the potential of our country in this regard, existing geothermal production wells is quite a little. In exploration of geothermal area undoubtedly that importance of geological, geophysical and geotechnical survey carried out in tandem is great. SONARSEA, acquires important informations relating to geothermal areas carrying out pre-assessment of the project area geology, geophysical methods (gravity, magnetic and electrical resistivity) and geochemical (gas measurements of carbon dioxide, radon, thoron) surveys and presents its client appreciate drilling locations, depths and approaches relating to reservoir.



Buried fiber optic cables, power cables, discharge pipes, clean water pipes, sewage pipes, gas pipes can be detected using geophysical methods without any excavation work. SONARSEA, obtains detailed informations related to lines performing due to problem ground penetration radar (GPR) in particular, electrical resistivity and seismic survey together on detection of cable and pipeline studies. After all the studies obtained the results are displayed in 2-D and 3-D and sketch-section maps are prepared.



SONARSEA, examines the origin of the groundwater within the scope of hydrogeological studies, its movement on underground, the character of water, the interaction with content and surface waters. Analyzing the groundwater system in detail and investigation of the interaction with surface waters require a series of engineering studies. It is tried to come out underground geology conducting geological and geophysical studies together in the light of literature informations. However, laid down in the hydrogeological model considering also meteorological conditions and the statistical data; is presented in detailed hydrogeological survey reports included groundwater flow direction and flow, determining potential pollution hazards in the aquifer and required precautions.