Changes between Version 6 and Version 7 of localmag


Ignore:
Timestamp:
05/13/12 10:41:45 (8 years ago)
Author:
branden
Comment:

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  • localmag

    v6 v7  
    297297Specify the file containing the table of attenuation factors ( -log(A0) ) used in the local magnitude calculation. This file mist start with two commands: 
    298298Dist type: Identify which distance is to used to access this table. Choices are: 
    299 * epi: station - epicenter distance 
    300 * hypo: station - hypocenter distance (uses event depth but not station depth.) 
    301 * nDist N: The number of table entries that follow is at most N. 
     299 * epi: station - epicenter distance 
     300 * hypo: station - hypocenter distance (uses event depth but not station depth.) 
     301 * nDist N: The number of table entries that follow is at most N. 
    302302 
    303303Following these two commands are up to N lines of distance and -logA0 values. The distance numbers must be integer values, in kilometers. The -logA0 values are positive decimal values. Entries MUST be in order of increasing distance. When this table is used to find the -logA0 value, the entry with distance nearest to the desired distance will be used. As of June 30, 2011, the attenuation relationship allows for vertical components to have a separate attenuation curve as an option with the allowVerticals configuration parameter. This is to allow those networks (like LCSN) who have computed attenuation on verticals to compute ML on vertical (Z) channels. The EasternUS.tab is provided with the release of localmag now as an example of 2 attenuation curves specified. If the desired distance exceeds the largest distance in this table, then the -logA0 value for the last table entry will be returned. The file Richter.tab provided with the localmag program contains the table established by Richter & Guttenberg for Southern California. Note that localmag will try to read the logA0 file from the current directory. Specify the appropriate path information if the file is located elsewhere.