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Table 1 Summary of the main changes associated with each unrest and eruptive period

From: A quest for unrest in multiparameter observations at Whakaari/White Island volcano, New Zealand 2007–2018

 

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

  1. We only list the most relevant observations