<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dear Colleague,<br><br>I want to inform you of an important forum on the "Frequency<br>Dependence of Seismic Q" in the journal Pure and Applied Geophysics<br>(PAGEOPH)." The first phase of that forum is now in place with the<br>on-line publication of a prologue and two papers on the PAGEOPH <br>web link.<br><br>Prologue by B. Mitchell - 10.1007/s00024-010-0180-3<br><a href="http://www.springerlink.com/content/66005367hwt97310/">http://www.springerlink.com/content/66005367hwt97310/</a><br><br>Article by I. Morozow - 10.1007/s00024-010-0100-6<br><a href="http://www.springerlink.com/content/62u717hu0rlu4h35/">http://www.springerlink.com/content/62u717hu0rlu4h35/</a><br><br>Article by J. Xie - 10.1007/s00024-010-0188-8<br><a href="http://www.springerlink.com/content/w2r05p8u0504t78t/">http://www.springerlink.com/content/w2r05p8u0504t78t/</a><br><br><br>The two authors, Igor Morozov and Jiakang Xie, have long been<br>prominent in seismic Q studies. They take different sides in a debate<br>on the merits of a new method developed by Dr. Morozov for inverting<br>seismic attenuation data and on the reality of features in the<br>resulting Q models.<br><br>I invite you to read the papers and to join us in the second phase of<br>the forum by submitting a one- or two-page comment on the merits (or<br>lack thereof) you assign to the new methodology. If you wish to<br>participate please send your comment to me, on an email attachment, at<br><a href="mailto:bmitche8@slu.edu">bmitche8@slu.edu</a> by October 15th. There will be no publication cost<br>for your submission. PAGEOPH will publish all accepted comments (with<br>light review) in its December issue so it is important to submit your<br>comments by the due date.<br><br>Brian Mitchell <div><br></div><div><br></div></body></html>