Seismic monitoring for dams, Russia

Güralp Instruments monitoring seismic activity in the threatening dams in the Caucasus Mountains, Russia

The Sulak river in Dagestan, SW Russia, generates 1780 MW of power via a cascade of hydroelectric dams. The whole river lies within the seismically active Iran-Caucasus-Anatolia region which has experienced multiple M0 6.0+ earthquakes in recent history and has the potential for a M0 7.0+ in the near future. An array of 13 Güralp 6TD digital broadband seismometers transmitting real-time data for analysis provides an automatic remote sensing system, with Güralp instruments chosen for their ability to overcome field and network restrictions whilst simultaneously providing excellent quality data.

Background

Hydroelectric dams often require strong motion accelerometers to measure their vibrational response to nearby earthquakes. There are seven dams on the Sulak cascade, operated by Public Joint Stock Company RusHydro, that require broadband instrumentation to monitor seismic activity that has been advancing from the eastern Mediterranean over the last 200 years. Portable, simple installation instruments for sites with moderate background noise were required, due to the absence of suitable vault locations, to monitor the effect of earthquakes in the near-field without being affected by the dams themselves. M0 6.0+ events have the potential to cause major structural damage to the dams as well as severe flooding downstream. Poor infrastructure required a system capable of supplying data to the RusHydro Dagestan HQ in Kaspiysk and the Dagestan Geophysical Survey in Mahachkala despite frequent power and communication interruptions.
Image

Chirkeisk Dam, Dagestan Republic, Russia. Although strong-motion sensors are already deployed on the dam, this project required an array of broadband seismometers to detect and characterise regional

Güralp Solution

An array of 13 Güralp 6TD digital broadband seismometers was deployed across the region to monitor the increasing activity and potentially identify precursors to earthquakes that could cause major structural damage to the dams on the river. The 6TD was the perfect choice for RusHydro due to its portability, enabling it to be transported to remote locations and also its ability to record data to internal memory when the transmission network is interrupted. The GCF format (Güralp Compressed Format) was also the ideal way to transmit data thanks to its compact file size compared with other widely used formats e.g. miniSEED. The combination of standby memory, compact format and use of TCP protocol to avoid mixing, overlapping or loss of data packets means the Güralp solution provided an effective way of monitoring the seismic activity.
Image

Seismic Monitoring Array Array of 13 Güralp 6TD digital broadband seismometers spanning the length of the Sulak river (A). Dashed arrow (B) shows observed migration of seismic activity across the Iran-Caucasus-Anatolia region over the past 200 years.

Image

Robust 6TD Seismometer

Address:
Güralp Systems Ltd.
3 Midas House, Calleva Park
Aldermaston, Reading
RG7 8EA
United Kingdom

Tel: 01189 819056
Email: sales@guralp.com
Copyright © 2019 Güralp Systems Ltd. All Rights Reserved.
This website uses cookies. You may decline the use of cookies for this website but it may impact your user experience. Click on the 'More information' button to find out more about the cookies we use.
More information Accept cookies Decline cookies