<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi,<div><br></div><div>The ground motion to intensity conversion equation (GMICE) can be selected by the operator. Wald99 is one option, though you may find AK07 (Atkinson & Kaka, 2007) works better for your environment. The other module that's currently available is FM2010. The complete references for all of these modules are near the top of their source files. There is the also the option to implement your own GMICE -- simply base the interface on one of the existing modules.</div><div><br></div><div>You make a good point about the PGA and PGV values, since these may be just one source of data in the intensity map, and the relationship between the PGA and PGV in the scale and intensity has always been a bit loose. For Wald99 we actually use a ramp function from MMI 5 to MMI 7 that transitions from MMI derived from PGA to MMI derived from PGV. But the correlation between intensity level and felt effects and damage remains valid, and I think the PGA and PGV values are still valuable as guides to instrumental intensity. However, if operators would like the option to remove the PGA and PGV from the scale, we would take it under advisement.</div><div><br></div><div>Bruce</div><div><br></div><div><br><div><div>On Dec 9, 2010, at 7:03 PM, WSC wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hi,<div><br><div>I have two questions about the Intensity Scale:</div><div>1、Is the Intensity Scale derived from Wald99(a and b)?</div><div> As we know,there are about four I=f(pga,pgv)equations from Wald99(a,b), i think the intensity is consitent with these four equations, isn`t it?<br><div>2、if so,can we still use the Intensity scale to represent the intensity map??</div><div>I think the intensity in SM3.5 now is obtained by weighted the ovbservation data,the converted data based on wald99(P->M) and estimated data(IPE),now the intensity data includes not only the P->M data,but observations and IPE derived intensity data,so now we still use this Intensity scale to reprensent the intensity map,is it reasonble?</div></div><div><br></div><div>Thanks,</div><div>WSC</div><div><br></div><div><br></div><div><br></div></div><br><br><span title="neteasefooter"><span id="netease_mail_footer"><hr> <a href="http://help.163.com/special/007525G0/163mail_guide.html?id=2716" target="_blank">网易163/126邮箱百分百兼容iphone ipad邮件收发</a> </span></span>_______________________________________________<br>Shake-dev mailing list<br><a href="mailto:Shake-dev@geohazards.usgs.gov">Shake-dev@geohazards.usgs.gov</a><br>https://geohazards.usgs.gov/mailman/listinfo/shake-dev<br></blockquote></div><br></div></body></html>