supws.su.main

su 的源代码库

 SUPWS - Phase stack or phase-weighted stack (PWS) of adjacent traces	
	 having the same key header word				

 supws <stdin >stdout [optional parameters]				

 Required parameters:							
	none								

 Optional parameters:						 	
	key=cdp	   key header word to stack on				
	pwr=1.0	   raise phase stack to power pwr			
	dt=(from header)  time sampling intervall in seconds		
	sl=0.0		window length in seconds used for smoothing	
			of the phase stack (weights)			
	ps=0		0 = output is PWS, 1 = output is phase stack	
	verbose=0	 1 = echo additional information		

 Note:								 	
	Phase weighted stacking is a tool for efficient incoherent noise
	reduction. An amplitude-unbiased coherency measure is designed	
	based on the instantaneous phase, which is used to weight the	
	samples of an ordinary, linear stack. The result is called the	
	phase-weighted stack (PWS) and is cleaned from incoherent noise.
	PWS thus permits detection of weak but coherent arrivals.	

	The phase-stack (coherency measure) has values between 0 and 1.	

	If the stacking is over cdp and the PWS option is set, then the	
	offset header field is set to zero. Otherwise, output traces get
	their headers from the first trace of each data ensemble to stack,
	including the offset field. Use "sushw" afterwards, if this is
	not acceptable.							


 
 Author: Nils Maercklin, 
	 GeoForschungsZentrum (GFZ) Potsdam, Germany, 2001.
	 E-mail: [e-mail]

 References:
	B. L. N. Kennett, 2000: Stacking three-component seismograms.
	 Geophysical Journal International, vol. 141, p. 263-269.
	M. Schimmel and H. Paulssen, 1997: Noise reduction and detection
	 of weak , coherent signals through phase-weighted stacks.
	 Geophysical Journal International, vol. 130, p. 497-505.
	M. T. Taner, A. F. Koehler, and R. E. Sheriff, 1979: Complex
	 seismic trace analysis. Geophysics, vol. 44, p. 1041-1063.

 Trace header fields accessed: ns
 Trace header fields modified: nhs, offset