Short-period Seismometer

Model S-13/GS-13

629 V/(m/sec) sensitivity / 2000 V/(m/sec)
Mass lock
Period adjust
Simplified field maintenance
Excellent stability over long periods of time
More than 4500 units in operation

The Geotech Model S-13 is a high resolution, premium seismometer capable of meeting the noise and stability requirements of the most demanding seismic studies. It features adjustable natural frequency from 0.75 to 1.1 Hz (typical 1.0 Hz). The S-13 external mass lock, spring tension and operational adjustments are all fitted with seals that enable the instrument to be submerged to 100 feet without leakage. A major attribute of the S-13 is a mechanical design that lends itself to field repairs by unskilled persons using minimal spares. This quality, plus 30 years of outstanding performance in the field, qualify the S-13 to be the short-period seismometer standard by which others are compared.
For a web-based model on the theory of operation check this link:
http://www.ifg.tu-clausthal.de/java/seis/sdem_app-e.html

TECHNICAL SPECIFICATIONS

OPERATING CHARACTERISTICS

Mode of Operation
Natural frequency
Tilt
Inertial mass
Temperature Range
Transducer
Type
Damping
Generator constant
Coil resistance
Maximum Mass Travel
Calibration Coil Resistance

Dynamic range

- Convertible - vertical and horizontal
- 0.75-1.1 Hz, typical 1 Hz
- Operates within 4º of vertical at 0.8 Hz
- 5.0 kg (11.0 lbs.)
- -51 to +60 ºC (-60 to +140 ºF)

- Moving coil (velocity)
- Electromagnetic
- 629 V/(m/sec) / 2000 V/(m/sec)
- 3600 Ohms / 9100 Ohms (consult factory for other values)
- ±3.0 mm (0.12 in.)
- 23 Ohms, maximum current 100 mA, calibration coil well separated from the signal coil
- 164 dB @ 1 Hz and 184 dB @ 100 Hz

PHYSICAL CHARACTERISTICS

Dimensions
Height
Diameter
Net Weight
Shipping Data
Weight
Volume

- 38.1 cm (15 in.) over handle
- 16.8 cm (6.63 in.)
- 10.4 kg (23 lbs.)

- 13.6 kg (30 lbs.)
- 0.036 m³ (1.3 ft³.)