A Short-Period Vertical Seismometer and Auxiliary Equipment for Installation in Boreholes

IF 0.3 Q4 GEOCHEMISTRY & GEOPHYSICS

Seismic Instruments Pub Date : 2022-09-30 DOI:10.3103/S0747923922050048

I. P. Bashilov, O. A. Gerasimchuk, V. I. Sleptsov, A. Y. Eltekov

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Abstract

A new short-period borehole seismometer TBSC6 designed and produced at the Dukhov All-Russian Scientific Research Institute on Automatics provides proportional transformation of vertical seismic velocity oscillation to electrical signal. The seismometer has been designed for installation in boreholes with an inner diamter of 145–220 mm and inclination up to 3.5°. In its technical features (frequency range 0.5–100 Hz, linearity less than 0.006%, noise level less then –10 dB of the low seismic noise model, dynamic range greater than 145 dB, temperature range –25 to 50°C), the seismometer corresponds with the best short-period borehole seismometers in the world. The features achieved make it possible to use the short-period borehole seismometer for seismological observations of both far and local seismic sources and also for seismic situation monitoring in the vicinity of hydrotechnical structures, nuclear power plants, etc.. Auxiliary equipment (locking device, installation complex set with the borehole ahead) provides seismometer installation in boreholes with an inner diameter 145–220 mm at depth down to 100 m. Borehole ahead saves borehole tube with an outer diameter of 150–250 mm.

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井内安装的短周期垂直地震仪及辅助设备

由Dukhov全俄自动化科学研究所设计和生产的新型短周期井眼地震仪TBSC6提供了垂直地震速度振荡与电信号的比例转换。该地震仪设计安装在内径145-220毫米、倾角3.5°的井眼中。该地震仪的技术特点(频率范围0.5 ~ 100hz，线性度小于0.006%，低地震噪声模型噪声级小于- 10db，动态范围大于145 dB，温度范围-25 ~ 50℃)与世界上最好的短周期钻孔地震仪相对应。这些特点使得短周期钻孔地震仪可以用于远地和本地震源的地震观测，也可以用于水工设施、核电站等附近的地震情况监测。辅助设备(锁紧装置、井眼前方设置的安装综合体)可在内径145-220毫米、深度100米的井眼中安装地震仪。超前钻孔可节省外径150 - 250mm的钻孔管。

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来源期刊

Seismic Instruments GEOCHEMISTRY & GEOPHYSICS-

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44.40%

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期刊介绍： Seismic Instruments is a journal devoted to the description of geophysical instruments used in seismic research. In addition to covering the actual instruments for registering seismic waves, substantial room is devoted to solving instrumental-methodological problems of geophysical monitoring, applying various methods that are used to search for earthquake precursors, to studying earthquake nucleation processes and to monitoring natural and technogenous processes. The description of the construction, working elements, and technical characteristics of the instruments, as well as some results of implementation of the instruments and interpretation of the results are given. Attention is paid to seismic monitoring data and earthquake catalog quality Analysis.