Time correction and clock stability of ocean bottom seismometer using recorded seismograms
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- Isse Takehi
- Earthquake Research Institute, the University of Tokyo
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- Takeo Akiko
- Earthquake Research Institute, the University of Tokyo
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- Shiobara Hajime
- Earthquake Research Institute, the University of Tokyo
Bibliographic Information
- Other Title
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- 観測記録を用いた海底地震計の時刻補正と刻時安定性
Abstract
Ocean bottom seismometer records seismograms using a clock in a recorder. The recorder has a very precise clock although a few seconds of time shift occurs during a one-year seafloor observation. Usually, we measure time difference between a recorder's clock and a GPS clock before and after an observation and calibrate recordings. Recently, we could not apply this method because of some trouble in a recorder. In this report, we show that we can estimate a time drift of recorder's clock using observed seismograms and calibrate recordings. One easy method to estimate a time drift is to measure a temporal change of differential travel time residuals of first P-wave between two stations. Other method is to measure a temporal change of ambient noise cross correlation function of two stations. In our recent seafloor observation by “Normal Oceanic Mantle project”, we had two troubled recorders of broadband ocean bottom seismometers (NM02, NM20). We have applied these methods and estimated time drifts of these two recorder's clocks as-10.49 ms/day, and -1.9 ms/day, respectively. We have also found that clock stability of these recorder's clocks is very well during seafloor observation from recordings by temporal change of cross correlation function and that a precision of the recorder's clock is well less than 100ms.
Journal
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- JAMSTEC Report of Research and Development
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JAMSTEC Report of Research and Development 19 (0), 19-28, 2014
Japan Agency for Marine-Earth Science and Technology
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Keywords
Details 詳細情報について
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- CRID
- 1390001205317850880
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- NII Article ID
- 130005068726
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- ISSN
- 2186358X
- 18801153
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed