ASTM D4428 Borehole 3D Geophone Downhole 3c Geophone Crosshole Geophones for Gea 24 Seismograph Seismic Downhole Sensor

• Customization: Available
• Frequency: 4 Hz to 100 Hz Optional
• Working Mini Diameter (mm): 50
• Model NO.: GDZ
• Working Temperature: 25~55
• Diameter(mm): 45
• Height (mm): 210
• Cable Length: Optional
• Probe Interval Cable Length: Optional
• Weight (Kg): 22kg~60kg
• Accuracy: 1mm
• Vertical Lines: 3
• Horizontal Line: 3
• After-sales Service: Yes
• Warranty: 1 Year
• Transport Package: Cartonbox
• Specification: CE/ISO/FCC
• Trademark: GOLD
• Origin: Chongqing
• HS Code: 9002209000
• Production Capacity: 100 PC Per Month

Product Description

ASTM D4428 Borehole 3D Geophone  Downhole 3C Geophone Crosshole Geophones for GEA 24 Seismograph Seismic Downhole Sensor

What is Seismic Downhole Works?
Seismic Downhole is a method from applied geophysics that uses the principle of seismic waves propagation in rock bodies/internal layers of the earth. On the ground surface, Seismic waves are generated usually with a sledge hammer hitting a beam deployed at the ground surface.
Seismic waves consisting of P wave and S waves that propagate and are then recorded by geophones that have been placed in the borehole. Downhole seismic method measures the time taken for seismic waves (P wave and S waves) to move between a seismic source located on the surface of the ground, and the receivers, placed inside a borehole. 
Downhole seismic method measures the time taken for seismic waves (P wave and S waves) to move between a seismic source located on the surface of the ground, and the receivers, placed inside a borehole.

Main objective Downhole Seismic is used to obtain elastic modulus information from the subsurface medium through the seismic wave velocity, P wave velocity (Vp) and S Wave velocity (Vs) in the subsurface medium.
Based on the Vp and Vs data obtained from the Seismic Down Hole test and density from bore hole coring, it can be estimated the near-surface soil geotechnical properties.

The 3D borehole geophone used in seismic downhole survey work is GDJ-DJ borehole geophone, borehole geophone is realized with 3x high sensitive geophones wide natural frequency (4hz-100Hz optional , 1 vertical and 2 horizontal sensors, oriented according to a triad of orthogonal Cartesian axes (XYZ).

Model	GDJ-DJ Borehole 3D Geophone	GDJ-JG Borehole 3D Geophone	GDJ-JF Borehole 3D Geophone
	Electromagnetic borehole geophone series	Piston type borehole geohphone series	Non-adjacent borehole geohphone series
Frequency (Hz)	4HZ-100HZ optional	4HZ-100HZ optional	4HZ-100HZ optional
Working Mini Diameter (mm)	Φ70-φ120	Φ50-φ110
Working Temperature	25~55	25~55	25~55
Diameter(mm)	φ55	φ50	φ45
Height (mm)	465	500	300
Weight (kg)	60m-10kg, 120m-14kg	60m-12kg,120m-17kg	60m-60kg,120m-10kg

Borehole 3D geophones have a wide range of applications in geophysics and geotechnical engineering. Here are some examples:

Mineral exploration: Borehole 3D geophones can be used to detect the presence of mineral deposits by measuring the seismic response of the subsurface to an artificially generated seismic wave. This technique can be used to identify the location, depth, and extent of mineral deposits.
Hydrocarbon exploration: Borehole 3D geophones can be used to map the subsurface geology and identify potential hydrocarbon reservoirs. This information can be used to guide the drilling of exploration wells and to optimize production from existing wells.
Geotechnical engineering: Borehole 3D geophones can be used to investigate the subsurface structure and soil properties at a construction site. This information can be used to design foundations, excavations, and other geotechnical structures.
Earthquake monitoring: Borehole 3D geophones can be used to monitor seismic activity and detect the propagation of seismic waves through the subsurface. This information can be used to improve earthquake hazard assessments and to develop early warning systems.
Environmental studies: Borehole 3D geophones can be used to investigate the subsurface structure
Load failed to identify potential environmental hazards, such as groundwater contamination, and to monitor the effects of environmental remediation efforts.

Mining and tunneling: Borehole 3D geophones can be used to investigate the subsurface structure ahead of mining or tunneling operations, in order to identify potential hazards such as fault zones, weak rock or water-bearing strata.
Civil engineering: Borehole 3D geophones can be used to investigate the subsurface geology to optimize the design of civil engineering structures such as tunnels, bridges, dams and retaining walls.