The Geode is the most versatile seismograph currently on the market for near surface geophysics and exploration. The proven design has stood the test of time to become one of the most widely distributed seismographs in the world; simply because it is ideal for refraction, reflection, MASW, MAM, downhole, VSP or tomography- and even marine surveys. And when you are not using the Geode for exploring, use it for monitoring earthquakes, quarry blasts or vibration from heavy equipment.
A large contributing factor to the success of the Geode is the systems modularity. It is possible to initially buy a simple 24 channel refraction system and keep adding additional hardware and software options as and when they are required, making the system very cost effective.
For light-duty applications, you can run the Geode from your laptop to view, record, and process your data. The software interfaces to the Geode as a simple high-speed network device, eliminating the need for special drivers and cards. For more demanding applications where ruggedness and reliability are key, use the Geode in combination with Geometrics StrataVisor NZXP series seismographs. Geode architecture and Geometrics software lets you build seismic recording systems from 3 to 1000 channels with multiple lines and built-in roll capability.
The low power Geode even have an on-board hardware correlator that can be used for swept sources and MiniSosie (pseudo-random) surveys, compressing data before transmission. The Geode seismic modules house from 3 to 24 channels each and interconnect using inexpensive digital network cable. The Geode will run all day on a small 12v battery and sleeps when not in use. And because getting the answer is key, Geometrics bundles the Geode with a suite of no-charge industry-standard professional software that expands you capabilities for commercial or research applications.
3, 6, 8, 12, 16 or 24. Network multiple Geode Seismographs together to achieve up to 1000 channels.
24 bit result using Crystal Semiconductor sigma-delta converters and Geometrics proprietary over sampling.
144 dB (system), 110 dB (instantaneous, measured) at 2 ms, 24 dB.
0.0005% @ 2 ms, 1.75 to 208 Hz.
1.75 Hz to 20 kHz. 0.6 and DC low frequency option available.
Common Mode Rejection:
> 100dB at <= 100 Hz, 36 dB.
-125 dB at 23.5 Hz, 24 dB, 2 ms.
0.20 uV, RFI at 2 ms, 36 dB, 1.75 to 208 Hz.
Stacking Trigger Accuracy:
1/32 of sample interval.
Maximum Input Signal:
2.8V PP, 0 dB.
20 kOhm, 0.02 uf.
Standard factory configuration is 24 and 36 db, selectable in software. Optionally, can be jumpered for software selectable 12 and 24 dB or can be jumpered in four channel blocks as a single fixed gain of 0 dB for high-voltage devices.
Uses Ethernet transmission standard over CAT 5 copper or multimode fiber-optic cable. Distance between boxes: CAT 5 cable up to 0.25 km; fiber-optic cable up to 1.5 km.
Earthquake, blasting and vibration monitoring. Optional.
SEG-2 standard. SEG-D and SEG-Y available.
Positive, negative or contact closure, software adjustable threshold. Will self-trigger on continuous data using threshold detecting STA/LTA-like algorithm.
Requires 12V external battery. Uses 0.65 W/channel during acquisition, sleep mode reduces power consumption by 70% while in standby.
-30 to 70 degrees C. Waterproof and submersible. Withstands a 1 m drop onto concrete on 6 sides and 8 corners. Passes MIL810E/F vibration.
Laptop running Windows OS or Geometrics’ ruggedized StrataVisor NZ.
Basic operating software controls one Geode and can be optionally expanded to control multiple Geodes, do marine surveying, continuous recording, repeaters, sub-bottom profiling, VSP, GPS synchronization, blast and vibration monitoring and surveillance.
Channel Number: 24-96
Sample Interval: 0.25ms
Record Length: 14-28Hz Vertical Geophones
Receivers: Linear spread with typically 5m receiver interval
Geometry: 14-28Hz Vertical Geophones
Trigger Signal: Contact Closure/Open
Source: Impact, sledge hammer (up to 25m depth of prospection), weight drop >25m prospection
Source Parameters: 4-6 stacks
Channel Number: 24-48
Sample Interval: 0.5ms
Record Length: 0.5-1s
Receivers: 2-4.5Hz Vertical Geophones
Geometry: Linear spread, typically 1-3m receiver interval
Trigger Signal: Contact Closure/Open
Source: Impact, sledge hammer (up to 25m depth of prospection)
Source Parameters: 1-2 stacks
Geode Seismograph is automatically triggering
The trigger sensitivity bar has been set to maximum
If Seismodule controller has continual recording enabled then setting the trigger sensitivity bar to maximum will activate continuous recording. Set the sensitivity bar slightly under maximum. This can be difficult to achieve if the record length and trigger hold off time is very short <0.5s. Press the’1’ button on the keyboard to deactivate data acquisition before changing the trigger sensitivity.
Why are channels 25-48 a mirror of channel 1-24 when using two Geode Seismographs?
The most common cause is of this problem is when the digital interface cable, connecting the the two Geodes to one another, has been incorrectly connected. If the digital interface cable is connected to the input and not output connector on the second Geode then this can result in the second set of channels 25-48 being a mirror of channels 1-24. Check the digital interface cable.
Can be supplied as standard or marsh Geophones.
Typically suited in marine environments where establishing a good electrical ground can be challenging. The Opto Isolator ensures electrical noise does not ingress into the data through the trigger input line.
Surface geophone for triggering the Geode seismograph.
Digital Interface Cable 2m
Short RJ45 cable for easy direct laptop connection.
Pezo electric impact trigger.
Trigger Extension cable
Typically supplied in 100m lengths a trigger extension cable permits the shot location to move long the spread. Multiple extension cables can be connected together to achieve the shot offset required.
Made from Ultra Heigh Molecular Weight PE 1000 this is a durable affordable hammer plate.
Multi Core Spread cables
Choose from slit connectors or Muller clips our seismic spread cables are available with 2m,3m,5, or 10m geophone intervals.
RadExPro is a cost effective but powerful processing suite for Windows PC's which provides effective facilities for processing of high-resolution reflection seismic data, both off-shore and on-shore, with either impulsive or swept (Vibroseis) sources.