Pre-eruptive 2012 (2011–2012) | Dome | Pre-eruptive 2016 (2014–2016) | Pre 2019 (2016–2019) | |
---|---|---|---|---|
EQ | EQ swarm in August 2011 | LP high | ||
SO2 | High | High | ||
RSAM | High | High but decreases before | High | |
This study | ||||
Tremor | On in 2011 | On | On | On |
PSD | Tremor (2–5 Hz) | Gliding tremor | Tremor (2–5 Hz) | Tremor (2–5 Hz) |
DSAR | Decrease, but ~ 5 two months before | 3 to 4 | 4 | 3 to 4 |
LSC | Critically stressed | |||
dv/v | Stable | Not reliable | + 0.1% | + 0.4% followed by -0.2% |
Decorrelation | No | Not reliable | No | Yes |