ON MEASURING MISORIENTATION OF SEISMIC SENSORS USING AMBIENT NOISE DATA

Publish Year: 1398
نوع سند: مقاله کنفرانسی
زبان: English
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SEE08_301

تاریخ نمایه سازی: 23 آبان 1399

Abstract:

The dependence of the results of many seismic studies (e.g. seismic anisotropy, extracting Love wave from ambient noise data, measuring wave amplitude and receiver functions) to the accuracy of seismic sensor’s orientation are experienced many times. Therefore, the misorientation correction of seismic data in such studies must be taken into account seriously. Aligning the seismometer to the true geographical orientation is harder than it seems. Usually, a magnetic compass is used to estimate the geographic orientation in the sensor deployment stage. In this case, the accuracy of determining the true geographic orientation is affected by a variety of factors such as the presence of magnetic and mineral resources near the installation location and the lack of declination correction which is more important in high-latitude regions. In addition, althoughfiberoptic gyrocompass is very accurate to determine true geographic orientation, the cost and weight of such equipment prevents its usage widely (Wang et al., 2016). Due to such reasons, seismograms analysis has been considered as a new tools to correct misorientation of the sensors in the recent years. There are two main methods for correcting misorientation of seismometers by seismograms analysis. The first one is based on the polarization analysis of long-period Rayleigh waves (25- 50 s) or intermediate period P-waves (10-25 s) generated by telesismic earthquakes. The second method, which is used in this paper, is based on the analysis of empirical green functions through the cross correlation of ambient noise data. However, synthetic methods can be used for removing misorientation which is computationally expensive. In this paper, we estimatedmisorientation of the sensors for IIEES and IRSC seismic networks using the method developed by Zha et al. (2013) based on ambient noise analysis. First, we assumed that station A has a misorientation ψ (Figure 1).

Authors

Ramin MOVAGHARI

Ph.D. Candidate, IIEES, Tehran, Iran

Gholam JAVAN DOLOEI

Assistant Professor, IIEES, Tehran, Iran

Yingjie YANG

Associate Professor, Macquarie University, Sydney, Australia