Sensor trouble

This page describes abnormal strong motion data caused by sensor troubles.

Station NMW

• The N308°E component of the sensor on the east of basement floor (B1FE) at the station NMW has not been functioning since February, 2011. The 308-B1FE component (channel#8) of data files has strange signal.
• The sensor on the east of basement floor (B1FE) has been repaired in June, 2011.

Station NGY

• The up-down component of the sensor on the ground (GL) at the station NGY has not been functioning since February, 2011. The UP-GL component (channel#3) of data files has no signal.
• The sensor on the ground (GL) has been repaired in June, 2011.

Station SND

• The up-down component of the sensor 40 meters in the ground (G40) at the station SND has not been functioning since November, 2007. The UP-G40 component (channel#9) of data files has no signal.
• The N074°E component of the sensor 40 meters in the ground (G40) at the station SND has not been functioning since October 2008. The 074-G40 component (channel#7) of data files has no signal.

Station ANX

• The N180°E component of the sensor 14 meters in the ground A (A14) at the station ANX has not been functioning since July 2006. The 180-A14 component (channel#4) of data files has abnormal signal.
• The N180°E component of the sensor 5F of the main building (M5C) at the station ANX has not been functioning since December 9, 2009. The 180-M5C component (channel#58) of data files has earthquake-like signal, but amplitudes are not reliable.

Station MYK

• The the sensors on the first floor (01F9 and on the ground (GL) were damaged by tsunami caused by the 2011 Tohoku Earthquake. Some abnormal signals can be found records 30 minutes after the earthquake.
• The the sensor on the ground (GL) is still out of order. Channels 7 to 9 have been removed from data files since May, 2011.