Campus Vibration in Nanwangshan Campus, China University of Geosciences at Wuhan Monitored by Short-Period Seismometers
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ISSN 1674-487X
Campus Vibration in Nanwangshan Campus, China University of Geosciences at Wuhan Monitored by Short-Period Seismometers Lihui Wu
1, 2
, Dun Wang *3, Ziguang Lei3, Jing Fu3, Shuai Min3, Xianbing Xu3, Sarina Bao4
1. School of Management, Hubei University of Education, Wuhan 430205, China 2. Institute of Supply Chain Operation and Service Innovation, Hubei University of Education, Wuhan 430205, China 3. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China 4. Department of Environmental Science and Policy, University of California, CA 95616, USA Lihui Wu: https://orcid.org/0000-0002-5624-8836; Dun Wang: https://orcid.org/0000-0001-6435-9168 ABSTRACT: Continuous seismic observations can record seismic waveforms, and ambient noise, for the purposes of earthquake researches and other applications. Here we deploy three digital seismometers (EPS2) in and around the Nanwangshan Campus of the China University of Geosciences (Wuhan). This network was running from April 9 to May 9 of 2018. During this period, the seismometers recorded the May 4, 2018 M6.9 Hawaii earthquake. From the recorded waveforms, we could observe clearly the P and S arrivals, and the corresponding particle motions. Analysis of continuous observations of ambient noise shows obvious fluctuation of vibration intensity inside of the campus. The campus is quietest from 0 to 5 am. From 5 am on, the vibration intensity increases, and reaches the peak of entire day at 12 am. The amplitude then decreases to a very low level at 19:30 to 20:00 pm, and reaches another strong noisy time at 21:00 to 21:30 pm. After 21:30 pm, the intensity goes down slowly. We also observed seismic signals that were generated by the interaction of speed-control hump cars and ground. By taking the envelope and smooth operations, we observe different characteristics for different car speeds, which suggests that seismic monitoring approaches can be used for speed measurement of cars. This kind of small seismic network running in a real time fashion, would greatly help understanding of the sources of ambient noise at high frequency bands in interested areas. Analysis of a long-term observed dataset, and real time illustration will help to strengthen campus security and high-precision laboratory deployments, and also contribute to research atmosphere in earthquake science. KEY WORDS: ambient noise, vibration intensity, seismic waves, seismometers, human activity. 0
INTRODUCTION Ambient noise observation is important in pure and applied geophysics, as it offers better understanding of earth structures, detailed geodynamic environments, and environment changes (e.g., ice quakes) as well. Continuous ambient noise studies in seismology have greatly advanced our understanding of detailed structure in tectonically active areas. Studies concerning velocity changes before and after large earthquakes (e.g., the 2011 M9 Tohoku, Japan earthquake) using ambient noise show clear evidence for th
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