Acapulco/Mexiko earthquake measured by KSS32-M Gravitymeter stationed in Germany.

The heavy earthquake that took place in Mexico at 2021-09-08 01:47:47 (UTC) (https://earthquake.usgs.gov/earthquakes/eventpage/us7000f93v/executive) could also be measured by a KSS32 Marine Gravitymeter stationed in the BGGS facility in Meersburg, 10.000 kilometers away:

The measurement of the sensor GSS32 that is used in the KSS system is based on the unit mgal. The plot above shows how the unfiltered raw data clearly shows the earthquake’s characteristic shocks.

As a reference: the following chart has been measured by a seismological station in Schiltach/Southern Germany (source: Black Forest Observatory Data. GFZ Data Services, https://doi.org/10.5880/BFO)

At BGGS, several Gravitymeters are continuously measuring. If you are interested in details, please do not hesitate to contact us.

Update KSS31 to KSS32M!

BGGS Gravitymeters are known for their precision, reliability and durability. The latter is especially true for the sensor itself: like a good bootle of wine, this highly sophisticated electro-mechanical device gets better and better over time, this is because of the disappearance of tensions in the mechanical parts.

Therefore it is not unusual to see KSS31 Gravitymeter systems with up to 30 years in service, (still) measuring perfectly. Nevertheless, there is usually a need for state of the art electronics (e.g. battery free power backup) and data interfaces. BGGS for this reason offers upgrades to existing KSS31 systems, replacing all external electronics (no more external rack) with ulta-compact integrated electronics and PC-based, generic data interfaces as well as an easy to use but flexible software for control and data acquisition.

This upgrade included checking, servicing and updating the GSS31 sensor to GSS32 (24bit A/D converter, temperature monitoring, etc.), ready for some further decades of service on board.

Interested? Please get in touch with us for further information and your personal quotation.

Measured: earthquake in South Pacific Ocean

On 8th of December 2016 an earthqauke occurred at the Solomon Islands in the South Pacific Ocean (→ read more here).

15.000 kilometers away, in Meersburg/Germany at the BGGS facility, Gravity Sensor type GSS30 with S/N23, currently being there for service, was able to measure the shock in terms of ±0.6mGals.

Gravity measurement results are shown unfiltered (GR) and filtered (GF) with 4th order low-pass Bessel filter with a time constant of 174s.

KSS32 for marine application


With its Gravitymeter System KSS32M, BGGS offers a state-of-the-art, gyro-stabilzed platform combined with the proven, updated BGGS sensor GSS32 (spring and mass system with magnetic compensation).

Compared to the predecessor KSS31M, the new platform integrates all electronics (ZE), power supply (PS) and interfaces which results in a very compact sea gravimeter.

All user interaction, data visualization and more is done via the DACQS2 application software.

For more information, check out the KSS32M product flyer or contact us.