The monsters wakes up ! Katla Hekla Iceland Dead Zone and rift as uniform system ! A lot of others worldwide !

about Hekla (not for you, special "fearmonger's edition")

In Icelandic Hekla is the word for a short hooded cloak which may relate to the frequent cloud cover on the summit. An early Latin source refers to the mountain as Mons Casule.[2]

After the eruption of 1104, stories (which were probably spread deliberately through Europe by Cistercian monks) told that Hekla was the gateway to Hell.[3]
The Cistercian monk Herbert of Clairvaux wrote in his De Miraculis (without naming Hekla):

The renowned fiery cauldron of Sicily, which men call Hell's chimney ... that cauldron is affirmed to be like a small furnace compared to this enormous inferno.[4]
—Herbert of Clairvaux, Liber De Miraculis, 1180
A poem by the monk Benedeit from circa 1120 about the voyages of Saint Brendan mentions Hekla as the prison of Judas.

The Flatey Book Annal wrote of the 1341 eruption that people saw large and small birds flying in the mountain's fire which were taken to be souls.[5] In the 16th century Caspar Peucer wrote that the Gates of Hell could be found in "the bottomless abyss of Hekla Fell". The belief that Hekla was the gate to Hell persisted until the 1800s.[4] There is still a legend that witches gather on Hekla for Easter.[6]
[link to en.wikipedia.org]

Herbert of Clairvaux (d. c.1198) Monk at *Clairvaux (1153–68/9), abbot of Mores in *Champagne until 1178; later archbishop of Torres, *Sardinia (1181).
[link to www.oxfordreference.com]

PAX INTRANTIBUS - SALUS EXEUNTIBUS
CONCORDIA HABITANTIBUS
[link to www.ocist.org]

Detail of Abraham Ortelius' 1585 map of Iceland showing Hekla in eruption. The Latin text translates as "The Hekla, perpetually condemned to storms and snow, vomits stones under terrible noise" :
[link to upload.wikimedia.org]


Olaus Magnus - On Strange Properties of Some Mountains:
[link to upload.wikimedia.org]



In the 1947 eruption, the last really big one, 14 m (46 ft) were added to its summit. In that eruption the volcano spewd up a column of ash as high as 28 000 meters into the atmosphere. The ash fell as far away as Russia.

Year
Duration
Lava and ash, km³
Destruction

1104
Unknown
2,5
Much

1158
Unknown
0,15
Some

1206
Unknown
0,03
Some

1222
Unknown
0,01
Little

1300-01
12 mo.
1,0
Much

1341
Unknown
0,08
Much

1389-90
Unknown
1,0
Some

1440
Unknown
Unknown
Little

1510
Unknown
0,32
Some

1554
Unknown
Unknown
Little

1597
6 mo.
0,24
Little

1636
12 mo.
0,08
Little

1693
7-12 mo.
0,03
Much

1725
Unknown
Unknown
Little

1766-68
24 mo.
1,7
Some

1845-46
7 mo.
1,0
Some

1878
Unknown
Unknown
Little

1913
4-5 mo.
Unknown
Little

1947-48
13 mo.
1,0
Some

1970
2 mo.
0,3
Little

1980-81
2 weeks
0,25
Some

1991
2 mo.
0,15
Little

2000
11 days
0,11
Little

The quiet (or repose) period between Hekla's eruptions has ranged from 16 years to 121 years. A tendency toward longer repose intervals has occurred between the later eruptions.

Eruptions in Hekla are extremely varied and difficult to predict . Some are very short (a week to ten days) whereas others can stretch into months and years (the 1947 eruption started March 29, 1947 and ended April 1948).

Over the past 7000 years Hekla has had five big fissure eruptions. The biggest eruptions were 4000 and 2800 years ago. Traces of these two eruptions can be found in the soil in the North and the North-East of Iceland. The biggest layer of tephra from one eruption fell in the eruption 2800 years ago. It covers about 80% of the country and its volume was around 12 cubic km. Traces of it has been found in various places in Scandinavia.
[link to iceland.vefur.is]

add for El Hierro

as clearly seen from these maps and data
[link to volcans.blogs-de-voyage.fr]
[link to www.emsc-csem.org]
[link to www.emsc-csem.org]

now depth epicenters have now some trend to increase (from 12-14 to 16-20 km)
now epicenters migrated to the general trend in the south
the depth of the ocean in their locations are isobaths between 1500 - 3000 meters (not significantly change on the path of migration)

last hours weak trend of migration in direction to shore,
still depths of epicenters mainly about 18-20 km and locations between isobaths 2000 - 3000 meters

must read!