Terraloc MK8 Seismometer
Wide range of sampling rates, from 25 μs to 2 ms. Fast enough for crosshole surveys * Record lengths ranging from 3.2 ms to 32.7 seconds. Long enough for Moho studies
  1. Features
  2. Specification

Powerful yet portable – all you need in one case

Terraloc is a compact, and complete seismograph with all you need to collect your seismic data in a single casing. Just add geophones, cable and power.

To allow for your most stringent environmental demands Terraloc is housed in a rugged die-cast Aluminum casing to ensure highest performance and reliability wherever you go. Rain, heat, dust, sleet or snow? Not to worry - Your Terraloc can be operated anywhere, anytime.

To further protect the instrument there are as few openings as ever possible. Instead of incorporating a power thirsty and sensitive hardcopy printer in the design, which would have induced another hole in the casing, the built-in PC with its associated daylight visible screen let you inspect your data as you go.

All this, without exposing the interior of the instrument to environmental hazards through printer or breathing openings. Store the data on the built-in hard disk for later printing or data transfer. However, should you need a hardcopy of your record in the field, just connect a standard battery operated printer, whenever you need.

Key Features

Key features of Terraloc are not only reliability and field worthiness but also to offer you a powerful seismograph that has advantages as:

Wide range of sampling rates, from 25 μs to 2 ms. Fast enough for crosshole surveys

Record lengths ranging from 3.2 ms to 32.7 seconds. Long enough for Moho studies

On-site geophone and cable testing. Enhances in the field QC

Real time noise monitoring. Measure at optimum conditions

Wide choice of multi- or single- trace view modes. Fast and detailed analysis

Frequency spectrum analysis. Allows you to check where your filters should be set.

Refractor velocity indication. Quick check of target velocities found and much more. Check the spec’s on the last page for more details

Field operations may not allow you to post-process your data in the office. The onboard powerful PC running Windows XP will let you run interpretation software onsite.

Let us know what you plan to do and we can suggest a software that will help you reach your goal. ABEM has agreements with several well renowned suppliers of software for interpretation of geophysical data.

Number of channels (smaller unit)                     : 4-24 in steps of 4

Number of channels (larger unit)                        : 4-48 in steps of 4

Additional channels                                            : Easily obtained by linking two or more units together

Up-hole channel                                                  : Yes

Sampling rate (selectable)                                  : 25, 50, 100, 200, 500, 1000 & 2000 μs

Record length (selectable)                                 : 128, 256, 512, 1024, 2048, 4096, 8192 or 16384 samples per trace equivalent to: 3,2 ms – 32,7 s

Pre-trig record (selectable)                               : 0 – 100 % of record length

Pre-stack correlation                                         : Yes, cross correlation with reference or any other channel

Delay time Related to sampling rate                    : May be set (for example) from:

                                                                                               + 0 – 0,8 s at 25 μs sampling rate

                                                                                               + 0 –131 s at 2ms sampling rate

Stacking                                                              : 32 bits, up to 999 impacts

Unstack                                                               : Remove last shot from stack

Trigger inputs                                                      : Trigger coil, make/brake, geophone, TTL

A/D converter resolution                                      : 21 bits

Dynamic range (theoretical / measured)            : 126 / 114 dB

Max input signal                                                 : 500 mV p-p

Frequency range                                                : 1-4000 Hz (at 25 μs sampling rate)

Total harmonic distortion                                     : - 80 dB

Crosstalk                                                            : - 86 dB

Input impedance                                                  : 3 kΩ

Noise monitor                                                      : Amplitude

Analog filters                                                      : Low cut (selectable): 12 or 24 dB / octave, 16 steps from 12 to 240 Hz

Notch                                                                  : 50 or 60 Hz specify when ordering

Anti-aliasing                                                       : set automatically based on sampling rate

 

 

 

Post recording features

Digital filters                                                            : Band-pass, low-pass, high-pass, band-reject & remove DC offset

Spectrum analysis                                                 : Any single trace, FFT analysis

Velocity Analysis                                                    : On-screen analysis of refractor velocity

First-arrivals picking                                               : Automatic or manual, Times can be saved with record

Correlation                                                               : cross correlation

 

 

 

Processor, RAM and hard disk

Processor                                                                 : Low power AMD LX800, 500 MHz

Operative System                                                   : Windows XP

Internal RAM                                                           : 1GB (DDR SO-DIMM module)

Hard disk capacity                                                  : at least 60 GB (2,5 “ EIDE drive)

Memory card reader                                               : SD, Compact flash , MMC, Memory stick, Smart media etc.

Display                                                                     : 8,4 “ Active TFT LCD, full colour, daylight visible

External display port                                              : VGA output

I / O port                                                                    : 3 USB 2.0 ports

Network interface                                                   : Ethernet 10 / 100 Mbps, RJ-45 IP 67

Power                                                                       : 10 – 30 V DC external battery

Power consumption                                              : 36 W (24 ch) or 60 W (48 ch)

Ambient temp (operating 24 ch)                          : 0 to + 50 oC

Ambient temp (operating 48 ch)                          : 0 to + 45 oC

Ambient temp (storage)                                         : - 40 to + 80 oC

Casing                                                                      : Rugged cast aluminium, meets IEC IP 66

Weight, 24 channels                                             : 16 kg

Weight, 48 channels                                             : 23 kg

Dimensions, 24 ch unit                                         : 480x260x330 mm

Dimensions, 48 ch unit                                         : 480x260x470 mm