Changes between Version 1 and Version 2 of gmew


Ignore:
Timestamp:
05/09/12 10:24:11 (8 years ago)
Author:
branden
Comment:

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  • gmew

    v1 v2  
    1818The instrument response is removed, and acceleration, velocity and displacement traces are computed. In addition, spectra response data is computed for the three periods of 0.3 seconds, 1.0 seconds, and 3.0 seconds, with 0.5% damping. All six of these traces are computed in the frequency domain, since integration or differentiation are easily computed there. The spectral response traces are computed by generating the response function for a one degree of freedom harmonic oscillator with the specified free period and damping. All six of these synthetic traces are then transformed back to the time domain by an FFT that handles multiple arrays simultaneously. 
    1919 
    20 (5/10/11) If one or more <AddSpectraResponseAt> commands are included in the config file, then those periods will be computed instead of the standard ones listed above. This does not affect what gets written to the ShakeMap XML. 
     20(5/10/11) If one or more <!AddSpectraResponseAt> commands are included in the config file, then those periods will be computed instead of the standard ones listed above. This does not affect what gets written to the !ShakeMap XML. 
    2121 
    2222When the synthetic traces have been returned to the time domain, the peak amplitudes are located for each trace. The search for peak amplitude is done within a time window related to the estimated S-phase arrival time and specified in the configuratiion file. 
    2323 
    24 Gmew writes a TYPE_STRONGMOTIONII message for each SCNL that it processes. This message contains the PGA, PGV, PGD and spectral response values for the SCNL. In addition, the user can configure gmew to write an XML file for the entire event. This file is in the format used by ShakeMap (version 2) for station readings. 
     24Gmew writes a TYPE_STRONGMOTIONII message for each SCNL that it processes. This message contains the PGA, PGV, PGD and spectral response values for the SCNL. In addition, the user can configure gmew to write an XML file for the entire event. This file is in the format used by !ShakeMap (version 2) for station readings. 
    2525 
    2626Some warnings about this program: Currently gmew does not know to wait for trace data to appear in the wave_servers. So when run as an Earthworm module, it may not be able to obtain enough trace data for adequate processing. You may want to run gmew manually after all the desired trace data has accumulated in the wave_server.