Blogs

What is a seismograph?

A seismograph is an instrument that measures ground Vibrations irrespective of the source of vibrations. The source could be Rock Blasting, Pile Driving, Traffic or even an Earthquake.

Seismographs used by Civil and Mining Engineers measure the Particle Velocity of the medium on which the sensors are put in 3 directions, i.e. Horizontal, Radial and Vertical (X, Y, Z) and the Air Overhead Pressure (AOP). Air Overhead Pressure is the pressure produced by the displacement of air and is measured in Pascals, or Decibels (Db).

It also measures the frequency of the waveform.

Seismograph Standards

International Society of Explosives Engineers (ISEE) specifications for seismographs are widely accepted as standard in many countries. 

Download ISEE specifications.

Units of Measurement :

Units of measurement are 

Particle Velocity: mm/sec ( Millimeter per Second)

Frequency: Hertz ( Hz), meaning Cycles Per Second

Air Over Pressure: Pascals or Decibels ( dB)

WHICH SEISMOGRAPH TO BUY :

A simple checklist for buying a seismograph is 

1. Is it ISEE-compliant?
2. Does it have a good calibration and repair facility in my area?
3. How is their service?
4. Do they stock enough spares?
5. Can they provide additions that I need, such as 

1. GPS
2. Underwater Measurement
3. Remote Transfer
4. Extra Cable length for sensors
5. Does it serve my special needs such as 

1. Automatic Trigger
2. External Trigger
3. Master Slave Arrangement
4. Configure in Daisywheel arrangement

Download Seismograph Brochure

Contact crm@uttamblastech.com to get commercial details of the seismograph.

Check resources for more information

CALIBRATION 

Calibration is essential to ensure that your seismograph is showing the right readings and working well.

The sensor picks up the electrical signal, which is then converted into a waveform. Hence accuracy of processing is important. Minor damage to settings and/or parts may change the accuracy, though your seismograph may be working well. Working and accuracy are two different things.

All the measuring instruments must be calibrated at least once a year or earlier. ISEE (International Society of Explosives Engineers), ISO (International Standards Organization), Weights and Measurement Act mandates calibration once a year.

Readings from uncalibrated instruments may not be legally sustainable as they are not reliable and may not be accurate.

Contact crm@uttamblastech.com to get commercial details of the above.
Check resources for more information