Welcome To Seismic Source Company

Seismic Source Company is a manufacturer of seismic instruments and data acquisition systems. Its products are used in a broad range of applications: Seismology, Structural Monitoring, Seismic Site Evaluation, Civil Engineering, Gas and Oil Exploration, Industrial Vibration Monitoring.


distributed daqlink4
Networked Seismic Recording System

Inexpensive, Flexible, and Expandable

The Distributed DAQlink 4 System is the combination of a standard DAQlink 4 seismograph and internal, high-speed, network extenders. Using inexpensive twisted pair telephone cable, these network extenders will send triggering times and receive seismic data from other DAQlinks. These cable links can send reach 10,000 ft, or three kilometers in length.

The entire system is connected to a computer which controls the seismograph network and stores the acquired seismic data. This computer can be simultaneously providing Quality Control as the project is acquired. The final data files can be stored in SEG‑2, SEG‑D, SEG-Y, ASCII or MiniSEED format.


System Features:


Cutting-Edge Performance

1 to 24 channels per seismograph node

High-Speed 24bit ADC – up to 64,000 sps

Wide Bandwidth – DC to 32 KHz (unfiltered)

Low Distortion – 0.00006% THD @ 500 sps

Wide Dynamic Range – > 144 dB (system) and >124 dB (measured) @ 500 sps

Low Noise – less 0.15 µV RMS @ 500 sps


Multiple Time Synchronization Modes

GPS Clock Discipline for Autonomous Recording

VHF/UHF Radio for Underground Use

Or synchronize multiple DAQlink via cable


Multiple Trigger Modes

Trigger on hammer switch for shot acquisition

Trigger using GPS time for noise monitoring

Two trigger circuits available, one for standard and a second for low-voltage inputs


Multiple Data Storage Methods

16 Gbytes internal memory card standard
External mounted, USB-compatible Memory Plug for data backup and transfer
Ethernet connection for fast data transfers and remote data storage

Built-in Ethernet Network

Use network to configure seismograph and monitor acquisition
Compatible with cables, Wi-Fi and Cellular Data
Internal FTP server for external data access

Built-in Acceptance Testing

Instrument Tests:
  Distortion, Cross-feed, CMRR, Impulse & Noise
Sensor Tests:
  Resistance, Frequency, Damping, Sensitivity


Distributed DAQlink4

daq4 24d


24 Channel Seismograph



Operation Modes:


Operate as Stand-Alone Seismograph

Use a sledgehammer and hammer switch

Small, lightweight unit for small, fast crews


Operate as an Acquisition System

Use a vibrator and Force 3 controller

Network a computer to Monitor Acquisition,
Quality Control Data, and Store Shot Records


Passive Monitoring

True Continuous Recording

Use Cellular Modem for Remote Data Collection

Works with surface or downhole sensors


Automated Event Detection

Continuously record and store data
Use LTA (Long Term Average) or STA (Short Term Average) to detect events
Includes automatic email notifications as events are located


distributed daqlink4

The entire system controlled from a central location

distributed daqlink4

24 Channels per Node


Distributed DAQlink 4 with Built-In Network Extender Features:

High-speed time break, system status and data transfer

Uses inexpensive twisted pair telephone cable

Simple setup and configuration

Allows seismograph spacing of 10,000 ft, 1.9 miles or 3 kilometers


distributed daqlink4

Standard DAQlink 4 Seismograph
with standard top-mounted connectors





distributed daqlink4

Vibrators or Impulse Sources



Other DAQlink 4 Connection Options:


Besides the Network Extender option, seismograph networks can be constructed using the 100Base-T network

Cable Solution - 100 meters maximum between network switches

WiFi solution - typical line of sight or 1 Km with 900 MHz units (distance depends on environment)

Cellular Data Modem Solution – Connect each DAQlink4, or the entire DAQlink 4 system, to a cellular data modem and download data from anywhere via the Internet

  dist daq4 5

2D or 3D Acquisition



Distributed DAQlink 4 Trigger Options:

Cabled solution - wired trigger signal is connected to each DAQlink unit

VHF Radio solution - Wireless Trigger box is connected to each unit - Trigger signal is sent via VHF radio

GPS solution - if all DAQlinks units have GPS synchronization, then the triggering will be synchronized via the GPS time. Only one DAQlink needs to be wired to the trigger signal. The other DAQlinks will start at correct GPS time via Ethernet commands from the Vscope software.

