<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi, Tien-Huei-<div> The first thing to notice is that the time periods (epochs in SEED lingo)</div><div>are different, suggesting that these are indeed different sensors,</div><div>dataloggers, or other response characteristics.</div><div> You need to make sure that the information is correlated by time as well.</div><div> Hope this helps-</div><div> Rick</div><div><br></div><div><div><div>On Mar 14, 2012, at 11:57 AM, Tien-Huei Wang wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hi all,<div> I 've been using broadband data from IRIS on research and recently encounter a confusing thing about response.</div><div>I am using the BH* channels of network AZ, and it should be velocity data. I downloaded sac files from SCEC stp.</div>
<div>I originally request response file in SEED format, then extracted it to be RESP.AZ.XXX..BHX, the response file. </div><div>Recently, because I want to confirm the amplitudes in velocity and also in displacement is correct, I went to IRIS SeismiQuery to get the response file updated until 2011. Surprisingly, the extracted response file from my SEED format and the response file from SeismiQuery are different.</div>
<div>The RDSEED extracted response file has 2 zeros and 5 poles, but the response file from SeismiQuery has 5 zeros 9 poles.</div><div>I thought 2 zeros is standard for velocity response, had no idea what the 5 zeros are. They are from the same time span for same station. </div>
<div><br></div><div>Post front portion of RESP files</div><div>1. from RDSEED:</div><div>=================================</div><div><div># << IRIS SEED Reader, Release 4.7.5 >></div><div># </div>
<div># ======== CHANNEL RESPONSE DATA ========</div><div>B050F03 Station: RDM</div><div>B050F16 Network: AZ</div><div>B052F03 Location: ??</div><div>B052F04 Channel: BHE</div><div><font class="Apple-style-span" color="#b6170f" size="4">
B052F22 Start date: 2004,056,18:43:30</font></div><div><font class="Apple-style-span" color="#b6170f" size="4">B052F23 End date: No Ending Time</font></div><div># =======================================</div><div># + +--------------------------------------------+ +</div>
<div># + | Response (Poles & Zeros), RDM ch BHE | +</div><div># + +--------------------------------------------+ +</div><div>
# </div><div>B053F03 Transfer function type: A [Laplace Transform (Rad/sec)]</div><div>B053F04 Stage sequence number: 1</div><div>B053F05 Response in units lookup: M/S - velocity in meters per second</div>
<div>B053F06 Response out units lookup: V - emf in volts</div><div>B053F07 A0 normalization factor: 5.91892E+07</div><div>B053F08 Normalization frequency: 0.159155</div>
<div>B053F09 Number of zeroes: 2</div><div>B053F14 Number of poles: 5</div><div># Complex zeroes:</div><div># i real imag real_error imag_error</div>
<div>B053F10-13 0 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00</div><div>B053F10-13 1 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00</div><div># Complex poles:</div><div># i real imag real_error imag_error</div>
<div>B053F15-18 0 -3.701000E-02 3.701000E-02 0.000000E+00 0.000000E+00</div><div>B053F15-18 1 -3.701000E-02 -3.701000E-02 0.000000E+00 0.000000E+00</div><div>B053F15-18 2 -2.513000E+02 0.000000E+00 0.000000E+00 0.000000E+00</div>
<div>B053F15-18 3 -1.310000E+02 4.673000E+02 0.000000E+00 0.000000E+00</div><div>B053F15-18 4 -1.310000E+02 -4.673000E+02 0.000000E+00 0.000000E+00</div></div><div><br></div><div><br></div><div>2. from SeismiQuery</div>
<div>======================================</div><div><br></div><div><div>###################################################################################</div><div>#</div><div>B050F03 Station: RDM</div><div>B050F16 Network: AZ</div>
