Changes between Initial Version and Version 1 of ShmDocMenuAmplitudeMb


Ignore:
Timestamp:
02/05/2009 10:54:26 AM (14 years ago)
Author:
MarcusWalther
Comment:

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  • ShmDocMenuAmplitudeMb

    v1 v1  
     1= Menu entry mb = 
     2 
     3Determines body wave magnitude for teleseismic signals. It needs an amplitude measurement on one or more P waves before, by convention read from '''WWSSN-SP''' simulated traces. The steps to perform to come to a magnitude determination are: 
     4 
     5    * Make a source location (e.g. using [ShmDocMenuLocateLocateTele Locate Tele]) or enter a known location into the [ShmDocDialogAnalysisParameter analysis parameter box]. 
     6    * Apply the WWSSN-SP [ShmDocFilterSimulation simulation filter]. 
     7    * Measure amplitudes of '''P''' waves ([ShmDocMenuAmplitudeAmplitudePeriodAutoPeak Ampl & Period auto Peak], [ShmDocMenuAmplitudeAmplitudePeriodAutoZero Ampl & Period auto Zero]) 
     8    * Select the menu entry '''''mb'''''.  
     9 
     10From all P amplitudes determined a magnitude will be computed. The formula applied is 
     11 
     12{{{ 
     13#!c 
     14mb = log10(ampl/period) + sigma(distance) 
     15}}} 
     16 
     17where sigma is (from 16 deg to 120 deg in steps of 1 deg): 
     18 
     19{{{ 
     205.9,5.9,5.9,6.0,6.0,6.1,6.2,6.3,6.3,6.5,6.4,6.5,6.6, 
     216.6,6.6,6.7,6.7,6.7,6.7,6.7,6.6,6.5,6.5,6.4,6.4,6.5,6.5,6.5,6.5, 
     226.7,6.8,6.9,6.9,6.8,6.7,6.7,6.7,6.7,6.8,6.8,6.8,6.8,6.8,6.8,6.8, 
     236.6,7.0,6.9,7.0,7.0,7.0,7.0,7.0,7.0,6.9,6.9,6.9,6.9,6.8,6.8,6.9, 
     246.9,6.9,6.8,6.7,6.8,6.9,7.0,7.0,7.0,6.9,6.9,7.1,7.0,7.0,7.1,7.1, 
     257.2,7.1,7.2,7.3,7.4,7.5,7.5,7.4,7.3,7.4,7.5,7.6,7.7,7.8,7.9,7.9, 
     268.0,8.1,8.2,8.2,8.4,8.6,8.7,8.8,8.9,9.0,9.0,9.0 
     27}}} 
     28 
     29---- 
     30back to [ShmDocIndex documentation index]