Publication Date:
2018-10-16
Description:
The determination of the accurate orientation of seismometer sensors is critical for measuring seismic observations from three‐component (3C) sensors. However, aligning a 3C seismometer to the true orientation in the field, especially the two horizontal components of sensors, is not an easy task. Thus, orientation correction is usually carried out in the stage of seismic data processing. In this study, we systematically compare the orientation correction method based on earthquake data with that based on ambient‐noise cross correlations (CCs). Based on our investigation, we draw the following conclusions: (1) orientation measurements based on ambient‐noise CCs are consistent with those based on earthquake data. Moreover, orientation measurements based on long‐term CCs of ambient noise are more reliable than those based on teleseismic earthquakes; (2) orientation measurements of sensors on land based on relatively long‐period (20–50 s) ambient‐noise CCs are more stable than those based on short‐period (10–20 s) ones; and (3) orientation measurements based on ambient‐noise CCs using only one month of noise data are still reliable and stable.
Print ISSN:
0037-1106
Electronic ISSN:
1943-3573
Topics:
Geosciences
,
Physics
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