Seismic instruments: article

P.G. Butyrin1
P.G. Verkholantsev2
A.V. Verkholantsev1
D.Y. Shulakov1
1 Mining Institute of the Ural Branch of the Russian Academy of Sciences
2 Federal Research Center Geophysical Survey of the Russian Academy of Sciences
Journal: Seismic instruments
Tome: 54
Number: 2
Year: 2018
Pages: 5-23
UDK: 550.8.08
DOI: 10.21455/si2018.2-1
Keywords: seismic monitoring, seismic logger, data acquisition system, time synchronization, autonomous seismic station, broadband geophone, analog to digital converter, GPS receiver
Аnnotation: The necessary conditions for development and successful implementation of digital seismic logger “Ermak-5” is considered. Short review of similar technical solution for modern seismological monitoring systems is given and qualitative comparative analysis is fulfilled. Technical and operational demands for development of logger are substantiated. The results of Laboratory and field experiments were carried out for confirmation of key technical characteristics of the device. Wherein the special attention is paid to conformity of amplitude-frequency characteristics of the logger to reference analogues. Different types of seismometers used for comparative testing. Description of hardware-software implementation of the flexible power management system of the logger is given. It helps decrease power consumption to near 300 mW when the registration is made through six channels. The logger can be used for longtime registration with autonomous sources of power. The core of time in the logger is developed by using special algorithms, which allow technological maximum for inner clock synchronization accuracy by using the GPS/GLONNAS systems (hundreds of nanoseconds) and NTP-services (dozens of microseconds). Details of time synchronization algorithms are examined and description of experimental laboratory and filed setup for time synchronization accuracy is given. The LCD-screen of the logger is very important for effective exploitation. Information about time, some logger’s parameters and waveform in different modes are appeared at the display. The experience of implementation at the different seismic monitoring objects is generalized, and it accounted for the revision process of the logger project.