times because two distinct types of tremor were
seen preceding the eruption.
Volcano Name
and Date of
Summit
Eruption
Stat.
Visual tremor arrival ALERT tremor detection
Summit
Eruption
Time
Max
Warning
Time
2.0-4.0
Hz
1.0-2.0
Hz
0.5-1.0
Hz
2.0-4.0
Hz
1.0-2.0
Hz
0.5-1.0
Hz
Grímsvötn
Dec. 28, 1998
skr
03:35,
09:12
03:
36,
09:01
03:35,
08:58
03:40,
08:21
03:40
/media/vedurstofan-utgafa-2021/VI_2021_008.pdf