Body and Surface Wave Modeling of Observed Seismic Events

1978 ◽  
Author(s):  
David G. Harkrider ◽  
Donald V. Helmberger ◽  
J. B. Minster
Keyword(s):  
Surface Wave ◽  
Seismic Events ◽  
Wave Modeling

Body and Surface Wave Modeling of Observed Seismic Events

1981 ◽  
Author(s):  
David G. Harkrider ◽  
Donald V. Helmberger ◽  
William J. Best
Keyword(s):  
Surface Wave ◽  
Seismic Events ◽  
Wave Modeling

Body and Surface Wave Modeling of Observed Seismic Events

1976 ◽  
Author(s):  
David G. Harkrider ◽  
Donald V. Helmberger
Keyword(s):  
Surface Wave ◽  
Seismic Events ◽  
Wave Modeling

Body and Surface Wave Modeling of Observed Seismic Events

1979 ◽  
Author(s):  
David G. Harkrider ◽  
Donald V. Helmberger ◽  
J. Bernard Minster
Keyword(s):  
Surface Wave ◽  
Seismic Events ◽  
Wave Modeling

Body and Surface Wave Modeling of Observed Seismic Events

1986 ◽  
Author(s):  
David G. Harkrider ◽  
Donald V. Helmberger ◽  
Robert W. Clayton
Keyword(s):  
Surface Wave ◽  
Seismic Events ◽  
Wave Modeling

Surface wave attenuation of seismic records with the co-core trace transform filter

Geophysics ◽  
2011 ◽  
Vol 76 (6) ◽  
pp. V115-V128 ◽  
Author(s):  
Ning Wu ◽  
Yue Li ◽  
Baojun Yang
Keyword(s):  
Surface Wave ◽  
Surface Waves ◽  
Field Data ◽  
Wave Attenuation ◽  
Seismic Events ◽  
Data Sets ◽  
Transform Domain ◽  
Recent Developments ◽  
Seismic Records ◽  
Trace Transform

To remove surface waves from seismic records while preserving other seismic events of interest, we introduced a transform and a filter based on recent developments in image processing. The transform can be seen as a weighted Radon transform, in particular along linear trajectories. The weights in the transform are data dependent and designed to introduce large amplitude differences between surface waves and other events such that surface waves could be separated by a simple amplitude threshold. This is a key property of the filter and distinguishes this approach from others, such as conventional ones that use information on moveout ranges to apply a mask in the transform domain. Initial experiments with synthetic records and field data have demonstrated that, with the appropriate parameters, the proposed trace transform filter performs better both in terms of surface wave attenuation and reflected signal preservation than the conventional methods. Further experiments on larger data sets are needed to fully assess the method.

LONG‐PERIOD SIGNAL PROCESSING RESULTS FOR THE LARGE APERTURE SEISMIC ARRAY

Geophysics ◽  
1969 ◽  
Vol 34 (3) ◽  
pp. 305-329 ◽  
Author(s):  
J. Capon ◽  
R. J. Greenfield ◽  
R. T. Lacoss
Keyword(s):  
Signal Processing ◽  
Surface Wave ◽  
Maximum Likelihood ◽  
Surface Waves ◽  
Body Wave ◽  
Seismic Array ◽  
Seismic Events ◽  
Long Period ◽  
Large Aperture ◽  
Period Data

The results of a series of off‐line signal processing experiments are presented for long‐period data obtained from the Large Aperture Seismic Array (LASA) located in eastern Montana. The signal‐to‐noise ratio gains obtained with maximum‐likelihood processing, as well as other simpler forms of processing, are presented for body‐wave as well as surface‐wave phases. A discussion of the frequency‐wavenumber characteristics of the noise which led to these results is also given. On the basis of these experiments, several recommendations are made concerning optimum long‐period array configurations and on‐line or off‐line processing methods. The usefulness of maximum‐likelihood processing in suppressing an interfering teleseism is demonstrated. An experiment is given in which maximum‐likelihood processing achieved about 20 db suppression of an interfering teleseism, while simpler forms of processing such as beam‐forming obtained about 11 db. The matched filtering of surface waves using chirp waveforms is shown to be highly effective. A useful discriminant for distinguishing between natural seismic events and underground nuclear explosions, using both the long‐period and short‐period data, was found to be the relationship between the surface‐wave and body‐wave magnitudes. Measurements of this discriminant made on events from four tectonic regions of the earth are presented. It is shown that 60 and 100 percent detectability of surface waves for natural seismic events from the Central Asian‐Kurile Islands‐Kamchatka region occurs at about LASA body‐wave magnitudes 4.5 and 4.9, respectively.

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