<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>All—<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am an employee of the US Defense Threat Reduction Agency at Ft Belvoir, and work in the explosion monitoring technology group. We are planning a series of underwater seismometer experiments in various fresh water and salt water sitings. I am trying to search the literature to learn how well an ocean bottom seismometer can be anchored, and wish to read technical reports which document OBS seismometer waveform comparison to topside (terrestrially-based) waveforms against the same seismic source. We will be using explosive sources during our experiments, but there is little confidence right now among test planners that bottom anchored seismometers can in fact be anchored in bedrock locations where seismic waveforms can be expected to reproduce terrestrially measured waveforms. Can anyone refer me to such technical literature describing such waveform comparisons? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Ken Grimm<o:p></o:p></p></div></body></html>