ジオフィール List of Products and Services

"Electrical logging" is a method that involves lowering electrodes into a borehole to pass an electric current through the geological layers and continuously measure their resistivity. In addition to measuring the resistivity of the geological layers, the naturally occurring electric potential generated electrochemically within the borehole is also measured, which can be used for stratigraphic comparison and permeability assessment through logging diagrams. 【Features】 ■ Utilizing the analog display of the measured resistivity and natural potential, it is possible to determine the thickness, continuity, stratigraphic comparison, detection of aquifers, and identification of impermeable layers. *For more details, please download the PDF or feel free to contact us.

• Site and ground investigation

"PS logging" is a method that utilizes boreholes to measure the P-wave and S-wave velocities of the surrounding ground. Compared to methods like elastic wave exploration, it allows for the acquisition of actual measured values underground. There are two types of methods: the "downhole method," where vibrations are generated at the surface and received inside the borehole, and the "suspension PS logging," where vibrations are both generated and received inside the borehole. 【Features of the Suspension Method】 ■ Vibrations are generated and received inside the borehole ■ Detailed velocity distribution can be obtained ■ The frequency of the received waveforms ranges from 500 to 2000 Hz, which is generally unaffected by normal noise ■ Effective for deeper depths ■ Measurements cannot be taken at depths shallower than the groundwater level *For more details, please download the PDF or feel free to contact us.

• Site and ground investigation

Among the elastic waves that propagate through the ground, waves that travel along free surfaces such as the ground surface are called surface waves. These waves have different propagation paths depending on their wavelength, resulting in variations in frequency and speed according to the S-wave velocity structure of the ground. Our company conducts surface wave surveys to derive the S-wave velocity structure from the way this dispersion occurs. The S-wave velocity structure can be converted to other physical property values (such as N values). Please feel free to contact us if you have any requests. 【Features】 ■ Excellent super vibration efficiency ■ Analysis diagram of two-dimensional cross-section *For more details, please download the PDF or feel free to contact us.

• Geological Survey

"Elastic Wave Tomography" is a exploration method that utilizes the surface, boreholes, and horizontal tunnels by setting up vibration points and receiving points around the target exploration area. When vibrations are generated at the vibration points, seismic waves are observed at many receiving points, and the initial arrival times are recorded. Using the observed initial arrival times, the velocity structure of the ground is analyzed. Compared to surface refraction seismic exploration, it is expected to improve the accuracy of velocity distribution analysis within the target ground. [Features] ■ Directly elucidates the physical properties of the underground ■ Visualizes invisible information using X-ray CT in the medical field *For more details, please download the PDF or feel free to contact us.

• Structural Survey

"Resistivity tomography" is an exploration method that involves installing electrodes around the exploration area using the ground surface and boreholes. It measures the potential generated by the current flowing into the earth to estimate the underground structure (primarily resistivity structure). It is suitable for detailed cavity and resistivity surveys, as well as investigations of fault zones and altered zones, and is expected to improve analysis accuracy compared to 2D resistivity surveys. 【Features】 ■ Non-destructive survey considerate of the Earth ■ High-precision automatic measurement ■ Measurement and analysis possible in a shorter time than before ■ Capable of measuring in areas with vibration noise *For more details, please download the PDF or feel free to contact us.

• Site and ground investigation

Our company conducts cavity investigations using infrared cameras and lasers. Once construction begins, is there a possibility of encountering cavities such as old air raid shelters or mining sites, which could force a halt to the work? We have developed a technology that uses infrared cameras and laser rangefinders to show images of underground cavities and their shapes to construction personnel on-site. This minimizes delays in construction and allows for prompt and appropriate responses, such as filling in cavity areas. [Features] ■ Understanding the shape of cavities through images from infrared cameras and measurements from laser rangefinders ■ 360-degree video recording and laser distance measurement by rotating an aluminum rod ■ Representing the shape of cavities as a floor plan based on measurements from the laser rangefinder ■ Understanding the shape of cavities by varying the depth of laser measurements *For more details, please download the PDF or feel free to contact us.

• Site and ground investigation

Our company conducts surveys using ground-penetrating radar. Ground-penetrating radar is a exploration method that utilizes the property of electromagnetic waves to reflect when they encounter materials with different electrical characteristics while propagating through the air or underground. By emitting electromagnetic waves from the surface or within a borehole into the ground (or within a structure) and analyzing the reflections from the target objects, we can determine the locations of underground cavities, water accumulations, buried pipes such as water and gas lines, rebar within building walls, and geological boundaries. [Examples of Use] ■ Investigation of cavities and looseness ■ Diagnosis of structural deterioration ■ Survey of underground buried pipes *For more details, please download the PDF or feel free to contact us.

• Site and ground investigation

Our company conducts root depth surveys of guardrails and similar structures using NST-2. Using a non-destructive root depth measurement device (NST-2) that employs ultrasound, we can quickly and accurately measure the root depth of steel guardrails and road sign posts. On-site measurements and analyses are carried out by technicians certified by the Japan Society for Elastic Wave Diagnosis, under the direct guidance of these technicians. They are regularly involved in survey operations such as elastic wave exploration, ground-penetrating radar, and electrical exploration, which enhances reliability. 【Main Applications and Fields of Use】 ■ Measurement of root depth for guardrail posts, road sign posts, lighting poles, etc. ■ Damage surveys and length measurements of various pipes, etc. *For more details, please download the PDF or feel free to contact us.

• Site and ground investigation

"Resistivity Survey" is an exploration method that estimates underground structures (mainly resistivity structures) by measuring the potential generated by electric currents flowing through the ground. It allows for detailed surveys to wide-area surveys depending on the electrode spacing (maximum depth of about 300m). Measurements and analyses can be conducted in a shorter time than conventional methods. It can be used for cavity and landslide surveys, as well as groundwater, hot spring surveys, and tunnel and river embankment investigations. 【Features】 ■ Possible to conduct detailed surveys to wide-area surveys depending on electrode spacing (maximum depth of about 300m) ■ Non-destructive survey considerate of the Earth ■ High-precision automatic measurements ■ Measurements and analyses can be conducted in a shorter time than conventional methods ■ Capable of measuring in areas with vibration noise *For more details, please refer to the PDF materials or feel free to contact us.

• Geological Survey
• Environmental Survey
• Non-destructive testing

"High-Precision Elastic Wave Exploration" is an analysis using tomographic methods. Data is acquired using digital multi-channel systems. Compared to conventional refraction method elastic wave exploration, the velocity structure of the ground can be analyzed in greater detail. Utilizing seismic and reception data within the borehole increases precision. 【Features】 ■ Analysis using tomographic methods ■ Data acquisition through digital multi-channel systems ■ Higher precision achieved by utilizing seismic and reception data within the borehole ■ Ground velocity structure can be analyzed in greater detail compared to conventional refraction method elastic wave exploration *For more details, please refer to the PDF document or feel free to contact us.

• Geological Survey
• Environmental Survey

Our company conducts the Waseda-style dynamic seismic performance diagnosis, which evaluates the seismic resistance of buildings by applying vibrations and analyzing their vibration characteristics. By observing the continuous micro-vibrations of the ground and the building, we measure the building's natural period, resonance coefficient, and vibration amplification factor, and calculate and analyze the seismic performance evaluation index. 【Features】 ■ Developed a method for dynamically evaluating seismic resistance (Patent No. 3857680) ■ Measurement method is simple ■ No special construction is required for the installation of vibration meters *For more details, please download the PDF or contact us.

• Structural Survey