Plot colorbar shakemap

Dear all,

Is there any example hor to plot the shakemap legend from the earthquake?

I try to use gmt colorbar -Y-5 -Dx10c/1i/6i/0.25ih -Cshakemap.cpt -B1 but the result is different from the attached image.

Thank you very much

Susilo

gmt colorbar -Dx10c/1i/6i/0.25ih -Cshakemap.cpt -L -png t
seems pretty close. Of course all the annotations is a separate job.