Microseismic measurement

1. Measurements of microseismic
vibrations of buildings Scientific
and technical report
Professor of Earthquake Engineering, YTIT DSc: Chikahiro M.
Professor of TTPU DSc: Usmanov S.
PhD Student of TTPU: Karimov B.
Project Engineer of LLC “PRIME TOWER GROUP” : Abduvahidov T.Yu.

2. Tests were carried out in a 12-storey building in the Andijan city. The building is a 12-
storey (12-storey penthouse) monolithic frame building with a basement. The brick
filling of the frame is not involved in the perception of seismic loads
Front and exterior views of the building

3. Sensor parameters
• Acceleration sensors used for building testing
• Three-component accelerometer Netplus Co.LTD Made in Japan
• Transmission: USB1.1 500 KB/s via virtual COM port
• Resolution: 0.005 gal/LSB bit (±２G), 0.25 gal (±8 gal/LSB)
• Power supply voltage: 3.8V ~ 12V (recommended less than 6V)
• Current consumption: 7.5 ～ 8 mA (power supply 5 V, less than 45 mW when the monitor is working)
• Noise: 25 25μG／√Hz (0.14 gal through 30 Hz low pass filter)
• Clock accuracy: less than 1 minute per month
• Memory in the sensor: 1 GB-EEPROM, 22 days of continuous recording at a frequency of 100 Hz, overwriting
• Sampling frequency: 200 Hz, 100 Hz, 50 Hz, 20 Hz, 10 Hz selectable
• Size: 64 mm x 69 mm x 16 mm
• Weight: 45 grams
• PC: Windows 7,8,10 Memory over 2 GB

4. Another sensors Which is used for Measurements
Single sensor for one axis 3D sensor for x,y,z axes Field recording unit for data recording

5. List of building vibration measurement works using a
3-component MEMS accelerometer
Measurement Dates Accelerometer measured positions Fourier Analysis(sampling100Hz) Remarks
1st measure
Accel. Level 0.5
～1Gal p-p
from Dec. 1 2021 to Dec.
2 2021
Central part of building floors:
12th
10th
8th
6th
4th
2nd
Acceleration 746.7sec. FFT analysis
44800 points
Peak Frequency Around 25Hz in both
Horizontal Direction because of vibration
machine
2nd measure
Accel. Level
0.5～1Gal p-p
from Dec. 2 2021 to Dec.
3 2021
Central part of building floors:
12th
10th
8th
6th
4th
2nd
Take zero line by averaging whole
acceleration area. Converting to velocity
using band pass filter 0.5Hz～20Hz. FFT
analysis is conducted
with velocity waves. To get displacement,
it uses 3 times iteration of band pass
filter and two times integral conducted.
Next trace loop are taken.
12 story building has primary natural
frequency about 0.78～0.9Hz in two
horizontal direction.
In up-down component, the building gentle
mountain about 1 Hz. The building has 4
structure parts.
3rd measure
Accel. Level
0.5～1Gal p-p)
from Jan. 31 2022 To
Feb. 2 2022
Central part of building floors:
13th
11th
9th
7th
5th
3rd

7. Time graph of the accelerogram along the three axes x(t), y(t), z(t) date and time
of testing 03.12.2021 11:02.24

8. Temporal history of the building response recorded during the excitation of
the vertical rollers. The figure shows the characteristics of acceleration,
velocity, and displacement on the x-axis. date and time of testing 03.12.2021
11:02.24

9. After scaling and filtering the signal, we will obtain the microseismic response of the
building to the vibration of the Road Vibrator on the x axis, the date and time of testing
03.12.2021 11:02.24

10. We did this type of analysis for 344 blocks for each
sensor at the first and second measurements

11. Comparing theoretical model parameters with real one

12. Linear displacement of axis X(t) using program LIRA

13. Linear displacement of axis Y(t) using program LIRA

14. X Direction Modes Y Direction Modes
1st 1.5Hz 2nd 5.0Hz 1st 1.3Hz 2nd 4.3Hz
C1, C2, C3
C1
C1
C1
C2
C2
C2
C3
C3
C3
C1, C2, C3
C1: Nov. 4, 2021 all day
C2: Nov. 5. 2021 am
C3: Nov. 5, 2021 pm