<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dear Bruce, shake-dev,<div><br></div><div>I have been working on our ShakeMap v3.5 installation in Switzerland.</div><div><br></div><div>I noticed something peculiar with the behaviour of the intensity bias.</div><div><br></div><div>I have the observed PGA and PGV from a M3.3 in Switzerland. (To be safe, I used Small as the GMPE and Wald99 as the GMICE. The behaviour is similar when I use our Swiss-specific GMPE and GMICE.)</div><div><br></div><div>When I run this event with the observed PGM as input, there are large bias values for PGA and PGV, -1.5 and -0.7. (Those are expected, as PGA and PGV in Switzerland tend to be lower for a given magnitude than predicted by California relationships.) What troubles me is that the intensity magnitude bias turns out positive (1.43). </div><div><br></div><div>If I run a shakemap for this event without the PGM as input (just providing the event.xml file), the maximum intensity is 3.64. When I run it with the PGM as input, the maximum intensity is 5.1, even though the PGA and PGV biases are both negative. </div><div><br></div><div>I've run this same event on our v3.2 installation, and there, it seems to behave as I expect, where if the PGA and PGV biases are negative, the maximum intensity using the PGM observations will be lower than when running it without the observations.</div><div><br></div><div>I am attaching the message logs from running shake, grind.conf, the info.xml file, as well as the regression plots.</div><div><br></div><div>I am not sure where I am going wrong. Thanks in advance for your help.</div><div><br></div><div>Georgia</div><div><br></div><div>PS. When there is no native intensity data provided as input, and no IPE is specified, should the intensity bias still calculated? </div><div><br></div><div></div></body></html>