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Detection of Earth's free oscillation excited by the Japan Mw9.0 Earthquake using different tiltmeter and strainmeter

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Geodesy and Geodynamics 2018年第5期9卷 398-403页

作者： Yan Zhang Fangjie Meng Key Laboratory of Earthquake Geodesy Institute of Seismology China Earthquake Administration Wuhan Base of Institute of Crustal Dynamics China Earthquake Administration

The observatory network of the Crustal Deformation China Seismological Bureau was equipped with vertical pendulum tiltmeter,borehole tiltmeter,tunnel extension meters,multi-component borehole strainmeter,body strainmeter and other tilt and strain observation *** of these instruments have recorded the Earth’s free oscillation excited by the Japan Mw9.0 *** analyzing those observations,all of the spheroidal oscillation modes(0S3-0S30)and toroidal oscillation modes(0T3-0T20)excited by the Japan Mw9.0 Earthquake were detected in this *** addition,comparing the different observation results which obtained by those instruments,we revealed their capacity to observe different kinds of oscillation and different frequency band modes,and analyzed report the *** found that the body strainmeter and the vertical pendulum tiltmeter have better observing results for spheroidal *** of high noise in low frequency band,the borehole tiltmeter cannot observe the low-order spheroidal *** terms of observing the toroidal oscillation,the multi-component borehole strainmeter got a best *** vertical pendulum tiltmeter observes a few toroidal oscillation modes,and the tunnel extension meters can only observe some low-order modes.

关键词： Tiltmeter strainmeter Free oscillation of the Earth Tohoku earthquake

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A Review of the Calculation Formula for the Four-component Borehole strainmeter and Application to Earthquake Cases

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Earthquake Research in China 2019年第1期33卷 132-146页

作者： SU Kaizhi Institute of Crustal Dynamics China Earthquake Administration

Based on the principle formula for the four-component strainmeters, we can directly obtain the specific plane strain, shear strain and azimuthal angle of the principal strain, and the maximum and minimum principal strains calculated afterwards are the indirect result. The problems of practicality of the sensitivity coefficients A and B of plane strain and shear strain are then discussed. Based on this idea, we analyzed the observation data of several four-component borehole strainmeters near the epicenter of the Yiliang M_S5.7 earthquake in 2012 and the Ludian M_S6.5 earthquake in 2014 in the Zhaotong area, Yunnan Province. The results show that the analysis based on the perspective of plane strain and shear strain has an obviously better effect than that based on the component readings, and can directly peel off the respective abnormality of the plane strain and shear strain. In addition, the correlation coefficient curves between measured data of two plane strains show significant anomalies which often occur several days before and during the earthquake.

关键词： Four-component borehole strainmeter Ludian MS6. 5 earthquake Yiliang MS5. 7 earthquake Plane strain abnormality Shear strain abnormality Self-test of data Strain anomaly

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A Detection Method of Earthquake Precursory Anomalies Using the Four-Component Borehole strainmeter

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Open Journal of Earthquake Research 2018年第2期7卷 124-140页

作者： Xiangyang Kong Kaizhi Su Fujinawa Yukio Noda Yoichi Earthquake Administration of Shandong Province Jinan China Institute of Crustal Dynamics China Earthquake Administration (CEA) Beijing China Organization for Development of Resilient Communities Tokyo Japan Tierra-Tecnica Co. Ltd. Tokyo Japan

strainmeters have been used to detect earthquake precursory anomalies in many countries. An innovated four-component strainmeter with four sensing units set at 45 degrees intervals, named SKZ strainmeter, was developed and used in China. The design, with a few unique features, allows high-sensitivity monitoring of the regime of the crustal strain field, as well as the self-consistencies of the instrument. One of the most difficult problems in the earthquake precursory investigation is to efficiently detect anomalies from large amount of data. Pattern recognition of waveforms is widely used, but it is time-consuming and relies more or less investigator’s experience and decision. In this study, the consistency factors of the paired components were firstly shown to be utilized to detect anomalies possibly related with imminent earthquakes. Here, rather than using the consistency factors, the correlation coefficients of the two orthogonal strain data were used to detect. SKZ strainmeters have been installed at more than ten sites in China, exhibited high efficiency and reliability in precursory monitoring since. Anomalous variations from a few stations during two recent earthquakes in south China were analyzed. During normal stages, diurnal earth tides could be clearly observed with very little urban noises. Though the consistency factors may have near constant bias, their correlation coefficients remain near 1.0, greater than 0.99. During the imminent preparatory stage of earthquake occurrence, non-planar strain may appear and the correlation coefficients drop noticeably. The analysis showed that the correlation coefficient between the two orthogonal components is a useful parameter in post-processing of the strain data to detect precursory anomalies. The resultant resolving power is shown to be some one-order larger compared with previous methods.

关键词： Borehole strainmeter Earthquake Observation Technology Pre-Seismic Anomalies Data Filtering

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Studying of Deformation Processes by Two-Coordinate Laser strainmeter

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International Journal of Clean Coal and Energy 2013年第2期2卷 21-23页

作者： Grigory I. Dolgikh V.I. Il'ichev Pacific Oceanological Institute Far Eastern Branch of Russian Academy of Sciences Vladivostok Russia

The results of experimental data processing of a two-coordinate laser strainmeter are discussed. The two-coordinate laser strainmeter consists of two laser strainmeters which measuring shoulders are oriented along the lines “North- South” and “West-East”. Measurement accuracy of the earth's crust microdisplacements of these devices makes 0 to1 nm. Working frequency range is from 0 to 1000 Hz. Processing experimental data the main attention is paid to high tides, natural oscillations of the Earth, natural oscillations of geoblocks, superficial sea waves. It is established that after separate earthquakes the natural oscillations of regional geoblocks are strongly excited. Besides, it is revealed that quasiperiodic fluctuations of crust in the range of periods from 1 to 12 min. are caused by atmospheric processes. Besides, it is revealed that quasiperiodic oscillations of the earth's crust in the range of periods from 1 to 12 minutes are caused by atmospheric processes.

关键词： Two-coordinate Laser strainmeter High Tides Earthquakes Natural Oscillations of the Earth Natural Os-cillations of Geoblocks Natural Oscillations of Bays Superficial and Internal Sea Waves Quasiperiodic Oscillations

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