Trigger Storage - with the DAQlinks continuously recording with GPS synchronization, store the GPS trigger times at the Source Points and Post process Shot Records.


distributed daqlink4


Downhole Recording



MegaDAQ - Multiple DAQlink 4 Seismographs
in a single chassis



dist daq4 stack

  240 channel system
  MegaDAQ (DAQlink 4S Seismograph)

All connectors have been relocated to the side of the case, enabling DAQlinks to be stacked.

With the connectors centralized, cable runs are shorter and easier to maintain.

With the seismograph modules in a central location, they can be networked for real-time data.

MegaDAQ configurations utilize a single GPS module for consistent timing.

The MegaDAQ configuration packs the largest number of channels into the minimum amount of space.

Includes VibraScope 3 Software:

dist daq4

Configures DAQlink 4 for Acquisition
Monitors Seismograph Operation
Offloads and Evaluates Data
Data Display
Analysis – Amplitude & Phase Spectra
RMS Noise and Signal Graphs
For larger systems, DAQlink 4 seismographs are compatible with the full line of iSeis Sigma Field Software, including Source Link & Sigma Observer.

Distributed DAQlink4 Specifications:



24 bit sigma delta converter


Anti-Alias Filters


85% of Nyquist frequency


Low Cut Filter


User Selectable from 0.001 Hz to 120 Hz


Filter Type


Linear or Minimum Phase


Sample Rates


125 to 64,000 sps


User Selectable PreAmp Gain


x1 (0 dB), x4 (12 dB) & x16 (24 dB)


Max Input Voltage


6 Volts @ x1 gain & peak-to-peak




DC to 32 kHz (unfiltered)


Power Usage


Typically 0.13 watts per channel


Input Impedance


100k Ohms


Clock Sync


GPS Disciplined or VHF Radio Link


Power Supply


9-28 VDC


Trigger Delays


Pre-Trigger 30 / Post-Trigger 100 secs


Number of Channels






-40°C to +85°C




0 to 100%




11.0" x 9.7" x 2.2" (280 x 246 x 56 mm)




4.4 lbs (2.0 kg)


Data Storage (Internal 16GB CF)


120 hours continuous (24 channels @ 500 sps)


Data Storage (on Computer)


Unlimited - Depends on computer


Data Storage (External)


Unlimited - USB Compatible, & Can be changed during acquisition


Data Format


SEG-2 (*.sg2), SEG-D (*.sgd), SEG-Y (*.sgy), ASCII (*.csv) & MiniSEED




Network, Status, Battery

Performance @ 500sps:

Trigger Accuracy




Dynamic Range


>144dB (system) / >124dB (measured)




0.00006 %




Better than -125 dB


Common Mode Rejection Ratio


Better than 100 dB


Noise Floor


<0.15 μV RMS @ 500sps & x16 gain


Computer Network


10-pin Weatherproof




6-pin Weatherproof




3-pin Weatherproof




2-pin Weatherproof


Auxiliary Data


14-pin Weatherproof


USB Memory


19-pin Weatherproof


Seismic Data


55-pin Weatherproof


Network Backbone


10-pin Weatherproof (2 ports)


  Distributed DAQLink4 Brochure Download Distributed DAQLink4 Brochure

Seismic Source Co

2391 E. Coleman Rd.
Ponca City, OK 74604
Phone: (580) 762-8233
Fax: (580) 762-1785
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