[Shake-dev] Bls: ShakeMap Update r1604

[Bruce Worden]

Hi,

ShakeMap produces maps using the component normally referred to as “largest of two horizontal.” That is, the software looks at the horizontal components and selects the greater amplitude for each ground motion type. Most GMPEs do not produce this component — most of the GMPEs in ShakeMap produce geometric mean, random component, average component, or other. In these cases, we convert the GMPE’s ground motions to largest of two horizontal using the conversion equations of Beyer and Bommer. (I’ve attached the reference. Note that they call the largest of two horizontal component “Env”, or “Envelope of x and y spectra."). If you wish to use geometric mean, you could use the conversion factors from Beyer and Bommer to convert the grids.

Bruce



> On Aug 21, 2017, at 6:47 AM, sigit pramono <sigit_muslim at yahoo.com> wrote:
> 
> Hi Bruce,
> 
> I would like to thanks with the information for updating shakemap for the last version.
> By the way, Bruce and all...Could you please help me to know when I used the shakemap composite (modelling and real PGA from instrument), when the last plot in shakemap product, so we can get information the geometric mean for all site or any particular site where is any accelerometer or PGA value from instrument would be plotted real PGA from instrument or Geomteric mean too? like PGA from GMPE?    
> if not geomteric mean from instrument, which one component which is plotted in the last shakemap product.
> 
> 
> 
> Pada Senin, 14 Agustus 2017 22:21, Bruce Worden <cbworden at gmail.com> menulis:
> 
> 
> Hi all,
> 
> Attached are files with information on the latest release of ShakeMap 3.5. Please let me know if you encounter any problems with the upgrade.
> 
> We are steadily making progress on ShakeMap 4.0 and hope to have more information soon.
> 
> Best,
> Bruce
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