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Crosscorrelation of Earthquake Data Using Stationary Phase Evaluation : Insight into Reflection Structures of Oceanic Crust Surface in the Nankai Trough
Joint Authors
Minato, Shohei
Obana, Koichiro
Matsuoka, Toshifumi
Tsuji, Takeshi
Source
International Journal of Geophysics
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-06-12
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
Seismic interferometry (SI) has been recently employed to retrieve the reflection response from natural earthquakes.
We perform experimental study to apply SI to Ocean Bottom Seismogram (OBS) records in the Nankai Trough, southwest Japan in order to reveal the relatively shallow geological boundaries including surface of oceanic crust.
Although the local earthquakes with short raypath we use to retrieve reflection response are expected to contain the higher-frequency components to detect fine-scale structures by SI, they cannot be assumed as plane waves and are inhomogeneously distributed.
Since the condition of inhomogeneous source distribution violates the assumption of SI, the conventional processing yields to the deteriorated subsurface images.
Here we adopt the raypath calculation for stationary phase evaluation of SI in order to overcome this problem.
To find stationary phase, we estimate the raypaths of two reflections: (1) sea-surface P-wave reflection and (2) sea-surface multiple P-wave reflection.
From the estimated raypath, we choose the crosscorrelation traces which are expected to produce objective reflections considering the stationary phase points.
We use the numerical-modeling data and field data with 6 localized earthquakes and show that choosing the crosscorrelation traces by stationary phase evaluation improves the quality of the reflections of the oceanic crust surface.
American Psychological Association (APA)
Minato, Shohei& Tsuji, Takeshi& Matsuoka, Toshifumi& Obana, Koichiro. 2012. Crosscorrelation of Earthquake Data Using Stationary Phase Evaluation : Insight into Reflection Structures of Oceanic Crust Surface in the Nankai Trough. International Journal of Geophysics،Vol. 2012, no. 2012, pp.1-8.
https://search.emarefa.net/detail/BIM-446384
Modern Language Association (MLA)
Minato, Shohei…[et al.]. Crosscorrelation of Earthquake Data Using Stationary Phase Evaluation : Insight into Reflection Structures of Oceanic Crust Surface in the Nankai Trough. International Journal of Geophysics No. 2012 (2012), pp.1-8.
https://search.emarefa.net/detail/BIM-446384
American Medical Association (AMA)
Minato, Shohei& Tsuji, Takeshi& Matsuoka, Toshifumi& Obana, Koichiro. Crosscorrelation of Earthquake Data Using Stationary Phase Evaluation : Insight into Reflection Structures of Oceanic Crust Surface in the Nankai Trough. International Journal of Geophysics. 2012. Vol. 2012, no. 2012, pp.1-8.
https://search.emarefa.net/detail/BIM-446384
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-446384