Bad segment # (from webpage) and brief explanatory text 100 Train & microseism 99 Construction/logging 98 Short segment, with anthro noise and a deep glitch 97 Some anthro noise, but mostly high-power badness 96 Earthquake 95 Train 94 Big, unexplained excess noise (probably a bias module, similar to #10) 93 Earthquake 92 Train/microseism 91 Wind, and a long warm-up period 90 Big, unexplained glitch at the start; logging 89 Nasty glitching period, probably electronics 88 Wind? 87 Train 86 Earthquake 85 Train, recovery from earthquake 84 Small train 83 Train 82 Deep glitches; not sure why. 81 Earthquake 80 Sporadic glitching, probably related to bad WFS cables or electronics 79 Big seismic spike, as well as some upconversion from wind 78 Same as #79 77 Earthquake 76 Logging 75 No explanation. Beginning-of-run glitching. 74 Train 73 Earthquake 72 See #75 71 Earthquake 70 Wind/earthquake/microseism, plus a big glitch 69 Train 68 Trains 67 Steadily Sinking Sensemon (bias module - same as #10) 66 See #5 65 Train 64 Earthquake, 5.7, Peru. 63 Beginning-of-run glitches (no explanation) 62 Earthquake 61 TS Ernesto 60 Earthquake 59 Unexplained glitching; possibly related to bad HEPI PenTek 58 No explanation, but lots of seismic noise. 57 Some logging & wind; no good explanation 56 High microseism 55 Just before a train, but no clear reason for deep glitches 54 Lots of wind and microseism 53 Same as #54 52 Wind and anrthopogenic seismic noise, leading to saturations of the PDs 51 Train 50 No clear explanation, but SEC construction was frequently mentioned in ops logs 49 HEPI configuration was off-nominal (a FIR filter wasn't turned on) 48 An ugly segment ended by a train. There were ongoing problems with HEPI for ITMX (it turned out to be a broken PenTek) 47 See #5 46 No explanation. Probably related to saturations due to high-power operations 45 Very high microseism, and a train 44 See #48. 43 Train (and an unexplained deep glitch) 42 An ETM drumhead mode changed frequency due to a temperature change in the endstation. The big, undamped internal mode oscillations (around 7kHZ) saturated the front end processors and created gain peaking in the DARM loop. 41 Segment begins during WFS2 oscillation (?), ends at a train. 40 See #6 39 Short segment dominated by IFO warm-up, plus a deep glitch 38 Busted LVEA seismometer 37 Wind, construction noise, and a large x-end seismic spike 36 Same as #38 35 TS Ernesto 34 Small earthquake, small train 33 Post-commissioning glitches, noted in ops log. Saturations in AS1. 32 Wind and microseism, same as #53 and 54 31 Microseism, noted in ops log 30 See #48 29 No clear cause for glitches. The microseism was high, but the glitches began (and ended) spontaneously) 28 Segment ended by logging. There was no clear explanation for deep glitches before the seismic noise increased. 27 The glitches at the end of this short segment are due to an approaching train. Also, the IFO was warming up, and the microseism was elevated. 26 Earthquake 25 A very short segment (2,111 seconds) with high microseism from TS Ernesto and one deep glitch. 24 Train 23 From the scimon's report on this segment: "About 20 minutes into the segment, there were a couple of big glitches, and about 15 minutes later, it got really glitchy, same as yesterday; the segment ended with an AS trigger, and the next (short) segment ended with lock loss.... Most (but not all) the glitches produced LSC overflows in ASQ1-4, but not in ASI or ASI_CORR or ASC." 22 Segment ends due to a train. This was shortly after the SPOB PenTek failure. The ongoing efforts to debug that problem caused some minor trouble with WFS1, which led to elevated ASI during this segment. 21 I think RBS saturated at the very end of the lock, making the IFO a little noisy for a few minutes. This was shortly after the new PMC was installed to increase the power into the IFO, and we hadn't yet adjusted our compensation loops. 20 An earthquake in Panama reduced the sensitivity just before it activated the AS trigger. 19 Beginning-of-run glitches. They were noted, but not explained, in the elog. 18 Glitches caused by a combination of high-power operations and elevated microseism. This was shortly after the August 06 commissioning break, when we were trying to push the envelope a bit. 17 Earthquake 16 Tropical Storm Ernesto.