<div>B052F03 Location: ??</div><div>B052F04 Channel: BHE</div><div><font class="Apple-style-span" color="#b6170f" size="4">B052F22 Start date: 2000,264,20:11:00</font></div><div><font class="Apple-style-span" color="#b6170f" size="4">B052F23 End date: 2001,250,20:49:00</font></div><div>#</div><div># +-----------------------------------+</div>
<div># | Response (Poles and Zeros) |</div><div># | AZ RDM BHE |</div><div># | 09/20/2000 to 09/07/2001 |</div><div># +-----------------------------------+</div>
<div>#</div><div>B053F03 Transfer function type: A</div><div>B053F04 Stage sequence number: 1</div><div>B053F05 Response in units lookup: M/S - velocity in meters per second</div>
<div>B053F06 Response out units lookup: V - emf in volts</div><div>B053F07 A0 normalization factor: +5.74357E+12</div><div>B053F08 Normalization frequency: +2.00000E-01</div>
<div>B053F09 Number of zeroes: 5</div><div>B053F14 Number of poles: 9</div><div># Complex zeroes:</div><div># i real imag real_error imag_error</div>
<div>B053F10-13 0 +0.00000E+00 +0.00000E+00 +0.00000E+00 +0.00000E+00</div><div>B053F10-13 1 +0.00000E+00 +0.00000E+00 +0.00000E+00 +0.00000E+00</div><div>B053F10-13 2 -1.51500E+01 +0.00000E+00 +0.00000E+00 +0.00000E+00</div>
<div>B053F10-13 3 -3.18600E+02 +4.01200E+02 +0.00000E+00 +0.00000E+00</div><div>B053F10-13 4 -3.18600E+02 -4.01200E+02 +0.00000E+00 +0.00000E+00</div><div># Complex poles:</div><div># i real imag real_error imag_error</div>
<div>B053F15-18 0 -3.70000E-02 +3.70000E-02 +0.00000E+00 +0.00000E+00</div><div>B053F15-18 1 -3.70000E-02 -3.70000E-02 +0.00000E+00 +0.00000E+00</div><div>B053F15-18 2 -1.59900E+01 +0.00000E+00 +0.00000E+00 +0.00000E+00</div>
</div><div>...</div><div><br></div><div><br></div><div>Does anyone know why and how this will affect our final outcome? What are the outputs and will they be consistent?</div><div><br></div><div>Thanks,</div><div><br></div>
<div>--Tien</div>
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<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div><i><span class="Apple-style-span" style="font-family: 'Apple LiSung'; font-size: 14px; font-style: normal; "><div><font class="Apple-style-span" face="Cochin" size="3"><span class="Apple-style-span" style="font-size: 12px; font-family: Cochin; "><i style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; ">================</span></span></span></span></i></span></font></div><div><font class="Apple-style-span" face="Cochin" size="3"><span class="Apple-style-span" style="font-size: 12px; font-family: Cochin; "><i style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; ">Rick Benson</span></span></span></span></i></span></font></div><div><font class="Apple-style-span" face="Cochin" size="3"><span class="Apple-style-span" style="font-size: 12px; font-family: Cochin; "><i style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; ">Director of Data Management</span></i></span></font></div><div><font class="Apple-style-span" face="Cochin" size="3"><span class="Apple-style-span" style="font-size: 12px; font-family: Cochin; "><i style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; ">IRIS DMC</span></span></span></span></i></span></font></div><div><font class="Apple-style-span" face="Cochin" size="3"><span class="Apple-style-span" style="font-size: 12px; font-family: Cochin; "><i style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; ">(206)547-0393 ext. 119(office)</span></span></span></span></i></span></font></div><div><font class="Apple-style-span" face="Cochin" size="3"><span class="Apple-style-span" style="font-size: 12px; font-family: Cochin; "><i style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><span class="Apple-style-span" style="font-family: Cochin; font-size: 12px; font-style: italic; "><a href="mailto:rick@iris.washington.edu">rick@iris.washington.edu</a></span></span></span></span></i></span></font></div></span></i></div><div><br></div></span><br class="Apple-interchange-newline">
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