Operators name: Aomi, K. Tanaka
Shift time: 16-24 (JST)

Summary:

Check Items:
VAC,CRY,TEMP were no any problems except for IYA FIELD TEMP.

The temperature in IYA FIELD area raised about 1.4 degrees at 17:46 JST(fig. 1), and we have noticed that the data of IYA_FIELD_TEMP on the web page is missing(fig. 2). 

Now, The temperature in IYA FIELD area was returned to the original value before rising, and the data on the Web page seems to be retaken.

16:00 OBSERVING from previous shift time
18:56 Lock loss due to earthquake (at Hokkaido M 6.2)

20:23 Restore OBSERVING state automatically
22:34 Lock loss due to earthquake
22:45 Restore OBSERVING state automatically

23:00 Lock loss due to earthquake
23:29 Restore OBSERVING state automatically

24:00 keep OBSERVING state