Following Sheila's entry (alog 21708), I've tried to figure out which locklosses where due to Earthquakes during the week of Sep 10th (ER8).
Out of the 22 locklosses seen this week, I've counted 6 locklosses due to EQs. Sheila counted 9, I'll double check my conclusions with her.
| EQ | Location | Ground Velocity at LHO | Status | Lock Loss time |
| 5.9 | Alaska | 5.99 microns/s | Lockloss | 1125916264.5625 |
| 5.2 | Mexico | 1.08 microns/s | Lockloss | 1126042739.0625 |
| 5.7 | New Zealand | 1.16 microns/s | Lockloss | 1126127070.8125 |
| 6.3 | Indonesia | 3.20 microns/s | Lockloss | 1126427496.4375 |
| 6.1 | Papua New Guinea | 2.90 microns/s | Lockloss | 1126448905.3125 |
| 8.3 | Chile | 170 microns/s | Lockloss + SEI trip | 1126480080.5625 |
The ground velocities represent the maximum amplitude predicted by the Seismon software. These predictions could be inaccurate by a few percents.
Six examples is not enough to do some accurate statistics, but the behavior observed during ER8 doesn't contradict the conclusions drawn from ER7 (see DCC T1500230). My conclusions were:
- Ground motion < 0.6microns/s: very unlikely to trip SEI or loose lock
- 0.6 < Ground motion < 8 microns/s: very unlikely to trip SEI but will probably loose lock
- 8 microns/s < Ground motion: would propbably trip SEI and loose lock
Note: among the 16 remaining locklosses, some of them are due to a high ground motion, but EQ is not the cause (wind? human activity?).